Concept of Operations (ConOps) — ISO/IEC/IEEE 15289 — Description | IEEE 29148 §6.1
Generated 2026-03-27 — UHT Journal / universalhex.org
The Remote Weapon Station exists to enable armored vehicle crews to detect, identify, and engage threats with direct-fire weapons while remaining under ballistic protection. Without an RWS, crew members must expose themselves through open hatches to operate vehicle-mounted weapons — the leading cause of upper-body casualties in mounted operations. The RWS eliminates this exposure by providing stabilized electro-optical sensors and a remotely controlled weapon mount operated from inside the vehicle. The operational need is driven by the shift to urban and asymmetric warfare where threats are omnidirectional, engagement ranges are short, and the time from detection to engagement determines survivability.
| Stakeholder | Relationship | Hex Code |
|---|---|---|
| Dismounted Infantry | Personnel at risk from turret motion and weapon discharge. Safety-critical stakeholder. Derived from urban patrol and emergency scenarios. | — |
| Weapons System Maintainer | Performs preventive/corrective maintenance in turret hazard zone. Requires lockout-tagout safety. Derived from maintenance scenario. | 00843AF9 |
| Vehicle Crew (Driver/Loader) | Affected by recoil, vibration, noise. Loader replenishes ammunition and clears stoppages. Derived from patrol and maintenance scenarios. | — |
| Vehicle Commander (RWS Operator) | Primary operator, acquires targets and controls weapon from inside vehicle. Derived from all ConOps scenarios. | 008578F9 |
| Tactical Commander | Authorises engagement per ROE, receives sensor imagery via data link. Derived from urban patrol scenario. | — |
| RWS System Integrator (OEM) | Designs, manufactures, integrates, and supports through life. Responsible for safety case and certification. | 40853879 |
| Mode | Description |
|---|---|
| Stowed/Travel | Vehicle movement or system powered-down → turret mechanically locked, weapon stowed and safed, FCS powered off, only vehicle CAN heartbeat monitored → exits on operator power-up command and successful BIT completion |
| Surveillance | Operator selects surveillance after BIT pass → sensors active (EO/TI), turret traversable, weapon safed and not armed, auto-scan patterns available, target detection and tracking active, sensor recording enabled → exits to Engagement on operator ARM command with authorization, or to Stowed on operator STOW command |
| Engagement | Operator ARMs weapon with two-action authorization → weapon loaded, fire control solution computed, laser rangefinder active, ballistic correction applied, trigger enabled → exits to Surveillance on operator SAFE command, to Emergency Stop on E-STOP or safety interlock trip, or to Degraded if FCS/sensor fault detected |
| Degraded Operation | Sensor failure, partial servo fault, or FCS degradation detected by BIT → system continues with reduced capability (e.g., manual tracking if auto-tracker fails, EO-only if TI fails), operator alerted with specific fault code, weapon may remain armed if safety-critical functions unaffected → exits to Surveillance on fault clearance, to Emergency Stop if safety function lost |
| Emergency Stop | E-STOP button pressed, safety interlock tripped, uncommanded motion detected, or loss of operator control link → weapon immediately safed (firing circuit interrupted), turret drive power removed, mechanical brake engaged within 500ms, all actuators de-energized → exits only on operator deliberate reset sequence after fault investigation |
| Maintenance | Operator initiates maintenance mode with weapon confirmed clear → weapon safed, turret power reduced to manual slew only, safety interlocks enforced (no traverse past maintenance limits), ammunition feed disconnected, access panels unlocked → exits to Stowed/Travel on maintenance complete confirmation and panel close |
| Initialization/BIT | Vehicle power applied to RWS → system energizes in safe state (weapon safed, turret locked), runs self-diagnostics on servos, sensors, FCS, safety interlocks, ammunition feed; servo drives exercised for encoder calibration; LRF internal reference test; BIT duration 30-90s depending on temperature → exits to Surveillance if all safety-critical checks pass, remains in BIT with fault display if any check fails |
| Boresight/Calibration | Operator initiates from Surveillance with weapon safed, vehicle stable → automated low-speed turret slew aligns EO/TI boresight to weapon bore axis using calibration target at known range, LRF range calibrated, gyro/IMU drift corrected; triggered after maintenance, barrel change, or BIT-detected misalignment >0.5 mrad → exits to Surveillance on successful alignment confirmation |
IED damages cable harness, control link lost, hardware safety auto-safes weapon within 500ms, crew secures manually, RWS degraded-out, field maintenance required
Thermal crossover at 1400hrs renders TI ineffective, BIT alerts operator, falls back to day camera with manual tracking, reduced accuracy but functional, crew adjusts patrol timing
VC conducts mounted urban patrol, detects RPG threat on rooftop via thermal, confirms with day camera, receives authorization, arms weapon, auto-tracks, fires 3-round burst at 200m, returns to surveillance
After 500+ rounds, crew withdraws, initiates maintenance mode, clears weapon, armourer changes barrel (15 min), inspects feed, reloads, BIT passes, returns to stowed
Turret traverses past commanded bearing, operator E-STOPs, drives de-energised and braked within 200ms, azimuth encoder fault found, LRU replacement, BIT confirms fix
| Category | Constraint |
|---|---|
| Ingress Protection | IP67 minimum for turret assembly (dust-tight, temporary immersion for fording), IP54 for hull-mounted electronics |
| EMC/EMI | MIL-STD-461G RE102/RS103, vehicle-level EMC per DEF STAN 59-411, operation near radio transmitters and ECM |
| Safety Standards | IEC 61508 (Functional safety of E/E/PE safety-related systems) SIL 2-3 for weapon firing chain, DEF STAN 00-56 (Safety Management Requirements for Defence Systems) |
| Vibration | MIL-STD-810H Method 514.8 Cat 4 (wheeled vehicle) and Cat 8 (tracked vehicle), 5-500Hz |
| Temperature | Operating -46°C to +71°C per MIL-STD-810H Method 501.7/502.7, storage -51°C to +85°C |
| System | Interface | Hex Code |
|---|---|---|
| GPS/Navigation System | RS-422 or CAN-bus, NMEA-0183 or military GPS format, <10m CEP for ballistic computation | 54E57019 |
| Host Vehicle Platform | 28VDC power, CAN-bus data, NATO turret ring mechanical mount, 25kN recoil load structural interface | DE851019 |
| Ammunition Supply System | Mechanical belt feed, ammunition type sensor, round counter, STANAG 4090 compatible, 200-400 round magazine | 44853859 |
| Tactical Data Link (BMS) | MIL-STD-6016 or national BMS protocol, target handoff, blue force tracking, sensor imagery export via UHF/VHF | — |
flowchart TB n0["system<br>Remote Weapon Station (RWS)"] n1["actor<br>Vehicle Commander"] n2["actor<br>Dismounted Infantry"] n3["external<br>Host Vehicle Platform"] n4["external<br>Tactical Data Link"] n5["external<br>Ammunition Supply"] n6["external<br>GPS/Navigation"] n7["actor<br>Weapons Maintainer"] n1 -->|Commands, target designation| n0 n0 -->|Sensor video, weapon status, BIT| n1 n3 -->|28VDC power, CAN-bus, mounting| n0 n0 -->|Sensor imagery, engagement data| n4 n4 -->|Target handoff, BFT, ROE| n0 n5 -->|Belted ammunition feed| n0 n6 -->|Position, heading| n0 n7 -->|Maintenance, diagnostics| n0 n0 -->|Fire support, hazard zone| n2
Remote Weapon Station — Context