A novel subband fusion method for SAR echo combined with compressed sensing

In this paper, a novel sub-band fusion technique for SAR echo using compressed sensing was proposed. As we all known, high resolution and wide swath are the trend of SAR systems, while the range resolution of SAR is limited by the bandwidth of transmitted signal. Our proposed algorithm aimed to take the compressed sensing and sub-band fusion into the SAR systems, realize high resolution and reduce the amounts of SAR conveyed data. Internal calibration was used to extract the phase error from each channel. And Orthogonal Matching Pursuit algorithm was used for range signal recovery. After coherent processing, we can acquire ultra-wide bandwidth echo. And finally, refined range Doppler algorithm was employed for range cell migration correction and azimuth compression. We proved the proposed algorithm used the fusion experiment at the end of the paper.