Abstract: In allusion to the midcourse and terminal guidance handover difficulties caused by small and fast changing handover window when against hypersonic targets, the midcourse guidance trajectory of interceptor with the constraint of terminal position and velocity direction is designed. Firstly, considering the constraints of handover time, dynamic pressure, heat flow, overload, control command and terminal trajectory inclination angle, the optimization model of midcourse guidance trajectory in longitudinal plane of interceptor is established. Secondly, planar engagement geometry in the longitudinal plane is built, and the concept of energy constrained side window detection interceptor midcourse and terminal guidance handover window is put forward, which is used as the terminal constraint condition of trajectory design. Then, the optimized trajectory with midcourse and terminal guidance handover constraint is designed based on hp adaptive mesh refinement method. The simulation results show that the midcourse and terminal guidance handover window is well constructed and can describe the guidance terminal constraints completely. In addition, a succession scheme of leeward detection is proposed through simulation.

Key words: Trajectory optimization, Handover window, Side windows detection, Capture region, Mesh refinement