A software reconfiguration method for CPU of satellite-board controller

Abstract

In order to improve the adaptability and maintainability of a certain type of servo controller in the space environment, BM3803 has three-mode redundancy, EDAC and parity check fault tolerance design, which can meet the requirements of radiation resistance, long life and high reliability in harsh space environment applications. Therefore, an on-orbit reconstruction method of on-board CPU software based on BM3803 processor is proposed based on this project. In this method, the up-coding program block sent by the integrated processor is received through RS485 bus, and the up-coding program is stored and run by partitioning EEPROM and SRAM. Multiple verification of the receiving process, improve the reliability of the file upload process; The packet serial number, packet check and total check are transmitted down by telemetry to realize effective monitoring of the up-filling process. The load switching between the original program and the reconfigured program is realized by the combination of recharging load and sending instruction. Through testing, the correctness, rationality and reliability of the scheme are verified. At present, the scheme has been applied in orbit.