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扩展目标夏克-哈特曼波前传感器(SH-WFS)子图像之间偏移量的计算是影响波前传感精度的关键,通常采用相关算法来实现,并通过抛物线插值达到亚像元精度。子图像间的相对偏移量计算也可采用频域相移量估算的方法进行计算,频域算法还可通过迭代进一步提高算法精度。对频域迭代算法进行了理论分析、仿真和实验研究,结果表明,频域迭代算法在信噪比高于4…1时,具有比抛物线插值法更高的计算精度;在信噪比较低时,与抛物线插值法精度相近。
Extended Target The calculation of the offset between SH-WFS sub-images is the key to the accuracy of the wavefront sensing. It is usually implemented using correlation algorithms and is achieved by parabolic interpolation of sub-pixels Accuracy. The relative offset between sub-images can also be calculated using the method of frequency-domain phase shift estimation, and the frequency domain algorithm can further improve the accuracy of the algorithm through iteration. The frequency domain iteration algorithm is theoretically analyzed, simulated and experimentally studied. The results show that the frequency domain iterative algorithm has higher computational accuracy than the parabolic interpolation method when the signal to noise ratio is higher than 4 ... 1; When, with the accuracy of parabolic interpolation similar.