Integrated System Health Management Research and Application on Satellite

Integrated system health management (ISHM) technology is the extension of fault diagnosis and fault tolerant control and also is an important research direction of satellite engineering in the future. The ISHM of satellite, which can support satellite self-sufficient, aims to improve the reliability, safety and economy. In this paper, the overall architecture of the ISHM of on-orbit satellite is firstly constructed, which is divided into several layers, including system-level layer, subsystem layer, reasoning and diagnosis layer and single machine layer. The functions and tasks of each layer are analyzed, and the differences between ISHM and traditional fault diagnosis methods are proposed. Secondly, according to the analysis of history fault data, the subsystems who are prone to fault are studied and the ISHM schemes for these subsystems are designed. Finally, key technologies for achieving ISHM of satellite, such as the use of advanced distributed sensor system, improvement of software and hardware on board, and the application of intelligent algorithms, are illustrated and discussed.