Abstract
A watchdog system for nanosatellites has been developed to detect and recover from failures that produce fail-stop behavior (which is when a system halts in the presence of a failure) and failures that are restart curable. The watchdog is a hybrid architecture of linear and circular monitoring. It uses separate clock and power domains to improve robustness to system faults. The system is capable of detecting and recovering from restart-curable faults of the primary spacecraft systems. It has been implemented on multiple nanosatellite missions deployed near Earth and two missions in deep space. The watchdog provided critical reboots and power cycles for all missions and has been critical for mission success. It enabled the use of less radiation-tolerant components and off-the-shelf systems with both known and unknown faults. The watchdog provides a robust fault detection and recovery capability.
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