A Real-Time Hierarchical Fault Diagnosis Strategy for SADA Based on Information Fusion

Solar Array Drive Assembly (SADA) is one of the key components in Attitude and Orbit Control System (AOCS) because its functional capability of controlling solar array has an extraordinary effort on power generation of spacecraft. Since SADA is required to be operated during the entire life-cycle of mission, it is important to implement effective real-time fault diagnosis on SADA for satisfying the power demand of spacecraft when SADA is not working appropriately. This paper proposes a real-time hierarchical fault diagnosis strategy for SADA based on information fusion to guarantee the reliability and safety operation of SADA. Moreover, control strategy for SADA with dual-channel resolver is introduced in this paper. Furthermore, the category of faults regarding to system-level and component-level is analyzed, and simulations based on specific fault scenarios are conducted. The simulation results demonstrate that the fault in component-level or system-level can be diagnosed efficiently and treated properly with the proposed strategy.