Sliding Mode Observer-Based FTC Strategy Design for Satellite Attitude Systems with Sensor Fault

This paper address the stabilization problem for the attitude systems of a rigid satellite with sensor faults and external disturbance. Firstly, a slide-mode observer (SMO) is designed for the faulty attitude systems of rigid satellite in order to estimate the unknown sensor fault. Moreover, a discontinuous input is given to reduce the impact of sensor faults and aggregated uncertainties. Then, an integral-type sliding-mode fault tolerant stabilization control scheme is proposed by using the estimated fault information, it ensures that the fault system is asymptotically stable. Finally, the effectiveness of the proposed fault tolerant stabilization scheme is demonstrated in the attitude systems of a rigid satellite subject to the time-varying sensor fault.