Observer-Based Fuzzy Sliding Mode Attitude Control for Flexible Spacecraft

In this paper, the attitude stabilization of flexible spacecraft with unmeasurable states and disturbances is addressed by an observer-based fuzzy integral sliding mode control scheme. First, a Takagi-Sugeno fuzzy model of flexible spacecraft is established and an observer is proposed based on this model. The convergence conditions of the estimation errors are given by Lyapunov function and the gains of the observer are thus determined. According to the obtained estimates, a novel fuzzy sliding mode control strategy is designed to compensate the influence of disturbance. Finally, an example of flexible spacecraft is employed to verify the effectiveness of the proposed observer and control law.