Robust adaptive sliding mode control of near space vehicle based on disturbance observer

This paper proposes a robust adaptive sliding mode control strategy based on second order sliding-mode disturbance observer for the characteristics of nonlinear, fast time-varying, strong coupling and uncertainty during near space vehicle (NSV) making lager envelope flight. Firstly, a second-order sliding-mode disturbance observer is used to reconstruct compound disturbances. Then, feedback control law is designed using the fast terminal sliding mode. It is proofed that this method can guarantee the tracking error converge to zero in finite time. Simulation results show good control performance of the flight control system.