Full-stage reentry return guidance method for reusable launch vehicle

Abstract

The invention belongs to the field of aerospace craft guidance, and aims to enable an RLV to still obtain a guidance instruction enabling a track to strictly meet heat flow, overload and dynamic pressure constraints under the condition that the RLV is affected by external disturbance and uncertain factors, and finally land at an appointed runway position at a proper speed. Therefore, the technicalscheme adopted by the invention is as follows: the full-stage reentry return guidance method for a reusable launch vehicle comprises the following steps of: 1, guidance of an initial descending section; 2, gliding section guidance; 3, guidance of a terminal energy management section; 4, automatic landing section guidance: keeping the heeling angle to be 0 in the transverse direction; in the longitudinal direction, the automatic landing section is designed to be formed by combining a quasi-balanced gliding section and an exponential gliding section, an attack angle instruction is determined bydesigning a track angle function, and the height of a switching point of the two sections is designed through a secant method, so that the RLV can make contact with the ground at a preset speed and atrack angle. The method is mainly applied to aerospace craft guidance occasions.

Description

technical field [0001] The invention belongs to the field of aerospace vehicle guidance, in particular to a full-stage reentry and return guidance method for a reusable vehicle. Background technique [0002] Reusable Launch Vehicle (RLV, Reusable Launch Vehicle) refers to a multi-purpose reusable aircraft that can freely travel between the earth and space orbit to perform load delivery tasks. The RLV full-stage re-entry and return process starts at 120 kilometers and ends on the ground. The entire re-entry and return process has a large flight envelope, with altitudes spanning the space domain, suborbital and aviation domains, and speeds spanning hypersonic, supersonic and subsonic. A single re-entry return guidance method cannot complete the safe return and landing mission in such a complex flight environment, so the re-entry return process is generally divided into three stages: the re-entry segment (120km-25km), the terminal energy management segment (25km- 3km) and the ...

AI Technical Summary

Problems solved by technology

[0006]At present, for the problem of RLV full-stage reentry and return guidance, domestic and foreign scholars only design guidance laws for a certain stage in the reentry and return stage, and lack a comprehensive The stage reentry return guidance method leads to problems such as inconsistent models and aerodynamic parameters, and state quantity jumps at switching points between multiple stages.

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