A SEMI-PASSIVE CONTROL SOLUTION TO BUAA-SAT ADCS: AN EARTH REMOTE SENSING STUDENT MICROSATELLITE

摘要

BUAA-sat is a 40kg microsatellite fully designed and ready to be manufactured by the Chinese and foreign students of Beihang university of China. The mission of this microsatellite is to take picture of itself during the boom deployment and imaging the Earth when the satellite is passing over Beijing. Therefore, to fulfill this requirement, 3-axis stabilization is required with the pointing accuracy of less than 5 deg and pointing stability of better than 0.01deg/s. This paper introduces the operational control modes of the ADCS, the control laws used at each operational mode, hardware used at each control mode, the difficulties, environmental effects on the satellite, challenges and considerations due to the boom, etc. In the analysis part, it explains the development of a Matlab based simulation that is used to design test the algorithm of BUAA-Sat and demonstrates the ability of ADCS design and hardware to meet the mission requirements. At last the verification procedure of the simulation and the selected devices are discussed to prove the results obtained by them are reliable and also to assess the affiliated uncertainties.