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Low-thrust trajectory optimization of asteroid sample return mission with multiple revolutions and moon gravity assists

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 107-120页

作者： TANG Gao JIANG FangHua LI JunFeng School of Aerospace Engineering Tsinghua University

Near-Earth asteroids have gained a lot of interest and the development in low-thrust propulsion technology makes complex deep space exploration missions possible. A mission from low-Earth orbit using low-thrust electric propulsion system to rendezvous with near-Earth asteroid and bring sample back is investigated. By dividing the mission into five segments, the complex mission is solved separately. Then different methods are used to find optimal trajectories for every segment. Multiple revolutions around the Earth and multiple Moon gravity assists are used to decrease the fuel consumption to escape from the Earth. To avoid possible numerical difficulty of indirect methods, a direct method to parameterize the switching moment and direction of thrust vector is proposed. To maximize the mass of sample, optimal control theory and homotopic approach are applied to find the optimal trajectory. Direct methods of finding proper time to brake the spacecraft using Moon gravity assist are also proposed. Practical techniques including both direct and indirect methods are investigated to optimize trajectories for different segments and they can be easily extended to other missions and more precise dynamic model.

关键词： sample return optimization gravity assist

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Rendezvous to asteroid with highly uncertain ephemeris: Hayabusa2’s Ryugu-approach operation result

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Astrodynamics 2020年第2期4卷 137-147页

作者： Yuichi Tsuda Hiroshi Takeuchi Naoko Ogawa Go Ono Shota Kikuchi Yusuke Oki Masateru Ishiguro Daisuke Kuroda Seitaro Urakawa Shin-ichiro Okumura Hayabusa2 Project Team Institute of Space and Astronautical Science Japan Aerospace Exploration AgencySagamihara252-5210Japan Research and Development Directorate Japan Aerospace Exploration AgencySagamihara252-5210Japan Research and Development Directorate Japan Aerospace Exploration AgencyTsukuba305-8505Japan Seoul National University Seoul08826Republic of Korea Okayama Observatory Kyoto UniversityAsakuchi719-0232Japan Japan Spaceguard Association Bisei714-1411Japan 不详

This paper describes the guidance and navigation technique used by Hayabusa2 for the asteroid rendezvous operation to reach *** operation results,including the achieved guidance and navigation performance,are also *** assessment and navigation teams worked closely to provide reliable navigation solutions with a short solution delivery *** the uncertainty of the Ryugu’s ephemeris was considerable before Hayabusa2’s arrival,a combination of radiometric-optical hybrid navigation and a stochastic-constrained optimum guidance method was able to achieve an accuracy of less than 100 m and 1 cm/s,and the arrival was precisely timed.

关键词： solar system exploration sample return optical navigation trajectory optimization spacecraft guidance

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Management innovation of Chang'e-5 project

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Frontiers of Engineering Management 2021年第4期8卷 620-626页

作者： Jizhong LIU Hao HU Zhaoyu PEI Qiong WANG Qiang MAI Lunar Exploration and Space Engineering Center(LESEC) Beijing 100190China Harbin Institute of Technology Harbin 150001China

1 Overview of Chang'e-5 project As the final step of the"three-step''development strategy(i.e.,orbiting,landing and sample returning)of the Chinese Lunar Exploration Program,the Chang,e-5 project aims to achieve moon surface sampling and retrieving for the first time in *** was initiated with the approval of the State Council in January 2011.

关键词： lunar exploration sample return systems engineering project management

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