Fault tolerant and anti-disturbance sliding mode control for microsatellite attitude control system

In this paper, a disturbance observer based sliding mode control method is proposed for microsatellite attitude control system with the multi-source disturbance and fault of flywheel simultaneously. The proposed method designs a fault diagnosis observer and a disturbance observer to estimate the time varying fault and the disturbance of flywheel. The equal fault and disturbance is compensated in the equal control signal of sliding mode control. A numerical example of the satellite attitude control system is worked out to demonstrate the effectiveness of the proposed design technique.