Reentry vehicle switched polytopic system control based on disturbance observer

To solve the control problem of reentry vehicles which have large flight envelope, system uncertainties and disturbances, the switched polytopic systems are establised. The reentry vehicle is modelled as the switched polytopic system. Both system uncertainties and disturbances are considered as complex disturbances. A kind of disturbance observer is proposed base on the adaptive Super-Twisting algorithm to estimate the complex disturbances. And the estimate value is used to compensate the disturbances in the controller. The stability of the closed loop system considering the complex disturbances in the entire envelope is proved by Lyapunov function. The simulation result validates that the proposed method has the ability of anti-disturbance and can achieve accurate command tracking.