| Summary: | Aiming at the limited fault diagnosis and performance monitoring capabilities problem of satellite power control unit (PCU), the testability design is done for the PCU and the on-orbit fault diagnosis and performance monitoring system based on BIT technology is built. The BIT module consists of three analog boards and one core board. The analog board can perform high-speed sampling of dozens of analog signals, while the core board can run fault diagnosis and performance monitoring algorithms, and other works such as data storage, data packaging, and communication. The result of fault diagnosis and performance monitoring is sent to the communication interface after packaging. The verification experiment shows that the system can accurately detect and locate the fault of the PCU fastly without affecting the normal operation of the PCU. Meanwhile the performance of the PCU, such as bus voltage ripple, can be monitored.
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