A survey on Fault Detection, Isolation and Recovery (FDIR) module in satellite onboard software

摘要

The complexity of the avionic systems in satellites is rising as space missions become increasingly more sophisticated. This complexity emphasizes the need for more dependable systems with minimal anomalies. As satellite manufactures seek to convert many hardware implemented functionalities into software, the On-Board Software (OBSW) is becoming a major component in every satellite. Noticeably, more tasks for Fault Detection, Isolation and Recovery (FDIR) are being implemented in software, where the need comes for a well-defined software architecture that supports a cost-effective implementation of the FDIR functions. FDIR was already explained as key functionality of the OBSW. Obviously not all failures are subject to onboard identification and not all failures are subject to onboard recovery. The FDIR concept to be worked out for the spacecraft during the engineering phase follows some basic requirements and principles, implements a certain failure hierarchy- specifying furthermore on which level the failure is to be fixed- and finally it implements a consistent approach for the functionality transferring the spacecraft to Safe Mode and how to recover from there.