Backstepping Adaptive Fuzzy Control for a Class of Nonlinear Systems

In this paper, we propose a modified backstepping adaptive fuzzy control method in view of the nonlinear dynamic model of spacecrafts landing on irregular asteroids. Fuzzy logic systems are used to approximate complex nonlinear functions and the modified adaptive backstepping method is applied to constructing the controller. The proposed controller can realize the quick tracking of the reference signal when system parameters are uncertain with external disturbances. System stability and convergence is demonstrated by Lyapunov method. The efficiency and robustness of this control method is demonstrated by the numerical simulation.