Flexible Satellite Attitude Control Via Sliding Mode Technique

Input-output (I/O) Inearization is a typical nonlinear control method in the multi-input multi-output (MIMO) system. In this paper, adaptive fuzzy sliding mode control incorporating input-output linearization is proposed to constitute the hybrid controller. The proposed method is then applied to the attitude maneuver control of the flexible satellite. The basic control structure is presented. The adaptive fuzzy control is utilized to approach the nonlinear control part of sliding mode control and the adaptive law is derived. The parameter of the adaptive fuzzy control is adjusted on-line to deal with the satellite uncertainty, thus the robustness is obtained. Simulation results show that precise attitude control is accomplished in spite of the uncertainty in the system.