Adaptive attitude control for manned lunar lander during the powered descent phase

Abstract:

During the powered descent phase of manned lunar lander, offset of center of mass and attitude disturbance brought by the offset are outstanding,so the combined Reaction Control System (RCS) and Thrust Vector Control (TVC) attitude control method is proposed. Based on the lunar lander's attitude kinematic and dynamic models, adaptive attitude controller and estimator of center of mass offset are developed. Stability of closed-loop attitude control system is proved via Lyapunov method, while error characteristic of RCS and TVC is imported to verify the controller's robustness. Numerical simulation results show that the proposed adaptive attitude control method is feasible, and the designed attitude controller can guarantee the attitude control system stable and possess robustness.