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Small celestial body soft landing differential game control method in uncertain environment

A control method and landing control technology, applied in the field of deep space exploration, can solve the problems of probe landing collision, low probe escape speed, escape, etc., to improve the landing accuracy and facilitate the optimal landing control strategy.

Active Publication Date: 2020-10-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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AI Technical Summary

Problems solved by technology

In the weak gravitational field, the escape velocity of the probe is very small, and a slight control error may cause the probe to collide when it lands, resulting in a bounce or even causing the probe to escape

Method used

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  • Small celestial body soft landing differential game control method in uncertain environment
  • Small celestial body soft landing differential game control method in uncertain environment
  • Small celestial body soft landing differential game control method in uncertain environment

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Embodiment Construction

[0052] In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below in conjunction with an embodiment and corresponding drawings.

[0053] Such as figure 1 As shown, the differential game control method for soft landing of small celestial bodies in an uncertain environment disclosed in this embodiment includes the following steps:

[0054] Step 1. Determine the motion form of the lander in the irregular weak gravitational field.

[0055] by is the state variable, and the detector is fixed in the coordinate system at the center of the small celestial body The kinetic equation below is

[0056]

[0057] small and satisfy u=T / m with the control acceleration vector u, I sp is the specific impulse of the aircraft thruster, g E is the gravitational acceleration at the sea level of the earth, a d for unmodeled perturbations and subject to white Gaussian noise

[0058]

[0059] Wherein,...

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Abstract

The invention discloses a small celestial body soft landing differential game control method in an uncertain environment, and belongs to the technical field of deep space exploration. The implementation method comprises the following steps of under a condition that a target small celestial body accurate gravitational field model is unknown, determining a lander motion form in an irregular weak gravitational field, using a state error propagation method to design a virtual moving target landing point, and converting an uncertainty influence of the irregular gravitational field on lander motioninto random motion of the virtual moving target landing point; and designing an optimal landing control strategy of the lander based on zero and random differential games, and making the lander land according to the optimal landing control strategy so as to improve the landing precision of the lander at a predetermined position on the surface of the small celestial body.

Description

technical field [0001] The invention relates to a landing control method, in particular to a small celestial body soft landing control method, and belongs to the technical field of deep space exploration. Background technique [0002] Accurate and soft landing on the surface of small celestial bodies is a necessary prerequisite for the implementation of in-situ detection and sample return on the surface of small celestial bodies. Due to the small mass of small celestial bodies, the weak gravitational force formed cannot condense them into spherical celestial bodies. Therefore, the small celestial bodies in the solar system have different shapes, which leads to the irregular distribution of the gravitational field around them, which is difficult to accurately model. [0003] Under the condition that the gravitational field environment is extremely complex and unknown and it is difficult to accurately model, it is extremely difficult to realize the soft landing control on the...

Claims

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Application Information

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IPC IPC(8): B64G1/24B64G1/62G06F17/11
CPCB64G1/24B64G1/62G06F17/11
Inventor 龙嘉腾朱圣英梁子璇徐瑞修文博
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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