一种多帧相关滤波的星敏感器像素非均匀性误差校正方法

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.

A Correction Method of Non Uniformity Pixel Error Applied to Star Sensor Based on Multi Frame Correlation Filtering

In order to further improve star positioning precision of star sensor, the pixel error source and formation mechanism are analyzed.Based on multi frame correlation filtering, a correction method of non uniformity pixel error applied to star sensor is proposed. Star centroiding field and local correction field are determined according to the position of star. The information of current frame star map and former frame local correction filed are utilized to predict the current frame local correction field. Corrected star centroiding filed can be obtained by difference method. Experimental results show that non uniformity noise can be predicted and positioning accuracy is improved better by proposed method, which is also with good robustness.