强机动目标虚拟迁移制导控制一体化拦截方法

Aiming at the characteristics of strongly maneuvering target interception at the terminal guidance with tremendous changes in relative motion relationship, short time and strong interference, a fixed-time adaptive integrated guidance and control method based on the virtual migration strategy is proposed. Firstly, in order to solve the problem of complicated relative motion relationship in the confrontation environment caused by strong maneuver of target, a virtual migration strategy is designed to transform the strongly maneuvering target into virtual stationary target through state information transfer, the concept of virtual line-of-sight is introduced and the three-channel coupling integrated guidance and control interception model with disturbance information is constructed. Secondly, in order to realize rapid interception under strong disturbance, the controller design of the interception model is developed based on the fixed-time sliding mode control theory and dynamic surface method. The fixed-time adaptive perturbation observer is used to estimate and compensate the disturbance such as target’s maneuver and aerodynamic uncertainty, so as to relax the limit on that the upper bound of disturbance is known and improve the robustness of system. The stability of the system is proved by Lyapunov method. Finally, through numerical simulation analysis, it is proved that the proposed method can effectively suppress the uncertain disturbance of the system and has the ability to intercept the strongly maneuvering target rapidly.