高分五号卫星星敏感器在轨测量精度评估

Accuracy Evaluation of Star Sensors Onboard GF-5 Satellite

遥感卫星对姿态测量精度要求严格。星敏感器作为卫星姿态测量的主要敏感器,需要对其在轨测量精度进行评估。基于高分五号卫星3台星敏感器的在轨测量数据,计算各光轴的惯性指向及三者之间的夹角,根据夹角变化特性来评估星敏感器的高频(NEA)、低频(LFE)动态测量精度。此外,由于3台星敏感器指向不同,计算光轴惯性指向前对各自的光行差进行了修正,确保测量精度评估的准确性。研究成果对于遥感卫星的姿态确定具有一定参考价值。

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-5satellite,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.