Hybrid system description based research on attitude control system of satellite

Hybrid automata theory is used in researching the attitude control system of satellite, which is always confined to the continuous variable dynamics. This paper mainly research how to make the discrete state of attitude control system transform in the expected way with the condition that lots of physical discrete events are uncontrollable. In order to solve this problem, same new concepts such as the trigger domain of discrete event, the feasible initial domain of discrete event and discrete state distance are proposed. An algorithm is given here to make the expected uncontrollable events trigger by controlling the continuous variable dynamics. The simulation of the whole hybrid system shows that the attitude control system of satellite designed with the theory of hybrid system acquire not only high performance in real time control of attitude stabilization and attitude maneuver but also stronger reliability and the autonomy for dealing with some abnormal situations.