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Resolution-Preserving Two-Look Despeckling of SAR Images

An improved two-look processing is presented to despeckle synthetic aperture radar (SAR) images. The azimuth spectrum is halved after a constant phase is removed. Each half is extrapolated conjugate symmetrically to form a full-band azimuth spectrum, and the full-band azimuth spectrum is used to generate a look. Then, the two looks are averaged incoherently to obtain a two-look image. In this algorithm, not only the speckle is suppressed but also the resolution is preserved