Which fault-tolerance technique is commonly used to handle single-event upsets in space?

Which fault-tolerance technique is commonly used to handle single-event upsets in space?

• A. Single-point failure analysis.
• B. Radiation hardening and error detection/correction (ECC, watchdogs).
• C. Thermal insulation only.
• D. Manual reboot on every cycle.

Answer: (B)

Single-event upsets are flips of bits caused by radiation in the space environment. The most effective way to handle them is to combine hardware hardening with error-detection and correction mechanisms. Radiation hardening reduces how often a flip actually occurs by using hardened circuitry, shielding, and robust design choices so the system is less sensitive to charged particles. On top of that, error detection and correction, such as ECC in memory and watchdog timers, automatically identifies and fixes flips that do happen and can reset or re-run components when needed. ECC can correct single-bit errors and detect multi-bit errors, while watchdogs help ensure the system doesn’t stay stuck in a bad state after a transient fault. This approach provides both resilience against faults and a reliable way to recover autonomously, which is essential for space systems. The other options don’t address radiation-induced upsets: single-point failure analysis is a planning method, thermal insulation alone doesn’t tackle radiation effects, and rebooting manually every cycle is impractical for autonomous operation.

Single-event upsets are flips of bits caused by radiation in the space environment. The most effective way to handle them is to combine hardware hardening with error-detection and correction mechanisms. Radiation hardening reduces how often a flip actually occurs by using hardened circuitry, shielding, and robust design choices so the system is less sensitive to charged particles. On top of that, error detection and correction, such as ECC in memory and watchdog timers, automatically identifies and fixes flips that do happen and can reset or re-run components when needed. ECC can correct single-bit errors and detect multi-bit errors, while watchdogs help ensure the system doesn’t stay stuck in a bad state after a transient fault. This approach provides both resilience against faults and a reliable way to recover autonomously, which is essential for space systems. The other options don’t address radiation-induced upsets: single-point failure analysis is a planning method, thermal insulation alone doesn’t tackle radiation effects, and rebooting manually every cycle is impractical for autonomous operation.