Finite-Time Disturbance Rejection Control for Rigid Spacecraft Attitude Set Stabilization With Actuator Saturation
Zuo Wang, Zeyu Guo, Shihua Li
Abstract
Rigid spacecraft plays significant roles in future space exploration. In this paper, a continuous bounded switching solution is studied for the finite-time attitude stabilization control of spacecraft system considering actuator saturation problem. Firstly, with the adoption the super-twisting disturbance observer, the lumped disturbance within the spacecraft dynamics can be accurately estimated. Then, combining with disturbance estimations, a composite switching control approach is proposed, which is transitioned from discontinuous relay polynomial form to continuous non-smooth form. With the proposed controller, spacecraft attitude is finite-time set stable even with multi-source disturbances. Moreover, the actuator saturation problem will not be violated and a bounded control input amplitude is obtained. Finally, various simulation cases are characterized by stronger disturbance rejection ability and higher attitude tracking accuracy as compared with existing solutions.