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为了解决星敏感器星点质心定位中对过曝光星象的聚心问题,提出一种通用的星象聚心算法。采用先对局部星象区域进行初步计算,进而通过整体复合实现对所有星象的质心定位。首先,结合实拍星图介绍了想象的过曝光星象存在及区域分布;在分析其分布特性的基础上检测各行/列的过曝光区域尺度,根据与尺度相关的规则对相应点的灰度值进行空间缩放;然后利用质心平方加权法对缩放后的点值进行计算,得出局域的初步结果;进而结合过曝光区域的尺度对相应初步计算结果分配权值因子;最后,对全部结果进行复合得到最终结果。实验结果表明,采用提出的算法在全随机模拟情况下,当随机噪声强度达到30pixel时,对星象的聚心精度依然优于0.05pixel,能够满足实际应用中对聚心算法的精度和适应的要求。
In order to solve the problem of centroid over-exposure in centroid localization of star sensor, a universal algorithm of astrology is proposed. The initial calculation of the local astrological region is adopted firstly, and then the centroid localization of all the astrological signs is achieved through the integral compounding. First of all, the existence and distribution of the overexposed astronomical images are introduced based on real shots. Based on the analysis of their distribution characteristics, the overexposed areas of each row / column are examined. The gray values of the corresponding points And then use the center of mass centripetal weighted method to calculate the scaled point value to obtain the initial result of the local area; then, the weight coefficient is assigned to the corresponding preliminary calculation result according to the scale of the overexposed area; finally, all the results are combined Get the final result. Experimental results show that when the stochastic noise is less than 0.05pixel and the stochastic noise is 30 pixels, the proposed algorithm can better meet the accuracy and adaptability of the centripetal clustering algorithm .