Hypersonic speed reentry guidance method based on analytical solution of smooth and steady glide trajectory

Abstract

The invention relates to a hypersonic speed reentry guidance method based on an analytical solution of a smooth and steady glide trajectory. The method includes the following steps that firstly, a flight vehicle dynamics model is established; secondly, a restraint model is established; thirdly, an initial descent stage guidance method is performed; fourthly, a smooth and steady glide stage guidance method is performed; and fifthly, a height adjustment stage guidance method is performed. The hypersonic speed reentry guidance method based on the analytical solution of the smooth and steady glidetrajectory has the advantages that prediction correcting of the longitudinal travel and the transverse travel is performed based on the analytical solution of a three-dimensional trajectory, the calculation amount is greatly reduced, the calculation speed is increased, and real-time application to an airborne system is facilitated. Transverse movement is determined by twice heeling reversing points, the first-time reversing point position is corrected to control the terminal transverse travel error, and the second-time reversing point position is corrected to meet the terminal speed restraint. Compared with a traditional method controlling transverse movement through a course error threshold, the number of heeling overturning times is reduced, the energy utilizing efficiency is improved,and the requirement for a control system is lowered. A proportional guidance thought is utilized in the height adjustment stage to make the terminal heeling angle converge to 0, and the target striking effect is enhanced.

Description

Technical field [0001] The invention provides a hypersonic reentry guidance method based on the analytical solution of the smooth gliding trajectory, and belongs to the fields of aerospace technology and weapon technology Background technique [0002] The design of the reentry guidance law is the core technology of whether the hypersonic reentry glider can complete the precision strike mission. The ultimate goal of reentry guidance is to successfully guide the hypersonic reentry vehicle to the specified target while satisfying path constraints and terminal constraints. [0003] The reentry vehicle is subject to strict path constraints during the reentry process. However, traditional algorithms have always been difficult to process path constraints, which brings difficulties and challenges to the online generation of trajectories and the online calculation of guidance laws. At the same time, because the extremely fast gliding flight speed puts forward higher requirements for the ca...

AI Technical Summary

Problems solved by technology

[0003] The re-entry vehicle is subject to strict path constraints during the re-entry process. However, traditional algorithms have always been difficult to deal with path constraints, which brings difficulties and challenges to the online generation of trajectories and online calculation of guidance laws.

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