InSAR干涉图的矢量分离式小波滤波

Filtering for InSAR Interferograms by Vector Decomposing and Wavelet Transformation

提出了一种新的InSAR干涉图滤波方法,并提出采用滤波前后干涉相位的均方差来进行滤波精度评价的策略。对不同类型的多幅干涉图进行了滤波实验,结果表明,本文滤波方法效果较好,精度较高。

A new filtering algorithm for InSAR interferogram is proposed. First, the raw intergerogram is mapped to unit vectors. Then the vectors are decomposed to two parts： the sine signal and the cosine one. Secondly, the sine and the cosine signals are filtered by wavelet threshold method. Finally, the filtered interferogram is calculated by the filtered sine and cosine signals. In order to evaluate the precision of filtering, a new evaluation method is presented, which uses the RMS of the phases between interferograms before and after filtering. Different types of interferograms are employed in experiments. The results show that the proposed filtering method is valid.