Guidance method for detecting small-celestial-body-surface movement

Abstract

The invention discloses a guidance method for detecting small-celestial-body-surface movement, and belongs to the field of space flight and aviation. The guidance method comprises the following steps that firstly initial velocity pulse is designed based on projectile motion to enable a detector to move towards a middle way point or a terminal target point in a bounce mode; and then a first-order sliding mode surface is designed to definite the target state of the detector. A second-order sliding mode surface is designed to track the first-order sliding mode surface, and an analytical expression of a guidance accelerated speed is deduced by using the second-order sliding mode surface; precise transferring of a single-time bounce of the detector is achieved by using the obtained guidance accelerated speed; and when a landing point is not the terminal target point, the precise transferring of the single-time bounce is repeated, and when the terminal target point is reached through the repeated precise transferring of the single-time bounce, the detector is precisely transferred to the terminal target point from a small celestial body surface. According to the guidance method for detecting small-celestial-body-surface movement, the control precision of the guidance method for detecting small-celestial-body-surface bounce and movement can be improved, and the robustness of the guidance method is improved.

Description

technical field [0001] The invention relates to a small celestial body surface movement detection and guidance method, which belongs to the field of aerospace. Background technique [0002] Small celestial body detection is an important part of deep space exploration. Carrying out sampling, photographing, geological analysis and other detection activities in areas with high scientific value on the surface of small celestial bodies can help humans obtain more abundant and effective scientific information, so as to improve the understanding of small celestial bodies. cognition. In order to successfully complete the surface detection task of small celestial bodies, the detector is required to have a high autonomous movement capability to achieve fixed-point precise movement. Compared with large planetary celestial bodies, small celestial bodies have the characteristics of small size and light weight, which leads to their extremely weak gravitational field. In this gravitationa...

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Problems solved by technology

[0003] In the development of small celestial body surface movement detection and guidance method development, prior technology [1] (see BelleroseJ, Scheeres D J.Dynamics and Control for Surface Exploration of Small Bodies[C].AIAA / AAS 2008Astrodynamics Specialist Conference,Honolulu, Hawaii, Aug.18-21, 2008: AIAA 2008-6251.) For the problem of bouncing and moving on the surface of small celestial bodies, a guidance algorithm is designed based on a parabolic motion model, but this method is based on a simplified motion model, so the control accuracy is poor

[0004] Prior technology [2] (see Shen H, Zhang T, Li Z, Li H. Multiple-Hopping Trajectories Near a Rotating Asteroid [J]. Astrophysics and Space Science, 2017, 362:45.) using particle swarm optimization algorithm to study The trajectory optimization problem of the bouncing detector moving on the surface of a small celestial body. Although this method uses an accurate dynamic model, the thrust design based on the optimization method is an open-loop idea, which is less affected by external disturbances and uncertain dynamic characteristics. Big

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