Abstract:A recursive integral sliding mode control method based on the adaptive sliding mode disturbance observer is proposed for the reentry attitude control of reusable launch vehicles with model uncertainties and external disturbances. Firstly, based on the attitude motion model of reusable launch vehicles in re-entry phase, a control oriented model is established. Secondly, an adaptive sliding mode disturbance observer is designed to accurately estimate and compensate the compound disturbances composed of model uncertainties and external disturbances. Then, a new recursive integral sliding mode controller is designed based on the recursive idea, and the finite time stability of the closed-loop system is proved by using the Lyapunov stability theory. Finally, the numerical simulation results show that the proposed method has strong robustness and fast convergence speed.