Verification of FDIR Algorithm for SNUSAT-1 on 3-Axis Motion Simulator

摘要

In this paper, a Fault Detection, Isolation, and Recovery (FDIR) algorithm for SNUSAT-1 is verified. SNUSAT-1 is a standard 2U CubeSat of Seoul National University which has been developed with two operational requirements since 2012. The first one is a QB50 science mission, and the second one is to validate the FDIR algorithm developed by Seoul National University in the actual space environment. During the verification sequence, however, unexpected errors on the embedded computer can occur, and it would have a serious effect on the whole missions. Therefore, it is essential to verify the algorithm logic itself and identify problems on the integrated system before the launch. For this reason, a simulator with a low-friction spherical air bearing is proposed to confirm the performance of FDIR algorithm. On the simulator, redundant IMUs and reaction wheels are arranged geometrically same with the configuration of the real satellite to apply the FDIR algorithm which consists of sensor FDIR and actuator FDIR. Our final goal is to validate the FDIR for each component before the launch of satellite and the sensor FDIR based on the Parity Space Approach(PSA) is successfully verified. However, the validation of actuator FDIR is end in failure due to some technical problem and the works to solve this problem is on-going. The main contribution of the research is that the implementation of FDIR algorithm for the CubeSat is technically verified on the real embedded system.