Spacecraft on planetary or other deep space missions require a high degree of autonomy in detecting and responding to faults that may occur during their flights. At the same time, the financial, staffing, and schedule constraints of "better - faster - cheaper" missions impose tight limits on fault protection implementations. SPIDER (Spacecraft Imbedded Distributed Error Response) is a linearized emergent system architecture for autonomous spacecraft fault protection. SPIDER was conceived to provide a robust fault protection capability, while reducing the amount (and thus cost) of non-recurrent engineering required to adapt the architecture to subsequent missions. While SPIDER was originally developed in support of several 3-axis stabilized spacecraft, it was felt that SPIDER could be adapted to other spacecraft configurations without great pain. Adapting SPIDER'S heritage flight software to the spin-stabilized Genesis has, in fact, proven to be an "acid test" of emergent system reuse.
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