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New applications of non-linear chirp scaling in SAR data processing

This paper presents a nonlinear chirp scaling in processing monostatic and bistatic SAR data. When the effects of quadratic range migration are negligible, a time domain range cell migration correction can be applied. After the correction, the FM rates of targets confined in a range gate will differ from each other. A nonlinear chirp perturbation function can be applied to each range gate to equalize the targets' FM rates before azimuth compression.