大视场角相机星图快速识别方法  

Fast Star Map Recognition Method of Camera with Large Viewing Angle

作　　者：张潇鹤 董明利[1,2] 孙鹏[1,2] 刘其林 Zhang Xiaohe;Dong Mingli;Sun Peng;Liu Qilin(School of Instrument Science and Optoelectronic Engineering,Beijing Information Science and Technology University,Beijing 100192,China;Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science and Technology University,Beijing,100192,China;College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [3]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与光电子学进展》2023年第22期89-94,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51475046);北京市教委科技计划重点项目(KZ201711232029);北京信息科技大学促进内涵发展科研水平提高项目(2020KYNH223)。

摘　　要：采用摄影测量方法对航天器天线面形进行在轨高精度测量,需对大视场角相机内外参数进行实时在轨标定。恒星可作为不变基准辅助在轨相机标定,但需对所拍星图中的星点进行识别得到其星点矢量信息。提出了一种针对大视场角相机所拍星图的快速识别方法:首先,结合标定结果的星图识别策略,提高匹配准确性;然后,基于四颗星星间角距的标签搜索匹配方法,将复杂度减小至线性,实现快速准确匹配;最后,基于反投误差分析的匹配检验方法,避免误识别。实测实验表明:对采集到的2000张星图进行识别,相比于传统三角形星图识别算法,所提方法兼顾了识别速度和识别率,识别率达到99.5%,识别时间减少75%,证明此方法合理有效,可节省存储空间,提高星图识别速度,提高星图识别率,具有很好的实用价值。It is necessary to calibrate the internal and external parameters of a camera with a large field of view in real time to measure the antenna profile of spacecraft with high accuracy in orbit via photogrammetry.In this paper,a fast recognition method for star map captured using a camera with a large viewing angle is presented.First,a star map recognition strategy combining calibration results is proposed to improve the matching accuracy.Next,a tag search and matching method based on the angular distance between four stars is proposed,which reduces the complexity to linearity and achieves fast and accurate matching.Finally,a matching test method based on back-casting error analysis is proposed to prevent false identification.The experimental results show that compared with the traditional algorithm,the method reflects both the recognition speed and recognition rate.The recognition rate reaches 99.5%,and the recognition time is reduced by 75%.This study demonstrates that the proposed method is reasonable and effective,can save storage space,improve the recognition speed and rate of star maps,and has a good practical value.

关 键 词：大视场角相机 相机内外参数 畸变校正 快速星图识别 在轨标定 

分 类 号：O439[机械工程—光学工程]