摘要
针对卷帘曝光模式星敏感器动态星点成像形状畸变和成像位置误差导致的导航星点定位精度降低、测姿误差增大的问题,提出了一种基于时域约束的导航星点校正方法。基于卷帘曝光的时间异步性特点,结合基于卡尔曼滤波的导航星点位置和帧间速度最优估计,将时域中不同时刻的导航星点校正到相同时刻,从而有效地解决星点畸变与位置偏移问题。展开了不同条件下的仿真实验,实验结果表明:当星敏感器角速度在0~3°/s动态范围内,校正后星对距离精度高于0.1 pixels,姿态角精度高于10″。
Aiming at the problems of reduced navigation star points positioning accuracy and increased attitude error caused by dynamic star points imaging shape distortion and imaging position error of the star tracker in the rolling exposure mode,a navigation star points correction method based on time domain constraints is proposed.Based on the time asynchronous characteristics of rolling shutter exposure,combined with the optimal estimation of navigation star points positions and inter-frame velocity based on Kalman filter,the navigation star points at different moments in the time domain are corrected to the same time,thereby effectively solving the problem of star points distortion and position offset.The simulation experiments under different conditions were carried out.The experimental results show that when the angular velocity of the star sensor is within the dynamic range of 0~3°/s,the distance accuracy of the star pair after correction is higher than 0.1 pixels,attitude angle accuracy is higher than 10".
作者
何隆东
赵汝进
马跃博
侯娅贤
朱自发
曾思康
HE Longdong;ZHAO Rujin;MA Yuebo;HOU Yaxian;ZHU Zifa;ZENG Sikang(Institute of Optics and Electronics of the Chinese Academy of Sciences,Chengdu 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement,Chinese Academy of Sciences,Chengdu 610209,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2021年第3期128-139,共12页
Acta Photonica Sinica
基金
国家自然科学基金(No.61501429)
中国科学院青年创新促进会资助项目(No.2016335)
国家重点研发计划(No.2019YFA0706001)。
关键词
星敏感器
卷帘曝光
时域约束
星点校正
卡尔曼滤波
Star tracker
Rolling shutter
Time domain constraint
Navigation stars correction
Kalman filter
