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为了进一步提升星敏感器的星点定位精度,分析星敏感器的像素误差来源和形成机理,提出一种多帧相关滤波的像素非均匀性误差校正方法.根据星图中星点的位置确定质心定位域和局部校正域,利用当前帧星图信息和前一帧的局部校正域信息预测当前帧的校正域,满足校正条件后采用差分法校正质心定位域.实验结果表明,本文方法能够较好地预测星图的非均匀性噪声,提升星点定位精度,具有较好的鲁棒性.
In order to further improve the star point positioning accuracy of the star sensor and analyze the source and formation mechanism of the pixel error of the star sensor, a method of pixel nonuniformity error correction based on multi-frame correlation filtering is proposed. According to the position of the star point in the star map, The localization domain and the local correction domain, the current domain frame information and the local correction domain information of the previous frame are used to predict the correction domain of the current frame, and then the difference method is used to correct the centroid localization domain after the correction condition is satisfied. The experimental results show that the method in this paper can be better To forecast the non-uniform noise of the star map, improve the positioning accuracy of the star point, and has good robustness.