Journal of Astronautics ›› 2021, Vol. 42 ›› Issue (12): 1550-1558.doi: 10.3873/j.issn.1000-1328.2021.12.008

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Reachable Zone Generation for Irregularly Shaped Asteroid Landing

HUANG Mei yi, LIANG Zi xuan, CUI Ping yuan   

  1. 1. Institute of Deep Space Exploration, Beijing Institute of Technology, Beijing 100081, China;2. Key Laboratory of Autonomous Navigation and Control for Deep Space Exploration, Ministry of  Industry and Information Technology, Beijing 100081, China

  • Received:2021-02-26 Revised:2021-05-19 Online:2021-12-15 Published:2021-12-15

Abstract: A reachable zone generation method based on the dynamic neighborhood search is developed for landing on irregularly shaped asteroids. Firstly, the reachable zone is formulated, and a centroid distance mapping function is designed to constrain the terminal position of a trajectory with an unfixed landing point. On this basis, the reachable zone generation problem is decomposed into three sub problems: the reference point calculating, the starting point calculating, and the boundary points searching. The reference and the starting points are solved by a trajectory optimization for minimum fuel and maximum distance, respectively. The boundary points are calculated using a guided dynamic neighborhood search method, and in each search cycle, the minimum fuel is optimized with a fixed landing point. Finally, the proposed method is verified using the 433 Eros model. The results indicate that the method is effective in generating a reachable zone on an irregular surface, efficient in searching the boundary points, and applicable to various initial positions and fuel consumptions.

Key words: Asteroid landing, Reachable zone, Trajectory optimization, Neighborhood search

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