Design and Simulation of Sliding Mode Variable Structure Control for Satellite Attitude Based on Piecewise Power Approaching Law

In order to improve maneuver performance and attitude control precision of satellite operating on orbit, Integral Sliding Mode Variable Structure Control (ISMVSC) method is proposed for satellite attitude maneuver, which is based on model characteristic and external disturbance influence of satellite dynamics. Attitude control law for roll, pitch and yaw is designed separately in this method. Firstly, sliding mode switching plane is constructed through attitude angle error and its corresponding integration error combined with attitude angular velocity error. Then, ISMVSC algorithm is derived from the Piecewise Power Approaching Law (PPAL). Finally, simulations on control algorithm based on different approaching law are conducted successively. The results show that maneuver speediness and control stability for ISMVSC algorithm based on PPAL are optimal and more suitable for satellite attitude control, moreover no chattering phenomenon occurs.