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Study on time domain reconstruction from non-uniform azimuth sampling in SAR signal

Wide-swath and high-resolution impose contradicting requirements on synthetic aperture radar (SAR) system design and parameters choice. To solve non-uniform sampling in the azimuth in the displaced phase centers multiple azimuth beams (DPCMAB) system, the time domain reconstruction algorithm based on the generalized sampling theorem is proposed, and a set of analytical formulas on the quadruple channels DPCMAB system is derived in detail. In addition, the performances and computational complexity of this algorithm are discussed. Theoretical analysis and simulation results show that the time domain reconstruction algorithm can eliminate the spurious image from non-uniform sampling and suppress paired echo below -60 dB.