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It is feasible to obtain multibaseline InSAR data with repeat passes of existing single-baseline InSAR systems. Due to high coherence, the single-pass pair of SAR images can be accurately aligned using existing methods. However, there exist great difficulties in alignment of multiple-pass SAR images. Fortunately, repeat-pass interferograms are corresponding to the same terrain, i.e., DEM (Digital Elevation Model). Hence the interferograms are coherent, even if the SAR images are decorrelated completely. From this point, this paper proposes an innovative strategy to align the interferograms rather than the SAR images. Since the interferograms generated by different effective baseline are not identical, this paper proposes a new method to align interferograms by local frequency estimation. Finally, the computer simulation results show that the proposed method can align interferograms accurately. Keywords-synthetic aperture radar interferometry(InSAR); Digital Elevation Model(DEM); multibaseline; local frequency estimation

Aligning Interferograms from Single-baseline InSAR by Local Frequency Estimation