星点图像超精度亚像元细分定位算法的研究

在CCD星敏感器中,星点图像质心定位的准确性影响星图识别的正确性,也决定了星敏感器测量的有效性。质心法是星点质心亚像元定位的传统方法,然而,它存在系统误差和随机误差。分析了误差产生的原因。在传统质心法的基础上提出了采用二元线性插值和自适应质心窗来改善信噪比,并对误差进行校正,实验证明了它比传统的质心法有更高的精度。

Research of hyper accuracy subpixel subdivision location algorithm for star image

For star sensors in CCD, the accuracy of centroid location for star image affects star map identification and determines the effectiveness of measurement. The centroid algorithm is the traditional method for subpixel location,but it is shown that exist a systematic error and a random one. In this research, an analytical study of error was introduced, and the error correction means by bilinear interpolation and adaptive centroid window was described. The experiments showed that the accuracy of this algorithm is better than the traditional centroid algorithm.