满足夫琅和费远场条件的两个物体，z值大的物体将被环数少的菲涅耳波带板扫描，具有小而平直的孪生像噪声振幅；
In the far-field, the further object scanned by FZP with fewer fringes has flatter and lower amplitude of twin-image noise for reconstructed image.
同时研究了噪声对关联维数计算结果的影响，并提出用采样迭代奇异值降噪算法对原始数据进行降噪处理。
The influence of noise on the computational precision of correlation dimension is discussed, and iterative singular value decomposition for reducing noise is introduced.
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