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Interferometric data processing (InSAR) for extraction of information about the Earth terrain heights is one of the general guidelines in development of contemporary space-based radar systems. The InSAR processing for building the digital elevation models (DEM) and terrain displacement maps includes a phase noise suppression step, which is usually performed by different image filters, as well as spectral and adaptive spectral filters (mean/boxcar, spectral domain filtration with different window functions, Wiener,...