Imaging algorithm for highly squinted SAR data processing based on phase disturbing

For quick look imaging, a phase disturbing algorithm (PDA) for focusing synthetic aperture radar (SAR)subaperture data acquired at a high squint angle is proposed. First, the signal model is addressed and then the range processing and azimuth processing are analyzed in detail. The PDA performs the linear range walk correction (LRWC) in the time domain and the range cell curvature correction (RCCC) in the frequency domain to mitigate the range-azimuth coupling. Additionally, a disturbing phase is introduced in the frequency domain to remove the variation of the Doppler chirp rate with the azimuth position caused by LRWC in the time domain,and so an identical reference function can be employed in azimuth processing. Simulated results and raw data processing validate the effectiveness of the proposed algorithm.