A Double-loop Guidance Method for Jump Reentry

Abstract

The invention relates to a double-ring guidance method of skip re-entry, and belongs to the field of the guidance of the re-entry of aircrafts. According to the double-ring guidance method disclosed by the invention, the control precision of the guidance method to terminal distribution is improved by utilizing the prediction-correction executed by slow guidance tasks, and the problem that the control demand of high precision of skip re-entry is difficult to satisfy by only using the standard trajectory method is solved. According to the double-ring guidance method disclosed by the invention, the problem that the control precision of fall points is reduced by only using a prediction guidance method after the navigation precision deteriorates under large dynamic conditions is solved by utilizing a standard trajectory tracking method executed by fast guidance tasks. The prediction-correction executed by slow guidance in the double-ring guidance scheme disclosed by the invention solves the problem of the control precision of the secondary re-entry section under the conditions of initial large distribution.

Description

technical field [0001] The invention relates to a jump-type reentry double-loop guidance method, which belongs to the field of aircraft reentry guidance. Background technique [0002] After the lunar exploration and return vehicle enters the earth's atmosphere at high speed, the required voyage range is within the range of 4000-8000km, and the ballistic trajectory often has an obvious jump process. The standard ballistic guidance law can track the design trajectory by correcting the roll angle, but this method is based on the theory of small deviation linearization, and it is difficult to adapt to the problem of strong nonlinearity of the trajectory characteristics; In terms of guidance law design, a large trajectory tracking control gain is very likely to cause command saturation, while a small gain is often difficult to ensure control accuracy. For the controlled process with strong nonlinear characteristics such as jump reentry (ballistic instability in the initial reent...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the existing standard ballistic re-entry guidance technology, and provide a jump-type re-entry double-loop guidance method, which solves the problem of high-speed ballistic instability, and the method can obtain high drop point dispersion At the same time, the calculation is simple and the engineering realization is easy

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