In this paper, a new method to handle faults for flexible satellite attitude control system during orbit maneuver is investigated. Fault tolerant control based on on-line control allocation is proposed to keep the stability and reliability of the system. First, a robust adaptive controller which considers constrained input and external disturbance is discussed. If faults occur, an on-line control allocation scheme for satellite attitude control system with actuator redundancy is adopted. In this way, fault tolerant control can be realized without reconfiguring the baseline controller. Numerical simulation is given to demonstrate the effectiveness of the methods suggested in this paper.
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