Narrow-band interference suppression method in multichannel SAR based on beamforming technique and sparse recovery

The problem of multichannel synthetic aperture radar image recovery in the presence of sidelobe narrow-band interference (NBI) is addressed. The NBI steering matrix is accurately estimated with the interference signal received in the passive mode. A beamforming technique is then utilised to minimise the energy loss of the target echoes and suppress NBI to a satisfactory level. By establishing a linear model for the signal with interference removed, the radar image is reconstructed via sparse recovery. The experimental results demonstrate that the proposed method can both suppress NBI effectively and generate high resolution images.