Hybrid search method for continuous thrust orbit near irregular-shaped small celestial body

Abstract

The invention discloses a hybrid search method for a continuous thrust orbit near an irregular-shaped small celestial body, and belongs to the technical field of aerospace. The implementation method comprises the following steps: converting the initial state of an orbit from a small celestial body fixed connection system to an inertial system; obtaining an initial value of the continuous thrust transfer orbit by utilizing a homotopic method under the inertial system; establishing a continuous thrust equation under the fixed connection system by taking irregular-shaped perturbation of the of the small celestial body into consideration; transferring the initial orbit from the inertial system to the fixed connection system to serve as an initial value of the continuous thrust orbit; and solving an optimal transfer opportunity near the irregular small celestial body by adopting a convex optimization method by taking collision constraint into consideration. According to the invention, the problems that irregular-shaped perturbation cannot be considered in the homotopic method and that initial value searching is difficult in the convex optimization method are solved, searching for the continuous thrust transfer orbit near the irregular-shaped small celestial body is achieved, the searching convergence and precision of transfer orbit near the irregular-shaped small celestial body areimproved, and the method also has the advantages of high precision and convergence.

Description

technical field [0001] The invention relates to a method for transferring a continuous thrust orbit near a small celestial body, in particular to a continuous thrust orbit search suitable for considering the gravitational field of an irregular shape of a small celestial body, and belongs to the field of aerospace technology. Background technique [0002] Small celestial bodies are known as the living fossils of the solar system. The study of small celestial bodies will help humans understand the formation and evolution of planets and the origin of life, and also provide important information for the defense of small celestial bodies. Therefore, the exploration of small celestial bodies is a hot topic in the field of deep space exploration. [0003] The detection of small celestial bodies requires global mapping and observation of small celestial bodies. It is usually difficult to observe the entire surface of a single mission orbit, so it needs to be transferred between mult...

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Problems solved by technology

[0007] The technical problem to be solved by a continuous thrust orbit hybrid search method near irregular shaped small celestial bodies disclosed by the present invention is: combining the advantages of homotopy method and convex optimization method to perform continuous thrust orbit hybrid search near irregular shaped small celestial bodies, which can solve The problem that the homotopy method cannot consider the perturbation of irregular shapes can solve the problem of difficult initial value search in the convex optimization method, realize the continuous thrust transfer orbit search near irregular small celestial bodies, and improve the transfer near irregular small celestial bodies Convergence and precision of track search, with the advantages of high precision and good convergence

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