基于PPP/INS辅助的鱼眼相机快速星识别算法

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-06-13 DOI:10.1017/S0373463322000285

Chonghui Li, Yuanxi Yang, Guorui Xiao, Zhanglei Chen, Shuai Tong, Zihao Liu

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引用次数: 1

摘要

摘要180°视场鱼眼星敏感器是一种重要的姿态确定设备，能显著提高恒星的可见性。然而，由于标定精度不高，也给星识别带来了困难。为此，提出了一种结合精确点定位/惯性导航系统(PPP/INS)的鱼眼星识别算法。首先，根据PPP/INS的位置和姿态信息，结合鱼眼相机的畸变模型生成参考星图;然后在参考星点的特定邻域中提取星点。然后，根据角距误差对提取的星点进行单独测试和识别。最后，根据星id结果确定实时精确姿态。实验结果表明，当初始姿态误差小于1.5°时，在鱼眼星图中识别270 ~ 310颗恒星的平均时间为0.03 s，在PPP/INS的支持下，姿态确定精度优于10″。

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Rapid star identification algorithm for fish-eye camera based on PPP/INS assistance

Abstract The fish-eye star sensor with a field of view (FOV) of 180° is an important piece of equipment for attitude determination, which improves the visibility of stars significantly. However, it also brings the star identification (star-ID) difficulties because of imprecise calibrations. Thus, a fish-eye star-ID algorithm supported by the integration of the precise point positioning/inertial navigation system (PPP/INS) is proposed. At first, a reference star map is generated in combination with the distortion model of the fish-eye camera based on the position and attitude information from the PPP/INS. Then the star points are extracted in a specific neighbourhood of the reference star points. Subsequently, the extracted star points are individually tested and identified according to angular distance error. Finally, the real-time precise attitude is determined based on the star-ID results. Experimental results show that, 270–310 stars can be identified in a fish-eye star map with an average time of 0.03 s if the initial attitude error is smaller than 1.5° and an attitude determination accuracy better than 10″ can be achieved by support from PPP/INS.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.