An adaptive dynamic sliding mode attitude maneuver control law for rigid body satellites using VSCMG actuator

An adaptive dynamic sliding mode control law is proposed in this paper for rigid body satellite attitude control using variable speed control moment gyroscopes (VSCMG) actuators to improve the robustness of the control system under disturbances. In the proposed control algorithm, the disturbance torque is estimated by using some kind of adaptive method. The differential signal of the control torque is used as the controller output rather than the actual control torque itself. Therefore, the chattering problem of the control torque caused by the high-frequency switching action would be softened through the integral operation, so that the dynamic performance of the control system could be improved. Numerical simulation shows that rapid? attitude maneuvers of rigid body satellites could be accomplished in the presence of external disturbance and the inherent chattering problem of sliding mode control could be softened.