

FOLLOWUS
China Academy of Launch Vehicle Technology, Beijing 100076, China
Beijing Aerospace Automatic Control Institute, Beijing 100854, China
GNC Systems Department, DLR Institute of Space Systems, Bremen 28001, Germany
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
Zheng-yu SONG, E-mail: zycalt12@sina.com
Received:31 August 2019,
Revised:2020-;3-;1,
Published Online:14 March 2020,
Published:2020-05
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Zheng-yu SONG, Cong WANG, Stephan THEIL, et al. Survey of autonomous guidance methods for powered planetary landing[J]. Frontiers of Information Technology & Electronic Engineering, 2020, 21(5): 652-674.
Zheng-yu SONG, Cong WANG, Stephan THEIL, et al. Survey of autonomous guidance methods for powered planetary landing[J]. Frontiers of Information Technology & Electronic Engineering, 2020, 21(5): 652-674. DOI: 10.1631/FITEE.1900458.
本文总结了天体表面精确软着陆的自主制导方法。首先回顾了动力下降制导方法的发展,重点介绍了其在约束处理和提升计算效率方面的贡献。随着对可重复使用运载器需求的不断增加,以及太空探索带来更多的科学回报,定点软着陆成为一项基本要求。不同于过去任务中公里级的着陆精度,未来行星着陆器在满足全部速度和姿态约束条件下,着陆位置精度要达到10米级,这项任务的困难引起学者对自主制导方法的兴趣。本文讨论了动力下降阶段一般性的3自由度和6自由度优化问题,并对比月球、火星和地球3种典型着陆场景的特点。在此基础上,通过比较解析制导方法、数值优化算法和基于学习的方法,详细阐述自主制导方法的特点和适应性,并讨论非凸问题的凸化处理和求解策略。随后提出自主制导方法工程应用的3个关键问题:物理可行性、模型精度和实时性。最后,简要介绍各国航天组织(包括美国、中国、法国、德国和日本)研发的垂直起降验证飞行器,以及目前在验证飞行器上开展的制导方法试验工作。
This paper summarizes the autonomous guidance methods (AGMs) for pinpoint soft landing on celestial surfaces. We first review the development of powered descent guidance methods
focusing on their contributions for dealing with constraints and enhancing computational efficiency. With the increasing demand for reusable launchers and more scientific returns from space exploration
pinpoint soft landing has become a basic requirement. Unlike the kilometer-level precision for previous activities
the position accuracy of future planetary landers is within tens of meters of a target respecting all constraints of velocity and attitude
which is a very difficult task and arouses renewed interest in AGMs. This paper states the generalized three- and six-degree-of-freedom optimization problems in the powered descent phase and compares the features of three typical scenarios
i.e.
the lunar
Mars
and Earth landing. On this basis
the paper details the characteristics and adaptability of AGMs by comparing aspects of analytical guidance methods
numerical optimization algorithms
and learning-based methods
and discusses the convexification treatment and solution strategies for non-convex problems. Three key issues related to AGM application
including physical feasibility
model accuracy
and real-time performance
are presented afterward for discussion. Many space organizations
such as those in the United States
China
France
Germany
and Japan
have also developed free-flying demonstrators to carry out related research. The guidance methods which have been tested on these demonstrators are briefly introduced at the end of the paper.
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