14 December 1999 Fast method for unwrapping InSAR raw interferogram
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A new method, Multiple Phase Method (MPM), is proposed for fast unwrapping InSAR raw interferogram. The unwrapping process is regarded as one of phase adding or subtracting (lifting) processes when 2-pi phase jump is detected. The proposed method MPM distinguishes the phase jump from noise in the raw interferogram by using the original and its pi phase shifted interferograms. MPM removes the phase jump from the lifting operation by switching the difference data from the original interferogram to the phase shifted one or from the shifted one to the original when the phase jump is detected. The phase jump is detected using a simple mask operation. The phase integration is carried out by using new index 'confidence' derived from the coherence as a guide to select the integration path. MPM selects the integration path from higher confidence region to lower ones. As residues have locally minimum coherence, MPM does not pass through them. The proposed method MPM was successfully applied to an actual pair of ERS-1 SAR single look complex images.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiroshi Hanaizumi, Masaki Kagawa, Sadao Fujimura, "Fast method for unwrapping InSAR raw interferogram", Proc. SPIE 3871, Image and Signal Processing for Remote Sensing V, (14 December 1999); doi: 10.1117/12.373244; https://doi.org/10.1117/12.373244

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