Planet gravity-assist low-thrust trajectory optimization method based on decomposition and coordination strategy

Abstract

The invention relates to a planet gravity-assist low-thrust trajectory optimization method based on a decomposition and coordination strategy and belongs to the technical field of aerospace technologies. The planet gravity-assist low-thrust trajectory optimization method based on the decomposition and coordination strategy comprises firstly decomposing a planet gravity-assist low-thrust transfer trajectory optimization problem into a system-level optimization problem and two second-level optimization sub-problems with planet gravity-assist positions serving as nodes; and then utilizing the system-level optimization problem solving as a main iteration for coordinating status matching of the planet gravity-assist positions of the optimization sub-problems, and utilizing the second-level optimization sub-problem solving as an auxiliary iteration for determining thrust control laws of every subsection trajectory until the main iteration and the auxiliary iteration are both converged. The planet gravity-assist low-thrust trajectory optimization method based on the decomposition and coordination strategy reduces the complexity of an optimization model and the sensitivity of the trajectory constraint to optimized parameters, and improves the convergence efficiency of the transfer trajectory optimization problem.

Description

technical field [0001] The invention relates to an orbit optimization method based on a decomposition and coordination strategy for planetary leverage and small thrust, and belongs to the field of aerospace technology. Background technique [0002] The development of advanced propulsion technology and the discovery of new mechanisms of celestial mechanics have brought technological innovation to the flight mode of deep space probes. The typical representative is the transfer method combining small thrust propulsion system and planetary force technology, which has low launch energy, It has many advantages such as low fuel consumption and simple technical realization. At the same time, the introduction of these two new technologies also brought problems such as strong nonlinear orbit dynamics and complex optimization models, which made it difficult to converge the optimal design of the transfer orbit. Optimal design is a key technology for the research of planetary transfer o...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of sensitivity to initial value and poor convergence existing in the existing deep space exploration planetary force small thrust transfer orbit optimization method, the present invention provides a planetary force small thrust orbit optimization method based on decomposition and coordination strategy

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