System Requirements Specification (SyRS) — ISO/IEC/IEEE 15289 — Specification | IEEE 29148 §6.2–6.4
Generated 2026-03-27 — UHT Journal / universalhex.org
| Acronym | Expansion |
|---|---|
| ARC | Architecture Decisions |
| CCCS | Completeness, Consistency, Correctness, Stability |
| EARS | Easy Approach to Requirements Syntax |
| IFC | Interface Requirements |
| RMAP | Remote Memory Access Protocol |
| STK | Stakeholder Requirements |
| SUB | Subsystem Requirements |
| SYS | System Requirements |
| UHT | Universal Hex Taxonomy |
| VER | Verification Plan |
| Ref | Requirement | V&V | Tags |
|---|---|---|---|
| STK-STAKEHOLDERNEEDS-001 | 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. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-002 | The Earth Observation Satellite shall downlink acquired imagery to designated ground stations within 24 hours of acquisition to enable timely analysis. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-003 | The Earth Observation Satellite shall operate autonomously in low Earth orbit for a minimum mission lifetime of 7 years without requiring on-orbit servicing. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-004 | The Earth Observation Satellite shall comply with applicable space debris mitigation guidelines, including controlled deorbiting within 25 years of end of mission. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-005 | The Earth Observation Satellite shall maintain pointing accuracy sufficient to geolocate acquired imagery to within 50 metres without ground control points. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-006 | The Earth Observation Satellite shall be compatible with existing ground segment infrastructure and data distribution standards used by the operating agency. | — | stakeholder, session-176 |
| STK-STAKEHOLDERNEEDS-007 | The Earth Observation Satellite shall survive and recover from single-event upsets and transient radiation effects encountered in the LEO radiation environment. | — | stakeholder, session-176 |
| Ref | Requirement | V&V | Tags |
|---|---|---|---|
| SYS-SYSTEM-LEVELREQUIREMENTS-001 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-002 | The Optical Payload Subsystem SHALL achieve a ground sampling distance of 10 metres or better at nadir from the operational orbit altitude. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-003 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-004 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-005 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-006 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-007 | The Attitude and Orbit Control Subsystem SHALL maintain pointing knowledge accuracy of 0.01 degrees (3-sigma) in all three axes during imaging operations. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-008 | The Attitude and Orbit Control Subsystem SHALL achieve pointing stability of 0.001 degrees per second (3-sigma) during payload data acquisition. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-009 | The Telemetry Tracking and Command Subsystem SHALL implement CCSDS packet telemetry and telecommand standards for all ground-to-space and space-to-ground communications. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-010 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-011 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-012 | 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. | — | system, session-176 |
| SYS-SYSTEM-LEVELREQUIREMENTS-013 | 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. | — | system, structure-mechanisms, session-184 |
| SYS-SYSTEM-LEVELREQUIREMENTS-014 | 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. | — | system, structure-mechanisms, session-184 |
| SYS-SYSTEM-LEVELREQUIREMENTS-015 | 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. | — | system, propulsion, session-184 |
| Source | Target | Type | Description |
|---|---|---|---|
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-013 | derives | |
| STK-STAKEHOLDERNEEDS-004 | SYS-SYSTEM-LEVELREQUIREMENTS-015 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-014 | derives | |
| STK-STAKEHOLDERNEEDS-001 | SYS-SYSTEM-LEVELREQUIREMENTS-001 | derives | |
| STK-STAKEHOLDERNEEDS-007 | SYS-SYSTEM-LEVELREQUIREMENTS-010 | derives | |
| STK-STAKEHOLDERNEEDS-007 | SYS-SYSTEM-LEVELREQUIREMENTS-005 | derives | |
| STK-STAKEHOLDERNEEDS-006 | SYS-SYSTEM-LEVELREQUIREMENTS-009 | derives | |
| STK-STAKEHOLDERNEEDS-006 | SYS-SYSTEM-LEVELREQUIREMENTS-003 | derives | |
| STK-STAKEHOLDERNEEDS-005 | SYS-SYSTEM-LEVELREQUIREMENTS-008 | derives | |
| STK-STAKEHOLDERNEEDS-005 | SYS-SYSTEM-LEVELREQUIREMENTS-007 | derives | |
| STK-STAKEHOLDERNEEDS-004 | SYS-SYSTEM-LEVELREQUIREMENTS-006 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-011 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-006 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-004 | derives | |
| STK-STAKEHOLDERNEEDS-002 | SYS-SYSTEM-LEVELREQUIREMENTS-009 | derives | |
| STK-STAKEHOLDERNEEDS-002 | SYS-SYSTEM-LEVELREQUIREMENTS-003 | derives | |
| STK-STAKEHOLDERNEEDS-001 | SYS-SYSTEM-LEVELREQUIREMENTS-002 | derives | |
| STK-STAKEHOLDERNEEDS-001 | SYS-SYSTEM-LEVELREQUIREMENTS-001 | derives | |
| STK-STAKEHOLDERNEEDS-002 | SYS-SYSTEM-LEVELREQUIREMENTS-012 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-011 | derives | |
| STK-STAKEHOLDERNEEDS-007 | SYS-SYSTEM-LEVELREQUIREMENTS-010 | derives | |
| STK-STAKEHOLDERNEEDS-006 | SYS-SYSTEM-LEVELREQUIREMENTS-009 | derives | |
| STK-STAKEHOLDERNEEDS-005 | SYS-SYSTEM-LEVELREQUIREMENTS-008 | derives | |
| STK-STAKEHOLDERNEEDS-005 | SYS-SYSTEM-LEVELREQUIREMENTS-007 | derives | |
| STK-STAKEHOLDERNEEDS-004 | SYS-SYSTEM-LEVELREQUIREMENTS-006 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-005 | derives | |
| STK-STAKEHOLDERNEEDS-003 | SYS-SYSTEM-LEVELREQUIREMENTS-004 | derives | |
| STK-STAKEHOLDERNEEDS-002 | SYS-SYSTEM-LEVELREQUIREMENTS-003 | derives | |
| STK-STAKEHOLDERNEEDS-001 | SYS-SYSTEM-LEVELREQUIREMENTS-002 | derives | |
| STK-STAKEHOLDERNEEDS-001 | SYS-SYSTEM-LEVELREQUIREMENTS-001 | derives |