Processing spotlight SAR data without azimuth oversampling in range migration algorithm

In applying the Range Migration Algorithm (RMA) to process spotlight SAR data, the data has to be oversampled in azimuth. A novel post-processing algorithm is introduced here to eliminate the oversampling. It involves removing the bulk of the azimuth compression and re-focusing the targets using a SPECAN type approach. Some localized artifacts exist but they can be removed by an additional processing step in generating a complimentary image. Point target experiments were successfully performed to verify the algorithm