FAULT PROTECTION ARCHITECTURE FOR THE COMMAND AND DATA SUBSYSTEM ON THE CASSINI SPACECRAFT

摘要

Cassini is a NASA/JPL spacecraft that is planned to be launched in 1997 for a 10.7 year mission (6.7 in transit, 4 in orbit) to the planet Saturn. This paper focuses on one subsystem on the spacecraft, the Command and Data Subsystem (CDS).rnThe paper will present overviews of the Cassini and CDS avionics and then describe the internal fault protection architecture for the subsystem. This description will cover fault detections, error filtering, event activation rules, and response triggering for the following key subsystem regions:rn1 Command and Data Electronics Assemblies (CDEAs),rn2 1553B Bus (CDS bus) and Remote Terminal Communication Interface Units (RT CIUs),rn3 Remote Engineering Units (REUs), andrn4 Solid State Recorders (SSRs).