Overview
ISO 16615:2025 - "Space systems - Stable operation requirements for spacecraft attitude and orbit control system" defines criteria and best practices to ensure stable on‑orbit operation of a spacecraft’s Attitude and Orbit Control System (AOCS). The standard specifies principles for data validity, anomaly detection, software and hardware fault handling, safety boundary checks, and activation of emergency survival modes. It also defines the functional interface between on‑orbit autonomy and ground‑based maintenance, supporting reliable attitude and orbit control across spacecraft types.
Key topics and requirements
- Stable operation levels: Classifies operational states such as continuous operational service, degraded performance, and emergency transitional operation to guide response and recovery strategies.
- Data validity assessment: Requires systematic evaluation of telemetry and sensor data using status flags, validity ranges, continuity, dynamism, and consistency checks to avoid acting on corrupted or invalid inputs.
- Anomaly detection: Mandates component‑level and system‑level anomaly detection processes to identify deviations from expected behavior and trigger corrective actions.
- Fault handling: Specifies requirements for classifying and handling software faults and hardware faults, including management procedures to isolate, mitigate, or recover failed elements.
- Safety boundary checks: Defines checks to protect spacecraft structure, energy systems, and propellant limits, preventing operations that would endanger the vehicle.
- Emergency survival modes: Details activation and handling of survival modes (e.g., sun‑oriented safety mode, stop‑control safety mode) to preserve power, thermal balance, and mission-critical resources.
- Cybersecurity for AOCS: Covers encryption of telemetry, access control for ground systems, anomaly detection for cyber breaches, and requirements for updates and testing.
Applications and users
ISO 16615:2025 is intended for organizations involved in spacecraft design, integration, operations, and safety assurance, including:
- Satellite AOCS designers and system engineers
- Mission operations and ground segment teams
- Satellite manufacturers and integrators
- Space systems safety, reliability, and cybersecurity specialists
- Regulators and certification bodies assessing AOCS operational robustness
Practical uses include developing AOCS requirements, designing onboard autonomy and fault‑management logic, establishing ground‑control procedures, and preparing test plans for anomaly and emergency mode validation.
Related standards (if applicable)
- ISO 10795 (terminology referenced)
- ISO 14620‑1 (fault/failure terminology referenced)
- ISO/IEC Directives - editorial and development guidance
Keywords: ISO 16615, spacecraft AOCS, attitude and orbit control system, stable on‑orbit operation, anomaly detection, data validity, emergency survival mode, safety boundary checks, on‑orbit autonomy, ground-based maintenance.