Robust fuzzy controller design for a rigid spacecraft attitude regulation system

The main problem addressed is attitude regulation of a rigid spacecraft with inertia parameter uncertainty, control input saturation and external disturbances. A robust fuzzy attitude control scheme is presented. The parallel distributed compensation (PDC) is applied to design the robust fuzzy controller, which guarantees robust stability of the close-loop system with respect to parametric uncertainty and bounded L₂-gain performance with respect to disturbances. Both robust stability and L₂-gain performance, together with input constraint, are incorporated in the linear matrix inequality (LMI) conditions. The feedback gains are obtained by the convex optimization technique based on LMI. Simulation results are included to demonstrate the effectiveness of the approach