Fault tolerant attitude control for spacecraft based on adaptive fast terminal sliding mode

Aiming at the attitude control problem of spacecraft with actuator faults,a novel method for designing fault-tolerant controller is proposed based on adaptive fast terminal sliding mode control.The method could improve the convergent rate of the spacecraft fault-tolerant controller and guarantee the finite-time stability by selecting the sliding mode surface with fast terminal feature.Furthermore,an adaptive control method is designed with the outcome of regulating controller parameters online and eliminating the dependence of fault-minimum-information.Numerical simulation demonstrates that the proposed method could achieve effective spacecraft fault-tolerant control.Specifically,when compared with the traditional sliding mode method,the convergent rates of attitude angle and angle rate decreased by 54.5% and 50% respectively,as well as the improvement of the robustness.