Abstract:An integrated guidance and control method with forward compensation is proposed according to the guidance and attitude control system of reentry vehicle. Firstly, an oriented-control integrated guidance and control model is built for reentry vehicle to intercepting maneuvering target. Secondly, a nonlinear disturbance observer is design to estimate the known disturbance, a traditional integrated guidance and control law is designed based on backstepping and sliding mode control method. An integrated guidance and control law with forward compensation is presented by the improving sliding mode to eliminate the coupling of control system, and the finite time convergence of guidance and control system is obtained. Finally, the simulation results of the six degree-of-freedom dynamic model show that the proposed method works with better guidance performance and robustness than the traditional integrated guidance and control method and separated guidance and control method.