A Fully Actuated System Approach for Flexible Spacecraft Fault-Tolerant Attitude Control

This paper investigates spacecraft attitude fault-tolerant control within the fully actuated system theory framework, focusing on flexible spacecraft with large symmetric solar panels and considering actuator faults and saturation. A novel control scheme using adaptive fuzzy observers and Nussbaum - gain techniques is proposed. First, a fully actuated attitude model of the flexible spacecraft is established, incorporating actuator faults and saturation. Then, an adaptive fuzzy observer is designed to estimate and compensate for system nonlinearities, combined with Nussbaum - gain adjustment for handling actuator faults and saturation. The controller is designed via the direct parameter method. The system and observer stability and state convergence are proven using Lyapunov stability theory. Finally, numerical simulations validate the scheme's effectiveness and superiority.