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COMPARISON AMONG METHODS OF FILTERING AND PHASE UNWRAPPING FOR SAR INTERFEROGRAM
SAR干涉图滤波与相位解缠算法比较研究

Keywords: SAR,filtering,phase unwrapping,LP-norm,branch cut method
雷达干涉测量
,滤波,相位解缠,LP范数,枝切法

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Abstract:

On the basis of the framework of LP-norm, the mathematic model of classic phase unwrapping methods is studied. Phase unwrapping methods are classed into three types. The topographic SAR interferogram in Bam region of Iran is analyzed with these phase unwrapping methods.The results show that the Goldstein filtering method can improve effectively the distribution of residuals and branch cuts and raise the visual effects of the interferogram as well as the ratio of signal to noise. The L1-norm methods based on network currents can achieve an optimal resolving, but the efficiency is rather low, the L2-norm method can obtain better optimal resoloring and has better efficiency, L0-norm algorithm performed best in efficiency, but with discontinuity and uncertainty.

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