针对星相机在轨因卫星运动和曝光时间设定的动态条件引起的星点模糊导致星点提取精度下降的问题, 提出一种动态星点坐标确定误差补偿方法, 利用在星相机光学系统入瞳前加入阶梯玻璃的手段实现了提高星相机摄星指向精度的目的。地面标定和在轨测试表明, 星相机指向精度优于1″, 验证了该方法的有效性, 具有一定的应用价值。

In order to solve the problem that the precision of star point extraction decreases due to the blurring of star points caused by satellite motion and exposure time under the dynamic conditions of star camera in orbit, a compensation method for the error of dynamic star point coordinate determination is presented in this paper. The purpose of improving star pointing accuracy of star camera is realized by adding step glass before the entrance pupil of star camera optical system, instead of relying on complex centroid extraction algorithm. Through ground calibration and onorbit test,the pointing accuracy of the star camera is better than 1″, verifing the effectiveness of this method.