Rapid on-line planning method for soft landing burnup optimal trajectory of small celestial body

A small celestial body, optimal technology, applied in the field of deep space exploration, can solve the problem that offline planning trajectory cannot be applied online, and achieve the effect of ensuring rapidity and convergence

Active Publication Date: 2019-12-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At the same time, during the landing process of small celestial bodies, they will also be affected by disturbance fac

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  • Rapid on-line planning method for soft landing burnup optimal trajectory of small celestial body
  • Rapid on-line planning method for soft landing burnup optimal trajectory of small celestial body
  • Rapid on-line planning method for soft landing burnup optimal trajectory of small celestial body

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Embodiment Construction

[0082] 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.

[0083] Such as figure 1 As shown, the fast online planning method for the optimal trajectory of the soft landing fuel consumption of small celestial bodies disclosed in this embodiment, the specific implementation steps are as follows:

[0084] Step 1. Determine the control form under the condition of optimal fuel consumption, and the obtained control form satisfies the bang-bang form.

[0085] When considering the fuel consumption of the small celestial body landing movement, the detector mass m is an important parameter index that needs to be investigated. 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

[0086]

[0087] where, ω=[0,0,ω] T is the planetar...

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Abstract

The invention discloses a rapid on-line planning method for a soft landing optimal trajectory of a small celestial body, and belongs to the technical field of deep space exploration. The implementation method comprises the following steps: determining an optimal trace control form of small celestial body fuel consumption as a bank-bank control form, determining the switching times of controlling athrust amplitude bank-bank form, and determining a switching sequence of the bank-bank form for controlling the thrust amplitude on the basis of the switching times. Therefore, the optimal path planning problem of small celestial body fuel consumption is converted into the online search problem of the bang-bang control switching moment. Through a numerical prediction-correction strategy, on-linesearch is carried out on switching time, a two-variable search problem is converted into a sequence single-variable search problem of an inner loop and an outer loop, on-line generation of a small celestial body soft landing fuel consumption optimal trajectory is achieved, and rapidity and convergence of the landing trajectory planning method are guaranteed.

Description

technical field [0001] The invention relates to a trajectory planning method, in particular to an online rapid trajectory optimization method for soft landing of a small celestial body, and belongs to the technical field of deep space exploration. Background technique [0002] The implementation of precise soft landing is the premise of realizing the mission of in-situ detection and sample return on the surface of small celestial bodies. Because small celestial bodies are far away from the earth, there are large uncertainties in various physical properties of small celestial bodies, such as rotation angular velocity, gravitational field distribution, and celestial body mass. At the same time, during the landing process of small celestial bodies, they will also be affected by disturbance factors such as solar light pressure. These factors make offline planning of trajectories impossible for online applications. [0003] Considering the above factors, it is necessary to stud...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 崔平远龙嘉腾朱圣英徐瑞梁子璇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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