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      SAR Imaging of Moving Target based on Knowledge-aided Two-dimensional Autofocus

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          Abstract

          Due to uncertainty on target's motion, the range cell migration (RCM) and azimuth phase error (APE) of moving targets can't be completely compensated in synthetic aperture radar (SAR) processing. Therefore, moving targets often appear two-dimensional (2-D) defocused in SAR images. In this paper, a 2-D autofocus method for refocusing defocused moving targets in SAR images is presented. The new method only requires a direct estimate of APE, while the residual 2-D phase error ( or RCM) is computed from the estimated APE by exploiting the analytical relationship between the 2-D phase error ( or RCM) and APE. Because the parameter estimation is performed in the reduced-dimension space by exploiting prior knowledge on phase error structure, the proposed approach offers clear advantages in both computational efficiency and estimation accuracy.

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          Author and article information

          Journal
          08 July 2015
          Article
          1507.02150

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          11 pages, 5 figures
          cs.IT cs.CV math.IT

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