Reentry Trajectory Planning and Tracking Law of Hypersonic Glide Vehicle Under the Influence of Environmental Uncertainty

Reentry trajectory planning and tracking are very important in the design of a hypersonic glide vehicle. For the problem of poor guidance accuracy in the reentry phase of gliding aircraft caused by space environment disturbance, a reentry trajectory planning and tracking law considering environmental model deviation is proposed. First, based on the parametric design model of the Height-Velocity (H-V) flight profile, an online design method of the reentry trajectory is presented. Secondly, based on the feedback linearization method, a trajectory tracking guidance law is given to obtain control commands and other trajectory parameters. Then, the state change caused by environmental uncertainty is regarded as disturbance, estimated, and compensated into the guidance command by using the extended state observer. Finally, the simulation test proves that the method can guarantee the vehicle reach the target area, and has strong robustness when considering the deviation of the environmental model.