A fault-tolerant control method for satellite with uncertainties

A fault-tolerant control scheme including discrete-time integral sliding mode, control allocation and parameter identification is introduced to deal with uncertainties and faults. When faults happen, control allocation can redistribute the control effort to the available actuators based on their efficiency levels. Discrete-time integral sliding mode control has strong robustness to uncertainties. In the controller design, uncertainties are evaluated and compensated, which helps enhance the robustness. The existence of the sliding surface and the stability of the closed system are discussed respectively. The method is applied to a six-wheel spacecraft and simulations are given to show its effectiveness.