Accuracy Evaluation of Star Sensors Onboard GF-5 Satellite

Remote sensing satellites require high-precision attitude measurement information.Star sensors,as the main sensors of satellite attitude measurement,need to evaluate their on-orbit measurement accuracy.In this paper,based on the on-orbit measurement data of three satellite sensors onboard GF-5 satellite,the inertial orientation of each optical axis and the angle between them are calculated,and the measurement accuracy of highfrequency(NEA)and low-frequency(LFE)information of the star sensors are evaluated according to the angle variation characteristics.In addition,due to the different orientations of the three satellites,the optical aberrations of the three satellites are corrected before calculating the inertial orientation of the optical axis to ensure the accuracy of the measurement accuracy evaluation.The research results are of great significance for attitude determination of remote sensing satellites.

Starting from the demand for high-precision attitude measurement by remote sensing satellites, this article proposes a method to evaluate the accuracy of one’s own in orbit measurement using quaternions output from star sensors. By combining orbit data to correct the optical deviation, the variation curve of the optical axis angle between the star sensor heads was obtained, and the accuracy of the star sensor in orbit measurement was identified using this data. The impact of brackets in LFE has not been quantitatively peeled off with effective data, and further research is needed from theoretical methods and engineering practices in the future.