Abstract: Aiming at the attitude control problem during the rapid roll maneuvering of a near space vehicle, an improved super twisting sliding mode adaptive control method is proposed. Considering the model uncertainty and interference, the nonlinear coupling mathematical model of the near space vehicle is established. In order to enhance the robustness of the controller and reduce the impact of chattering, the super twisting sliding mode controller is designed and improved to improve the response speed and control accuracy. When the upper bound of the disturbance derivative exists but unknown, an adaptive law is designed to estimate the controller parameters. Lyapunov theory is used to prove the stability of the closed loop system, and the tracking performance and robust performance are verified through digital simulation. The simulation results show that the controller has great attitude control ability, and can effectively suppress interference, weaken chattering at the same time. Meanwhile, the control parameters are adaptive.

Key words: near space vehicle, attitude control, super twisting sliding mode, adaptive control