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针对星敏感器地面实验室待定系数法标定的缺陷,提出了一种星敏感器标定误差修正方法以提高标定精度并根据实际标定数据进行了计算验证。基于星敏感器标定系统建立了标定理想模型。在用物理方法求得主点坐标的基础上,将焦距测量值代入星敏感器标定误差模型,只需考虑镜头畸变和像面旋转对星敏感器标定结果的影响。提出了标定误差的分步校正方法:先用径向畸变的一阶模型校正镜头畸变;再以标定理论值的中心水平线为基准,与实测值的拟合直线比较,求出实测直线与理论直线的夹角,依据点的旋转公式修正像面旋转引起的误差。某星敏感器实际标定数据表明:与待定系数法相比,该法不仅减小了标定误差大小而且改善了标定误差的均匀性。
Aiming at the defect of undetermined coefficient method of star sensor ground laboratory, a correction method of star sensor calibration error is proposed to improve the calibration accuracy and validate it based on the actual calibration data. The calibration ideal model was established based on the star sensor calibration system. On the basis of finding the coordinates of the main point by the physical method, the focal length measurement value is substituted into the star sensor calibration error model, only the effect of lens distortion and image rotation on the star calibration result is considered. A method of stepwise calibration of calibration error was proposed. The first-order model of radial distortion was used to correct the lens distortion. Based on the center line of the calibrated theoretical value, the measured straight line was compared with the theoretical straight line Of the angle, according to point rotation formula to correct the error caused by image rotation. The actual calibration data of a star sensor shows that compared with the undetermined coefficient method, this method not only reduces the size of the calibration error but also improves the uniformity of the calibration error.