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      FPGA Implementation of a SAR Two-dimensional Autofocus Approach

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          Abstract

          For real-time autofocus of defocused images produced by Synthetic Aperture Radar (SAR), the twodimensional autofocus approach proposed in this study is used to correct the residual range cell migration and compensate for the phase error. Next, a block-wise Phase Gradient Autofocus (PGA) is used to correct the space-variant phase error. The Field-Programmable Gate Array (FPGA) design procedures, resource utilization, processing speed, accuracy, and autofocus are discussed in detail. The system is able to autofocus an 8K × 8K complex image with single precision within 5.7 s when the FPGA works at 200 MHz. The processing of the measured data verifies the effectiveness and real-time capability of the proposed method.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 August 2016
          : 5
          : 4
          : 444-452
          Affiliations
          [1 ] ①(College of Electronic & Information Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China)
          [2 ] ①(College of Electronic & Information Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China) ②(Radar Imaging & Microwave Photonics Technology Key Laboratory of Ministry of Education, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China)
          Article
          0bee4f48e1d34818a9389ea6b2fec2ad
          10.12000/JR15092

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

          Categories
          Technology (General)
          T1-995

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