Low-Frequency Attitude Error Compensation for the Jilin-1 Satellite Based on Star Observation

被引：9

作者：

Guan, Zhichao ^{[1
]}

Zhang, Guo ^{[1
]}

Jiang, Yonghua ^{[2
]}

Shen, Xin ^{[1
]}

机构：

[1] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & Re, Wuhan 430079, Peoples R China

[2] Wuhan Univ, Sch Remote Sensing & Informat Engn, Wuhan 430079, Peoples R China

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2023年 / 61卷

基金：

中国国家自然科学基金;

关键词：

Stars; Satellites; Cameras; Orbits; Optical imaging; Adaptive optics; Optical sensors; Camera; Jilin-1; low-frequency attitude error; star control points (SCPs); star observation; star tracker; GEOMETRIC CALIBRATION; ACCURACY; QUALITY; SENSOR;

D O I：

10.1109/TGRS.2023.3274952

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Owing to changes in the space thermal environment, the optical axis angle between the camera and star tracker (Cam-ST) changes as well, resulting in regular low-frequency attitude errors and a decline in the geometric positioning accuracy of the images. In this study, a star-observation-based low-frequency attitude error correction method is proposed. First, the star was used as the control point to be observed by satellite from different latitudes in an orbit. The star information is extracted using a priori attitude to obtain the camera pointing in inertial coordinates. Second, combined with the optical axis pointing value of the star tracker, the angle change between the camera and two star trackers (Cam-2STs) was calculated. A polynomial model was used to fit the angle change, and the fitting model and camera optical axis pointing compensation (COAPC) algorithm were used to compensate for the camera optical axis. Third, the regular low-frequency attitude error of the camera was realized. The experiment used 20 groups of star observation data from two missions of the Jilin-1 07 video satellite. After compensation, the camera pointing maximum root mean square error (RMSE) was reduced from 30.08 '' to 7.70 '' , the X -axis attitude error was reduced from 13.26 '' to 7.09 '' , and the Y -axis from 29.48 '' to 7.36 '' . The geometric positioning accuracy of Jilin-1 ground images was 25.63 m after correction. The experimental results showed that the proposed method effectively improved the attitude measurement accuracy. This method can thus effectively improve the direct geometric positioning accuracy of a single image.

引用

页数：17

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