| 小天体不规则度与光学导航质心提取及应用 |
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| 引用本文： | 崔平远,贾贺,朱圣英.小天体不规则度与光学导航质心提取及应用[J].宇航学报,2021,42(1):83-91. |
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| 作者姓名： | 崔平远 贾贺 朱圣英 |
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| 作者单位： | 1. 北京理工大学深空探测技术研究所，北京 100081；2. 深空自主导航与控制工信部重点实验室，北京 100081；
3. 飞行器动力学与控制教育部重点实验室，北京 100081 |
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| 基金项目： | 国家重点研发计划（2019YFA0706500）；国家自然科学基金（61873302，61973032）；基础科研（JCKY2018602B002，JCKY2019602D022）；民用航天预研项目 |
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| 摘 要： | 针对深空自主导航的小天体“形心和光心”提取问题，提出了小天体不规则度的概念，并给出了定义。小天体不规则度可以度量小天体形状和亮度的不规则程度，并作为不规则小天体质心提取方法的选取准则。首先提出了基于小天体不规则度的图像处理方法选取准则，进而针对形状不规则程度较大的小天体，提出一种基于最小外接图形的不规则小天体形心提取方法。最后，对基于不规则度的图像处理方法选择和形心提取算法进行了仿真。结果表明，不规则度很好地刻画了小天体不规则特性，选取准则可以实现算法的有效选取，实现小天体质心的高精度提取。
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| 关 键 词： | font-size:10.5pt '>小天体不规则度 质心提取 光学导航 图像处理 |
| 收稿时间： | 2020-09-27 |
Asteroid Irregularity Degree and Application in
Centroid Extraction of Optical Navigation |
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| CUI Ping yuan,JIA He,ZHU Sheng ying.Asteroid Irregularity Degree and Application in
Centroid Extraction of Optical Navigation[J].Journal of Astronautics,2021,42(1):83-91. |
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| Authors: | CUI Ping yuan JIA He ZHU Sheng ying |
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| Affiliation: | 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；3. Key Laboratory of
Dynamics and Control of Flight Vehicle, Ministry of Education, Beijing 100081,
China |
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| Abstract: | Aiming to address the problem of shape center and
optical center extraction of small bodies in deep space autonomous optical
navigation, the concept of asteroid irregularity degree (AID) is proposed and
defined in this paper. The AID is an index for evaluating the irregularity in
shape and luminance of small bodies and can be used as the selection criteria
for centroid extraction algorithms. The criteria for selecting centroid
extraction algorithms based on AID are proposed. Furthermore, for asteroids
with a large AID, an algorithm for extracting the shape center of irregular
asteroids based on minimum enclosing graphics (MEG) is proposed. The selection
method and centroid extraction algorithm based on AID are simulated, and the
results demonstrate that selection criteria can effectively identify the most
suitable algorithm for achieving high precision centroid extraction
of asteroids. In addition, the MEG algorithm improves the precision of centroid
extraction for irregularly shaped asteroids. As a result, the estimation
accuracy of navigation system can be improved. |
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| Keywords: | |
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