ROBUST ADAPTIVE BACKSTEPPING FAULT-TOLERANT ATTITUDE CONTROL FOR SMALL SATELLITE

Guo-qiang Wu, Bao-jun Lin, and Xiao-lin Chen

Keywords

Small satellite, attitude tracking, backstepping, sliding mode, faulttolerant control, robust control

Abstract

In this paper, an adaptive backstepping fault-tolerant control law is proposed for attitude manoeuvre of small satellite suffering from external disturbances and actuator failures. In the method, an adaptive scheme is designed to estimate the minimal value of actuation effectiveness factor, the upper bounds of the disturbances and the maximal values of bias faults, and thus the fault detection and isolation algorithm is avoided. Then a backstepping sliding mode controller is designed to achieve fault-tolerant control and disturbance rejection. The closed-loop system is proved to be globally asymptotically stable according to Lyapunov theory. The numerical simulation results show that the proposed controller can achieve expected tracking performance, great fault-tolerant capability and robustness.

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