Reentry flight attack angle guiding method of sub-orbital vehicle

Abstract

The invention discloses a reentry flight attack angle guiding method of a sub-orbital vehicle. The method comprises the following steps of: acquiring an attack angle design predicted value through analogue simulation at time intervals; finding the attack angle design predicted value, which keeps a normal overload value of the vehicle always in a fluctuation region of expected normal overload dynamic balance, by using a vehicle homomorphic prediction model in each time interval, so as to realize normal overload dynamic balance at the time interval; acquiring a practical reentry flight attack angle design parameter of the vehicle through the attack angle design predicted value by a fitting method, and determining a reentry flight attack angle design value of the vehicle; and introducing resistance acceleration integration ratio correction at each flight time to make a practical reentry flight resistance acceleration integral value tend to be the same as a predicted resistance acceleration integral value under the attack angle design value, so the reentry flight normal overload of the sub-orbital vehicle is kept to fluctuate in a predetermined region in a dynamic balance section consisting of each time interval and then the aim of reducing the reentry flight normal overload peak value of the sub-orbital vehicle is fulfilled.

Description

technical field [0001] The invention relates to the technical field of guidance and control, in particular to an angle-of-attack guidance method for reentry flight of a suborbital vehicle. Background technique [0002] As the product of the organic combination of aviation and spaceflight, suborbital vehicles have the application advantages of providing regional coverage, emergency delivery and rapid response. Its active area—near space—is not only a threat to spacecraft, but also restricts aviation. It has become a new hotspot in the field of aerospace research and a growth point of strategic high technology. [0003] Aircraft reentry flight refers to the flight process of a spacecraft or aircraft re-entering the earth's atmosphere from the outside or edge of the earth's atmosphere until it lands. [0004] The re-entry flight process of the suborbital vehicle and the re-entry flight of the space shuttle have both similarities and different characteristics. The difference i...

AI Technical Summary

Problems solved by technology

[0013] In the course of the research, the inventors found that in the existing angle of attack design method, the descending slope of the adjustment of the angle of attack is a fixed value, so that the normal overload during the reentry process of the suborbital vehicle with a relatively low speed is characterized by a single peak or a double peak. peak characteristics, and the peak value of the normal overload is relatively large

Therefore, the angle-of-attack guidance method based on the existing angle-of-attack design method also has the problem that the peak value of the normal overload is too large

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