A NEW METHOD OF WEIGHT CHOICE IN INSAR
LEAST SQUARES UNWRAPPING
Liu Weike1，2 and Liu Goulin11Geomatics College，Shandong University of Science and Technology，Qingdao 266510，China
【摘 要】Abstract:The de－coherence phenomena such as Low－SNR radar signal，shadows and layover caused by topography，etc．，causing phase data discontinuity，makes the result of unwrapping phase inaccuracy or even completely wrong．Based on the analysis of influencing factors to weight choice，this thesis develops a new method to choose the weights based on the measure of the confidence in the frequency domain．Experiments show that it could overcome the defect of sub－estimate to the slope of least squares method very well，which has a better rationale，stability and performance． 【期刊名称】大地测量与地球动力学（英文版） 【年(卷),期】2013(004)001 【总页数】6
【关键词】Key words:least squares phase unwrapping;de－coherence;phase quality areas;sub－estimate to the slope;weight
1 Introduction
The phase data of interferometry measurements of Synthetic Aperture Radar(InSAR)are restricted in a 2π modulus，in order to calculate the DEM，an integer multiple phase period needs to be added，which is
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