Research On Guidance Technology Of Reentry For Hypersonic Gliding Vehicle

In this paper, the research work is carried out around the reentry guidance of gliding hypersonic vehicle, focus on the research of reentry trajectory design and guidance technology for the characteristics such as bad flight environment?strict constraint conditions and high terminal guidance accuracy requirements.The domain of the speed and space in the process of reentry is very large, according to the different guidance requirements in different areas, the reentry process is divided into three stages, followed by the initial descent, gliding and terminal guidance.The key of the reentry guidance scheme is gliding and terminal guidance.The trajectory design of the gliding trajectory is based on the off-line trajectory design method of the reentry corridor. With the constraints requirements, the reentry corridor in velocity-height section and velocity-drag acceleration section are described, which limits the range of the reentry flight parameters. Based on the velocity-drag acceleration corridor, a fast analysis method of the reentry reachable domain is proposed, which can be used for the rapid analysis of the feasibility of the mission. With the velocity-height corridor, a nominal velocity-height profile is designed to satisfy the process constraints and the range constraint requirements. On the hand of gliding trajectory tracking guidance method, the guidance law which control roll angle to track height is designed, and a range correction method based on compensation of the attack angle is proposed.The terminal guidance law is designed by the method of three dimension proportional navigation. Referring to the mind of BTT control, allocate the lift to lateral and vertical to realize the coordinated control of lateral and vertical guidance channels.Finally, simulation environment of six degrees of freedom is constructed to verify the reentry guidance strategy. The simulation results show that the proposed reentry guidance method can satisfy the process constraints and the final position coordinates.