Processing simulated RADARSAT SAR data with squint by a high precision algorithm

A key step in the differential range deramp (DRD) algorithm in SAR processing is to use the linear-FM property of the range chirp to differentially shift the range energy as a function of azimuth frequency. The remaining bulk range cell migration correction (RCMC) can then be done in the two-dimensional frequency domain. When the azimuth FM rate parameter is range invariant, the deramp function is linear frequency modulated. In practice, this parameter is a function of range. The deramp function is modified to accommodate this range variance of the azimuth FM rate parameter. Experiments were performed with simulated RADARSAT SAR in realistic situations, and with squint. This paper focuses on presenting the experimental results