由于恒星具有很高的姿态精度, 使得观星标定成为星敏感器相机参数标定中不可缺少的一种方法.针对高阶非线性畸变情况下的星敏感器相机参数标定问题进行研究, 基于星间距的不变性建立了一个两步标定模型.设计了一个紧致的递归均值滤波器来进行参数估计, 该滤波器可以在不显著增加计算量的情况下提高参数估计的精度.实验结果表明, 相比已有方法, 所提出的方法能够实现更高精度的星敏感器相机标定.

With the high accuracy of the stellar angular positions, the camera calibration with the night sky observation is available and indispensable. In order to estimate the camera parameters even with higher order nonlinear distortions, a two-step model and the corresponding iterative optimization based on the invariability of inter-star angle were developed in this paper. Furthermore, a compact recursive average filter was designed to improve the accuracy while not adding significantly computation time. The experimental results demonstrated that the proposed model can implement star tracker camera calibration with higher accuracy than the known method.