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      A Non-linear Scaling Algorithm Based on chirp-z Transform for Squint Mode FMCW-SAR

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          Abstract

          A non-linear scaling chirp-z imaging algorithm for squint mode Frequency Modulated Continuous Wave Synthetic Aperture Radar (FMCW-SAR) is presented to solve the problem of the focus accuracy decline. Based on the non-linear characteristics in range direction for the echo signal in Doppler domain, a non-linear modulated signal is introduced to perform a non-linear scaling based on chirp-z transform. Then the error due to range compression and range migration correction can be reduced, therefore the range resolution of radar image is improved. By using the imaging algorithm proposed, the imaging performances for point targets, compared with that from the original chirp-z algorithm, are demonstrated to be improved in range resolution and image contrast, and to be maintained the same in azimuth resolution.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 March 2012
          : 1
          : 1
          : 69-75
          Affiliations
          [1 ] ①(Institute of Electronics, Chinese Academy of Science, Beijing 100190, China) ②(Graduate University of the Chinese Academy of Science, Beijing 100039, China)
          [2 ] ①(Institute of Electronics, Chinese Academy of Science, Beijing 100190, China)
          Article
          2caa991c6a054fb2ac3093b0585f1648
          10.3724/SP.J.1300.2012.20005

          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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