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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (15): 528753-528753.doi: 10.7527/S1000-6893.2023.28753

• Flight Mechanics and Guidance Control • Previous Articles    

Adaptive initial value Newton-Raphson algorithm for free return orbit design in lunar exploration

Zeyue LI1,2, Haiyang LI1,2, Zhen YANG1,2(), Qibo PENG3   

  1. 1.College of Aerospace Science and Engineering,National University of Defense Technology,Changsha  410073,China
    2.Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions,Changsha  410073,China
    3.China Astronaut Research and Training Center,Beijing  100094,China
  • Received:2023-03-29 Revised:2023-04-26 Accepted:2023-05-15 Online:2023-08-15 Published:2023-05-26
  • Contact: Zhen YANG E-mail:yangzhen@nudt.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12072365);Technology Innovation Team of Manned Space Engineering

Abstract:

Free return orbit design is one of the indispensable parts in the orbit scheme design of manned lunar exploration missions. Existing methods for designing free return orbit are relatively complicated, and heavily dependent on initial values, which hinders direct high-precision design and the adaption to large-scale fast search requirements, and thus limits the efficiency of solving problems such as window design and reachable domain analysis. To solve these problems, a model of nonlinear equations with perilune pseudo-parameters as independent variables was first established in this paper. Then, a Newton-Raphson algorithm based on adaptive initial values for fast solution of the equations was proposed. Furthermore, two indexes were defined to evaluate the quality of the initial values and the capability of the algorithm. Compared with the simulation results of Sequential Quadratic Programming algorithm, the calculation speed of the proposed method was significantly improved, and the simulation results of high-precision calculation showed a significant enhancement in large-scale search capability.

Key words: manned lunar exploration, adaptive initial value, Newton-Raphson, free return, large-scale search

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