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Double-ring guidance method of skip re-entry

A jumping, calculation formula technology, applied in the double-loop guidance field of jumping reentry, can solve problems such as high-speed ballistic instability

Active Publication Date: 2015-08-19
BEIJING INST OF CONTROL ENG
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  • Description
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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

Method used

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  • Double-ring guidance method of skip re-entry
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  • Double-ring guidance method of skip re-entry

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Embodiment

[0062] Such as figure 1 As shown, a jumping reentry double-loop guidance method divides the reentry guidance task of the aircraft into a slow-period guidance part and a fast-period guidance part, in which the calculation of the slow period is carried out according to the NΔT period, where N is greater than 1 A positive integer, ΔT represents a minimum guidance scheduling period, usually 10 to 200 milliseconds; for slow period tasks, that is, every NΔT time, restart the next round of slow period guidance, so all calculations in each round need to be completed within NΔT time The fast-period guidance is carried out according to the ΔT period, that is, the next round of fast-period guidance is restarted every ΔT time; the priority of the fast-period guidance is high;

[0063] The above N=25, ΔT=0.16 seconds;

[0064] In the slow period calculation, the task of landing point prediction, deviation correction and corrected trajectory calculation is performed in sequence, and finall...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/24
Inventor 张钊杨鸣董文强胡军
Owner BEIJING INST OF CONTROL ENG
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