We present an approach for minimising the effects of Radio Frequency Interference (RFI) on wideband Synthetic Aperture Radar (SAR). The method, which will be referred as SIR (Selective Iterative Reconstruction), works well in urban environment, where power level of RFIs often far exceeds the power level of the SAR echo signal. The urban terrestrial transmitters discussed here include TV broadcasts, FM radio stations, land mobile transmitters and public services such as paging and emergency operators. The SAR signal used is the common wideband, linear chirp. The SAR system uses a dechirp-on-receive setup prior to digitization. Our approach aims to improve the Signal-to-Noise ratio by fast non-statistical filtering and iterative reconstruction of the target signal distorted by the filtering. In the advent of faster DSPs dedicated to performing Fast Fourier Transforms, we believe that our method could eventually meet real-time RFI suppression requirements.
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