Range migration algorithm with resampling in airborne bistatic spotlight SAR systems

To obtain the SAR images with high quality in the processing of the airborne bistatic spotlight SAR systems in the spatial variant case, we propose a modified range migration algorithm (RMA) with resampling based on the extended Taylor approximation (ETA). After we analyze the azimuth positions of the transmitter and the receiver in the spatial variant case, we compensate the difference of the transmitter velocity and the receiver velocity at the mixing stage of the raw data and the reference signal. Then, the validity of the proposed algorithm is tested with some numerical simulations via a pulsed spotlight SAR simulator.