Abstract:

For the interception problem of maneuvering target by the missile with non-affine form, a class of differential game-based non-affine learning sliding mode guidance method is investigated. Firstly, an auxiliary system is constructed and the guidance model is converted into augmented control-affine form. For the disturbance caused by the unknown target maneuver, the adaptive sliding mode control strategy is designed to counteract the matched part and force the states to move along the predefined sliding surface. Then, for the equivalent sliding mode dynamic system, which contains unmatched part, the critic network is utilized to learn the optimal differential game control strategy and the predefined performance function is satisfied. The closed-loop system is proved to be bounded by Lyapunov theory. Finally, the simulation results indicate the target can be intercepted by the missile successfully and the proposed guidance law is verified to be effective.

Key words: non-affine missile system, learning sliding mode guidance, unknown target maneuver, differential game