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      <SPEC-OBJECTS>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-001">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Propulsion Subsystem SHALL use a monopropellant hydrazine blowdown system rather than bipropellant or electric propulsion. Rationale: hydrazine blowdown provides the simplest architecture for the 150 m/s delta-V budget, avoids oxidiser handling complexity, and offers heritage from ESA LEO missions. Electric propulsion was rejected due to the long thrust durations conflicting with imaging duty cycle requirements.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-002">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Subsystem SHALL employ SpaceWire (ECSS-E-ST-50-12C) as the primary high-speed data bus interconnecting payload, mass memory, and platform subsystems. Rationale: SpaceWire provides deterministic latency, time-code distribution, and sufficient bandwidth (200 Mbps per link) for the 800 Mbps aggregate payload data rate when parallelised. MIL-STD-1553B was rejected for insufficient bandwidth; Ethernet-based alternatives lack sufficient spaceflight heritage for this mission class.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-003">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Telemetry Tracking and Command Subsystem SHALL implement a dual-band architecture using S-band for telecommand uplink and housekeeping telemetry, and X-band for high-rate payload data downlink. Rationale: S-band provides reliable, near-omnidirectional coverage for commanding in all spacecraft attitudes including safe mode. X-band enables the 800 Mbps downlink rate required to empty the 2 Tbit mass memory within available ground station contact windows (typically 10 minutes per pass at 700 km altitude). A single-band approach cannot satisfy both the robust commanding and high-throughput data delivery requirements simultaneously.">
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-004">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thermal Control Subsystem SHALL use a pulse-tube cryocooler with a deployable radiator to cool the SWIR focal plane array, rather than passive radiative cooling or Stirling-cycle coolers. Rationale: the 150 K operating temperature required by the HgCdTe SWIR detector at 700 km sun-synchronous orbit cannot be reliably achieved by passive radiators alone due to Earth albedo and infrared flux. Pulse-tube cryocoolers provide vibration-free operation essential for sub-arcsecond pointing stability, unlike Stirling coolers which export significant mechanical disturbance at the drive frequency.">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:ARC-ARCHITECTUREDECISIONS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-005">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Subsystem SHALL employ a centralised radiation-hardened onboard computer with distributed remote terminal units for subsystem I/O acquisition, rather than a federated processing architecture. Rationale: a centralised OBC simplifies FDIR implementation and software qualification. Remote terminal units provide analogue and discrete I/O at each subsystem, reducing harness mass and EMI by keeping analogue signals short. The 400 MIPS processing budget is sufficient for all platform management tasks when payload image processing is handled by a dedicated IPU within the Optical Payload Subsystem.">
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        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-006">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Attitude and Orbit Control Subsystem SHALL use a four-wheel reaction wheel assembly in a tetrahedral configuration with magnetorquer-based momentum unloading, rather than control moment gyroscopes or thruster-based attitude control. Rationale: reaction wheels provide the sub-arcsecond pointing stability and 0.001 deg/s stability required for 10 m GSD imaging. Magnetorquer unloading avoids propellant consumption for routine momentum management, preserving the hydrazine budget for orbit maintenance. CMGs were rejected as oversized for this satellite class. The tetrahedral four-wheel geometry provides single-fault tolerance against any one wheel failure.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="ARC-ARCHITECTUREDECISIONS-007">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-001" LAST-CHANGE="2026-04-24T20:22:59.816Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-001">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-002" LAST-CHANGE="2026-04-24T20:22:59.816Z">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-002">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Focal Plane Array and Image Processing Unit SHALL use LVDS differential signalling at a data rate of 1.2 Gbps per channel with a maximum of 4 parallel channels.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-003">
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        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-004" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-004">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between Calibration System and Focal Plane Array SHALL provide a uniform illumination field with spatial non-uniformity of less than 1% across the detector active area during calibration sequences.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; optical-payload; session-177">
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        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-005">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Star Tracker Assembly and the AOCS Flight Software SHALL use a MIL-STD-1553B data bus transmitting attitude quaternion packets at 10 Hz with a maximum latency of 5 milliseconds from measurement to availability in the Kalman filter.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; aocs; session-178">
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      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-006" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-006">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the AOCS Flight Software and the Reaction Wheel Assembly SHALL transmit torque command vectors at a minimum rate of 20 Hz via a CAN bus interface with command resolution of 0.001 Nm.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; aocs; session-178">
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          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-007" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the GNSS Receiver and the Onboard Data Handling Subsystem SHALL provide a 1 PPS timing pulse with accuracy better than 100 ns and a serial NMEA/proprietary message stream at 1 Hz carrying position, velocity, and time data.">
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-008" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-008">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Solar Array Assembly and the Power Control and Distribution Unit SHALL transfer unregulated DC power via redundant harness pairs rated for a maximum current of 40 A per string at voltages ranging from 60 V to 120 V across the full solar array operating temperature range of -150 C to +110 C.">
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          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; eps; session-179">
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        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
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      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-009" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Battery Assembly and the Power Control and Distribution Unit SHALL support bidirectional current flow of up to 30 A charge and 50 A discharge via a dedicated battery bus with continuous battery voltage, current, and temperature telemetry sampled at a minimum rate of 1 Hz.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-010" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Power Management Software and the Onboard Data Handling Subsystem SHALL use the spacecraft MIL-STD-1553B data bus for exchange of power telemetry packets, load shedding commands, and battery state of health parameters at a minimum update rate of 1 Hz.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-011" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Onboard Computer and the SpaceWire Network Router SHALL use ECSS-E-ST-50-12C SpaceWire protocol at 200 Mbps link rate with RMAP (Remote Memory Access Protocol) for register-level access to all connected nodes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-012" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the SpaceWire Network Router and the Mass Memory Unit SHALL support sustained bulk data transfer at 800 Mbps using SpaceWire packet protocol with hardware flow control to prevent buffer overrun during continuous payload recording.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-013" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the SpaceWire Network Router and each Remote Terminal Unit SHALL operate at a minimum link rate of 10 Mbps using SpaceWire packet protocol, with each RTU addressable via a unique logical address for targeted housekeeping queries and command relay.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-014" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the S-Band Antenna Assembly and the S-Band Transponder SHALL use 50-ohm coaxial connections with SMA connectors, supporting the full 2025-2290 MHz band with insertion loss below 0.5 dB and VSWR below 1.3:1.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-015" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the S-Band Transponder and the Baseband Data Processor SHALL use a synchronous serial link at 1 Mbps for TM/TC baseband data exchange, with CCSDS transfer frame boundaries delimited by attached sync markers.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-016" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Baseband Data Processor and the X-Band Transmitter SHALL use parallel LVDS signalling at a clock rate matching the selected symbol rate, with frame-aligned data valid assertion to synchronise modulator acquisition.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-017" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the X-Band Transmitter and the X-Band High-Gain Antenna SHALL use WR-112 rectangular waveguide with a maximum insertion loss of 0.3 dB across the 8.025-8.4 GHz band.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-018" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Baseband Data Processor and the Mass Memory Unit SHALL use SpaceWire operating at 200 MHz link speed, supporting sustained payload data readout at 800 Mbps via dual redundant links with automatic failover.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-019" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the S-Band Transponder and the Onboard Computer SHALL use SpaceWire for telecommand packet delivery and telemetry source packet collection, with command latency from RF reception to OBDH delivery below 50 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-020" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Onboard Computer and the X-Band High-Gain Antenna gimbal controller SHALL use a CAN bus at 1 Mbps for antenna pointing commands, providing target azimuth and elevation angles at a minimum update rate of 10 Hz during ground station passes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-021" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Pulse-Tube Cryocooler and the Focal Plane Array SHALL use a flexible copper thermal strap with a conductance of at least 0.5 W/K to thermally isolate cryocooler vibrations from the detector mount.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-022" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Thermostatically Controlled Heater System and the Power Control and Distribution Unit SHALL draw a maximum of 180 W from the unregulated 28 V bus for survival heaters during eclipse.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-023" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Deployable Cryocooler Radiator and the Pulse-Tube Cryocooler SHALL use two flexible loop heat pipes with ammonia working fluid, each capable of transporting 50 W over a 1 m length.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-024" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-024">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Heat Pipe Network and equipment mounting panels SHALL provide mechanical mounting provisions for at least 14 constant-conductance and 4 variable-conductance heat pipes with a total transport capacity exceeding 400 W.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-025" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-025">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Launch Vehicle Adapter and the Primary Structure SHALL be a 1194 mm diameter bolt-circle with 24 M8 titanium bolts providing a minimum axial load capacity of 200 kN and a lateral load capacity of 75 kN.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-026" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-026">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Antenna Deployment Boom and the X-Band High-Gain Antenna gimbal SHALL provide a mechanical mounting flange with three-axis alignment accuracy of 0.1 degrees and a harness feedthrough for gimbal motor power and encoder signals.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-027" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-027">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Solar Array Deployment Mechanism and the Remote Terminal Unit SHALL provide discrete telemetry signals indicating hold-down status (stowed/released) and deployment latch engagement for each wing via redundant micro-switches.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-028" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-028">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Thruster Assembly and the AOCS Flight Software SHALL provide thruster on/off commanding via discrete pulse signals with a minimum pulse width of 20 ms and a maximum command latency of 10 ms from AOCS command issue to valve actuation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-029" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-029">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Propellant Management Assembly and the Remote Terminal Unit SHALL provide analog telemetry of tank pressure (0-30 bar, 0.25% FSO accuracy), latch valve position status, and catalyst bed temperature for each thruster pair.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:IFC-INTERFACEDEFINITIONS-030" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="IFC-INTERFACEDEFINITIONS-030">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The interface between the Propellant Tank and the Primary Structure SHALL provide a mounting bracket capable of supporting the filled tank mass of 53 kg under 8g axial and 3g lateral loads with thermal isolation standoffs limiting heat leak to less than 2 W.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="interface; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-001" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-001">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall acquire multispectral imagery of the Earth's surface with sufficient spatial resolution to support land use classification, vegetation monitoring, and disaster response.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
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          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-002" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-002">
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          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall downlink acquired imagery to designated ground stations within 24 hours of acquisition to enable timely analysis.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-003" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall operate autonomously in low Earth orbit for a minimum mission lifetime of 7 years without requiring on-orbit servicing.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-004" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall comply with applicable space debris mitigation guidelines, including controlled deorbiting within 25 years of end of mission.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall maintain pointing accuracy sufficient to geolocate acquired imagery to within 50 metres without ground control points.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-006" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall be compatible with existing ground segment infrastructure and data distribution standards used by the operating agency.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:STK-STAKEHOLDERNEEDS-007" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="STK-STAKEHOLDERNEEDS-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Earth Observation Satellite shall survive and recover from single-event upsets and transient radiation effects encountered in the LEO radiation environment.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="stakeholder; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-001" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Telescope Assembly SHALL provide a clear aperture diameter of not less than 500 mm with a Korsch three-mirror anastigmat design to achieve the required ground sampling distance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-002" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Focal Plane Array SHALL provide detector elements covering visible (450-690 nm), near-infrared (760-900 nm), and shortwave infrared (1550-1750 nm) spectral bands with quantum efficiency exceeding 0.6 in each band.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-003" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="While imaging, the Focal Plane Array SWIR detectors SHALL be maintained at an operating temperature of 150 K or below by the integrated cryocooler to achieve the required signal-to-noise ratio.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-004" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Image Processing Unit SHALL implement CCSDS 122.0 lossless compression achieving a compression ratio of at least 2:1 for all spectral bands without loss of radiometric fidelity.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Image Processing Unit SHALL process and format payload data at a sustained throughput of at least 1.2 Gbps to prevent data loss during continuous imaging passes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-006" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Spectral Filter Mechanism SHALL achieve out-of-band rejection of at least 10^-4 for each spectral channel to prevent cross-band contamination of image data.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-007" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Spectral Filter Mechanism SHALL complete band selection transitions in less than 200 milliseconds to support multi-band imaging within a single ground track pass.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-008" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Calibration System SHALL provide absolute radiometric calibration accuracy of 5% or better traceable to SI standards across all spectral bands over the full mission lifetime.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-009" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="While in imaging mode, the Telescope Assembly SHALL maintain primary-to-secondary mirror alignment within 5 micrometres to preserve modulation transfer function performance across the full field of view.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-010" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Star Tracker Assembly SHALL determine inertial attitude with an accuracy of 3 arcseconds (3-sigma) per axis across the full celestial sphere, excluding zones within 20 degrees of the Sun.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-011" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Reaction Wheel Assembly SHALL provide a total angular momentum storage capacity of at least 50 Nms per axis in a four-wheel redundant tetrahedral configuration to support agile imaging slew manoeuvres of 30 degrees in under 60 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-012" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Magnetorquer System SHALL generate a magnetic dipole moment of at least 30 Am2 per axis to desaturate the Reaction Wheel Assembly from 80% stored momentum to below 20% within one orbit period at any orbital inclination.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-013" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The GNSS Receiver SHALL provide autonomous orbit position determination with accuracy better than 10 metres (3-sigma) and velocity determination better than 0.1 m/s (3-sigma) using dual-frequency GPS/Galileo L1/L5 signals.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-014" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The AOCS Flight Software SHALL implement an extended Kalman filter fusing star tracker, GNSS, and magnetometer measurements to provide filtered attitude knowledge with accuracy better than 0.005 degrees (3-sigma) per axis at a minimum update rate of 10 Hz.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-015" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a fault is detected by the AOCS Flight Software, the AOCS shall autonomously transition from any operational mode to safe mode within 10 seconds while maintaining Sun-pointing attitude to preserve positive power balance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-016" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="While in imaging mode, the Reaction Wheel Assembly SHALL limit micro-vibration disturbance torque to below 10 mNm amplitude at frequencies above 1 Hz to prevent image smear in the Optical Payload Subsystem.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-017" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The GNSS Receiver SHALL provide a UTC time reference with accuracy better than 100 nanoseconds (1-sigma) to the Onboard Data Handling Subsystem for payload image time-stamping and orbit event synchronisation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-018" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array Assembly SHALL generate a minimum beginning-of-life power of 3200 W under AM0 illumination at normal incidence to ensure 2500 W end-of-life orbital average power after accounting for cell degradation, cosine losses, and eclipse fraction over a 7-year mission.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-019" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Battery Assembly SHALL provide a minimum usable energy storage capacity of 1500 Wh at end-of-life to sustain all essential spacecraft loads during a maximum eclipse duration of 35 minutes without bus voltage excursion below 26 V.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-020" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Control and Distribution Unit SHALL regulate the primary power bus to 28 V +/- 2 V under all load conditions from minimum keep-alive to peak imaging power, including load transients of up to 500 W step change.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-021" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array Drive Mechanism SHALL track the Sun with a pointing accuracy of 1 degree or better about the rotation axis throughout the sunlit portion of each orbit to maintain solar array power output within 2% of the maximum achievable.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-022" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the battery state of charge falls below 30%, the Power Management Software SHALL autonomously execute load shedding of non-essential loads within 500 milliseconds in a priority sequence defined by the ground-configurable load priority table.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-023" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Battery Assembly SHALL sustain a minimum of 60000 charge-discharge cycles at a depth of discharge not exceeding 25% with capacity fade of less than 20% from beginning-of-life rated capacity over the 7-year mission duration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-024" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-024">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Control and Distribution Unit SHALL implement maximum power point tracking with an efficiency of 97% or better across the full solar array voltage range from beginning-of-life cold to end-of-life hot operating conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-025" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-025">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the spacecraft enters safe mode, the Power Management Software SHALL configure the Electrical Power Subsystem to maintain positive power balance by shedding all payload loads and non-essential platform loads within 2 seconds while preserving Sun-pointing attitude control power.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-026" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-026">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Computer SHALL employ a radiation-hardened processor with a minimum computational throughput of 400 MIPS and 256 MB of EDAC-protected SRAM to support concurrent execution of FDIR, command processing, and telemetry formatting tasks.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-027" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-027">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Mass Memory Unit SHALL provide a minimum of 2 Tbit usable storage capacity using NAND flash with triple-module redundancy error correction achieving a bit error rate below 10^-15 after correction.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-028" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-028">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The SpaceWire Network Router SHALL provide at least 8 bidirectional SpaceWire ports operating at a link rate of 200 Mbps per port with deterministic latency not exceeding 5 microseconds per hop.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-029" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-029">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Mass Memory Unit SHALL support simultaneous write from the payload data stream and read for downlink at a sustained aggregate throughput of 1.5 Gbps without data loss or write-stall conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-030" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-030">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Software SHALL implement autonomous fault detection, isolation, and recovery covering at minimum single-event upsets, processor watchdog timeout, memory parity errors, and SpaceWire link failures, with fault detection latency not exceeding 500 milliseconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-031" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-031">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Remote Terminal Unit SHALL acquire analog sensor measurements with 16-bit resolution and absolute accuracy of 0.1% of full scale, sampling at least 100 channels at a minimum rate of 1 Hz for housekeeping telemetry collection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-032" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-032">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a telecommand is received, the Onboard Data Handling Software SHALL validate command authentication, sequence count, and parameter range within 100 milliseconds and reject commands failing any validation check with a rejection telemetry report.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-033" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-033">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The SpaceWire Network Router SHALL distribute time-code ticks synchronised to the GNSS-derived UTC reference with a maximum jitter of 1 microsecond to all connected subsystem nodes for correlation of payload and housekeeping timestamps.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-034" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-034">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Transponder SHALL receive telecommands at data rates up to 64 kbps on the 2025-2110 MHz uplink band and transmit telemetry at data rates up to 512 kbps on the 2200-2290 MHz downlink band, with a minimum receiver sensitivity of -110 dBm.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-035" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-035">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Transponder SHALL support coherent turnaround mode with a transponder ratio of 240/221 to enable two-way Doppler range-rate measurements with an accuracy better than 0.1 mm/s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-036" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-036">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band Transmitter SHALL deliver a minimum RF output power of 8 W at the antenna port across the 8.025-8.4 GHz downlink band, supporting selectable data rates of 150, 300, 450, 600, and 800 Mbps with OQPSK modulation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-037" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-037">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band Transmitter SHALL achieve a power-added efficiency of not less than 25% at the rated 8 W output, with total DC power consumption not exceeding 50 W in transmit mode.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-038" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-038">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Baseband Data Processor SHALL implement CCSDS AOS transfer frame assembly with virtual channel multiplexing supporting at least 8 virtual channels, and SHALL apply concatenated Reed-Solomon (223,255) and convolutional (rate 1/2, K=7) forward error correction coding for X-band downlink.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-039" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-039">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Baseband Data Processor SHALL sustain a continuous throughput of 800 Mbps from the Mass Memory Unit to the X-Band Transmitter without frame loss during ground station passes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-040" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-040">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band High-Gain Antenna SHALL provide a minimum gain of 34 dBi at 8.2 GHz with a two-axis gimbal mechanism enabling ±90 degree steering in both azimuth and elevation to track ground stations during LEO passes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-041" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-041">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band High-Gain Antenna gimbal SHALL achieve a pointing accuracy better than 0.3 degrees and a slew rate of at least 2 degrees per second to maintain link margin during overhead passes with angular rates up to 1 degree per second.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-042" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-042">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Antenna Assembly SHALL provide near-omnidirectional coverage with a minimum gain of -3 dBi over at least 95% of the sphere surrounding the spacecraft to ensure telecommand reception and telemetry transmission in any attitude.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-043" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-043">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When the onboard schedule initiates a ground station pass, the Baseband Data Processor SHALL prioritise real-time imaging data replay over deferred housekeeping data, ensuring that the highest-priority virtual channel occupies at least 80% of the available downlink bandwidth.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-044" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-044">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="While the spacecraft is in safe mode, the S-Band Transponder SHALL remain operational on low-power mode with telemetry transmission at a minimum rate of 4 kbps to support anomaly diagnosis from the ground.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-045" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-045">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Transponder SHALL implement CCSDS Proximity-1 compatible command authentication to reject unauthorized telecommands with a false-acceptance probability below 10^-16 per command.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-046" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-046">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Pulse-Tube Cryocooler SHALL maintain the SWIR focal plane array cold-finger temperature at 150 K ±2 K throughout the orbital cycle, including during eclipse transient conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-047" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-047">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thermostatically Controlled Heater System SHALL maintain battery pack temperature above 0°C and propellant line temperature above 5°C during eclipse and safe-mode conditions without OBC intervention.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-048" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-048">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Optical Solar Reflector Radiator Panels SHALL reject a minimum of 600 W orbit-average heat load while maintaining panel equilibrium temperature below 20°C at end-of-life solar absorptance.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-049" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-049">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Heat Pipe Network SHALL limit equipment panel temperature gradients to less than 5°C across any 0.5 m span under maximum internal dissipation conditions.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-050" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-050">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Deployable Cryocooler Radiator SHALL reject a minimum of 100 W at a panel equilibrium temperature of -40°C to provide adequate thermal margin for end-of-life cryocooler waste heat dissipation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-051" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-051">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Multi-Layer Insulation Blankets SHALL achieve an effective emittance of less than 0.03 over all covered external surfaces to limit parasitic heat leaks to below 50 W total.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-052" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-052">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="While the spacecraft is in safe mode, the Thermal Control Subsystem SHALL maintain all equipment within survival temperature limits using only survival heater circuits powered from the unregulated bus.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-053" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-053">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Pulse-Tube Cryocooler SHALL export vibration forces of less than 100 mN at the compressor drive frequency to prevent degradation of optical payload image quality.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-054" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-054">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Primary Structure SHALL maintain positive structural margins under combined quasi-static loads of 8g axial and 3g lateral with a factor of safety of 1.25 on yield and 1.5 on ultimate for all load-bearing members.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-055" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-055">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Primary Structure SHALL exhibit a first natural frequency above 25 Hz in the axial direction and above 10 Hz in the lateral direction in the stowed launch configuration.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-056" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-056">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array Deployment Mechanism SHALL deploy both solar array wings to the operational configuration within 120 seconds of receiving the deployment command, with deployment confirmation telemetry provided to the OBDH within 5 seconds of latch engagement.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-057" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-057">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Launch Vehicle Adapter SHALL achieve clean separation with tip-off rates below 1.0 deg/s in all axes and a relative separation velocity of 0.5 m/s plus or minus 0.1 m/s.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-058" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-058">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Antenna Deployment Boom SHALL exhibit a first deployed natural frequency above 5 Hz with the antenna payload mass of 3.2 kg at the tip, to avoid coupling with the AOCS control bandwidth.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-059" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-059">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Harness Assembly SHALL maintain a minimum separation of 50 mm between power, signal, and pyrotechnic harness routing paths and SHALL employ shielded connectors with EMI backshells on all data interfaces to limit conducted emissions below MIL-STD-461G CE102 limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-060" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-060">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array Deployment Mechanism hold-down and release system SHALL achieve a release reliability of at least 0.9999 per wing using redundant Frangibolt actuators with independent initiation circuits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-061" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-061">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thruster Assembly SHALL deliver a thrust of 0.9 N to 1.1 N per thruster over the blowdown pressure range of 22 bar to 5.5 bar with a specific impulse of at least 215 seconds.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-062" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-062">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thruster Assembly SHALL provide a minimum impulse bit of 50 mN-s or less to support fine orbit adjustment manoeuvres.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-063" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-063">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Propellant Tank SHALL store a minimum of 45 kg of hydrazine propellant with a MEOP of 24 bar and an expulsion efficiency of at least 98%.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-064" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-064">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="When a thruster firing is commanded, the catalyst bed heaters SHALL have maintained the catalyst bed temperature above 150 degrees Celsius for a minimum of 30 minutes prior to the first pulse to prevent cold-start degradation.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-065" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-065">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Propellant Management Assembly SHALL provide series-redundant propellant isolation via two normally-closed latch valves, each independently commandable, to prevent uncommanded propellant flow to the thrusters.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SUB-SUBSYSTEMREQUIREMENTS-066" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SUB-SUBSYSTEMREQUIREMENTS-066">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thruster Assembly SHALL be qualified for a minimum of 50000 pulses and 10 hours cumulative firing time without degradation in thrust or specific impulse below specification limits.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="subsystem; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-001" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Optical Payload Subsystem SHALL provide multispectral imaging in at least 4 spectral bands spanning visible (450-690 nm), near-infrared (760-900 nm), and shortwave infrared (1550-1750 nm) wavelengths.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-002" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Optical Payload Subsystem SHALL achieve a ground sampling distance of 10 metres or better at nadir from the operational orbit altitude.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-003" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Telemetry Tracking and Command Subsystem SHALL support a payload data downlink rate of at least 800 Mbps via X-band to enable full orbit data dump within available ground station contact windows.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-004" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Electrical Power Subsystem SHALL generate a minimum of 2500 W end-of-life orbital average power to sustain all subsystem operations over the 7-year mission lifetime.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Subsystem SHALL execute autonomous fault detection, isolation, and recovery procedures to maintain safe mode within 60 seconds of anomaly detection without ground intervention.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-006" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Attitude and Orbit Control Subsystem SHALL provide sufficient delta-V capacity for controlled deorbit at end of mission to achieve atmospheric re-entry within 5 years of decommissioning.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-007" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Attitude and Orbit Control Subsystem SHALL maintain pointing knowledge accuracy of 0.01 degrees (3-sigma) in all three axes during imaging operations.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-008" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Attitude and Orbit Control Subsystem SHALL achieve pointing stability of 0.001 degrees per second (3-sigma) during payload data acquisition.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-009" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Telemetry Tracking and Command Subsystem SHALL implement CCSDS packet telemetry and telecommand standards for all ground-to-space and space-to-ground communications.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-010" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Subsystem SHALL employ radiation-hardened or radiation-tolerant components rated to a minimum total ionising dose of 30 krad for all mission-critical processing elements.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-011" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Thermal Control Subsystem SHALL maintain all satellite components within their qualified operating temperature ranges throughout all orbital conditions including eclipse, sunlit, and safe mode.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-012" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Data Handling Subsystem SHALL provide a minimum of 2 Tbit solid-state mass memory capacity for storing payload data between ground station contacts.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; session-176">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-013" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Structure and Mechanisms Subsystem SHALL withstand quasi-static launch loads of 8g axial and 3g lateral with positive structural margins, maintain first natural frequencies above 25 Hz axial and 10 Hz lateral, and provide mounting interfaces for all satellite subsystems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-014" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Structure and Mechanisms Subsystem SHALL withstand quasi-static launch loads of 8g axial and 3g lateral with positive structural margins, maintain first natural frequencies above 25 Hz axial and 10 Hz lateral, and provide mounting interfaces for all satellite subsystems.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; structure-mechanisms; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:SYS-SYSTEM-LEVELREQUIREMENTS-015" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="SYS-SYSTEM-LEVELREQUIREMENTS-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Propulsion Subsystem SHALL provide a total delta-V capacity of at least 150 m/s for a 2000 kg satellite to support orbit maintenance manoeuvres and controlled deorbit within 25 years in compliance with IADC space debris mitigation guidelines.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="system; propulsion; session-184">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-001" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-001">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Telescope Assembly clear aperture and optical design SHALL be verified by inspection of manufacturing drawings and measurement of the as-built aperture diameter.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-002" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-002">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Focal Plane Array spectral response and quantum efficiency SHALL be verified by test using a calibrated monochromator source across each specified wavelength band at the component acceptance level.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-003" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-003">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Image Processing Unit compression performance SHALL be verified by test using representative scene data sets, confirming lossless reconstruction and achieved compression ratio.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; optical-payload; session-177">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-004" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-004">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Calibration System absolute radiometric accuracy SHALL be verified by analysis of pre-launch calibration data and comparison with ground-truth reference targets during the commissioning phase.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; optical-payload; session-177">
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          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-005" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-005">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Star Tracker Assembly accuracy requirement (SUB-SUBSYSTEMREQUIREMENTS-010) SHALL be verified by test using a star field simulator projecting known catalogue patterns onto the tracker optics and comparing output quaternions against truth data across the full operational temperature range.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-006" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-006">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Reaction Wheel Assembly micro-vibration requirement (SUB-SUBSYSTEMREQUIREMENTS-016) SHALL be verified by test using a dynamometric test bench measuring disturbance torque spectral density across the 0.1-500 Hz band at representative wheel speeds and confirming compliance against the image quality allocation budget.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-007" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-007">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The AOCS safe mode transition requirement (SUB-SUBSYSTEMREQUIREMENTS-015) SHALL be verified by analysis and test using a hardware-in-the-loop simulation injecting fault scenarios into each AOCS sensor and actuator channel and measuring the time from fault injection to stable Sun-pointing safe mode attitude.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; aocs; session-178">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-008" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-008">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array Assembly beginning-of-life power output SHALL be verified by test: illuminated I-V curve measurement of each solar panel wing under calibrated AM0 solar simulator conditions at the panel acceptance review, with margin analysis confirming 2500 W EOL orbital average.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-009" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-009">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Power Management Software autonomous load shedding response SHALL be verified by test: simulated battery SOC ramp-down on the EPS engineering model with measurement of load disconnection timing and sequence against the configurable load priority table, confirming response within 500 ms.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-010" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-010">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Solar Array to PCDU interface current and voltage characteristics SHALL be verified by test: end-to-end harness continuity and insulation resistance measurement followed by powered functional test across the full voltage range at qualification temperature extremes.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; eps; session-179">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-011" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-011">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Onboard Computer radiation hardness and computational throughput SHALL be verified by inspection of manufacturer datasheets for total ionising dose rating and by benchmark test executing representative flight software loads on the qualification unit.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-012" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-012">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Mass Memory Unit storage capacity and error correction performance SHALL be verified by test filling the complete memory with known data patterns, reading back with injected single-bit and double-bit errors, and confirming corrected readback accuracy.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-013" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-013">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The OBDH Software FDIR capability SHALL be verified by fault injection test on the software validation facility, injecting each fault type listed in the requirement and measuring detection latency against the 500 millisecond threshold.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; obdh; session-180">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-014" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-014">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Transponder receiver sensitivity and data rate performance (SUB-SUBSYSTEMREQUIREMENTS-034) SHALL be verified by test using a calibrated RF signal generator and bit error rate tester in an EMC-shielded chamber, measuring BER at the specified sensitivity threshold across the uplink band.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-015" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-015">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band Transmitter output power and modulation quality (SUB-SUBSYSTEMREQUIREMENTS-036) SHALL be verified by test using a spectrum analyser and power meter at the antenna port, measuring output power, spectral mask compliance, and EVM at each selectable data rate.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-016" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-016">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Baseband Data Processor throughput and FEC coding (SUB-SUBSYSTEMREQUIREMENTS-038, SUB-SUBSYSTEMREQUIREMENTS-039) SHALL be verified by test using a hardware-in-the-loop testbed with simulated SpaceWire payload data input at 800 Mbps, verifying zero frame loss over a 15-minute sustained transfer and correct Reed-Solomon and convolutional encoding by decoding the output with a reference CCSDS decoder.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-017" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-017">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The X-Band High-Gain Antenna gain and gimbal pointing accuracy (SUB-SUBSYSTEMREQUIREMENTS-040, SUB-SUBSYSTEMREQUIREMENTS-041) SHALL be verified by test in an antenna measurement range, measuring gain pattern at 8.2 GHz, and by test of the gimbal servo system using optical encoders to verify pointing accuracy and slew rate under simulated orbital pass dynamics.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-018" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-018">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band Antenna Assembly coverage requirement (SUB-SUBSYSTEMREQUIREMENTS-042) SHALL be verified by analysis of the antenna radiation pattern measured in an anechoic chamber, integrated with a spacecraft structural model to account for blockage, confirming minimum gain over 95% of the sphere.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-019" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-019">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The S-Band safe mode telemetry capability (SUB-SUBSYSTEMREQUIREMENTS-044) SHALL be verified by test during spacecraft-level thermal vacuum testing, transitioning to safe mode and confirming sustained 4 kbps telemetry transmission with the transponder on low-power settings and reduced bus voltage.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-020" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-020">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Baseband Data Processor to Mass Memory Unit SpaceWire interface (IFC-INTERFACEDEFINITIONS-018) SHALL be verified by test using protocol analysers on both SpaceWire links, confirming sustained 800 Mbps throughput with automatic failover to the redundant link within 100 ms of primary link fault injection.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; ttc; session-182">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-021" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-021">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The Pulse-Tube Cryocooler temperature stability (SUB-SUBSYSTEMREQUIREMENTS-046) SHALL be verified by test: operate cryocooler in thermal-vacuum chamber over simulated orbital thermal cycling for 48 hours, measuring cold-finger temperature with calibrated Cernox sensor at 1 Hz sampling.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-022" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-022">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The survival heater autonomous operation (SUB-SUBSYSTEMREQUIREMENTS-047) SHALL be verified by test: simulate OBC failure in thermal-vacuum, confirm heater controller maintains battery and propellant temperatures above limits using thermostat-only control for 3 consecutive eclipse cycles.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="verification; thermal-control; session-183">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-tags</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
        </VALUES>
        <TYPE><SPEC-OBJECT-TYPE-REF>req-type</SPEC-OBJECT-TYPE-REF></TYPE>
      </SPEC-OBJECT>
      <SPEC-OBJECT IDENTIFIER="uht-bot:se-earth-observation-satellite:VER-VERIFICATIONMETHODS-023" LAST-CHANGE="2026-04-24T20:22:59.816Z">
        <VALUES>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="VER-VERIFICATIONMETHODS-023">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-ref</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
          </ATTRIBUTE-VALUE-STRING>
          <ATTRIBUTE-VALUE-STRING THE-VALUE="The OSR radiator heat rejection capacity (SUB-SUBSYSTEMREQUIREMENTS-048) SHALL be verified by analysis: thermal mathematical model correlation to thermal-balance test data, demonstrating 600 W rejection at EOL absorptance with 10% margin.">
            <DEFINITION><ATTRIBUTE-DEFINITION-STRING-REF>attr-text</ATTRIBUTE-DEFINITION-STRING-REF></DEFINITION>
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