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      Impact of Earth’s Oblateness Perturbations on Geosynchronous SAR Data Focusing

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      Journal of Radars

      Chinese Academy of Sciences

      Geosynchronous SAR (GEOSAR), Orbital perturbation, SAR imaging

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          Abstract

          In this study, we focus on the ultra-long integration of orbital perturbations of geosynchronous Synthetic Aperture Radar (SAR) for imaging. By deriving mathematical expressions for the Doppler rate and quadratic phase from orbital elements perturbated by oblateness or the J2 term of the non-spherical gravitational force of the Earth, we analyze the impact on SAR data focusing. Based on our results, we conclude that the quadratic phase will exceed 45°, which is the defocusing threshold for imaging, after accumulation during a long integration time at the minute level. Because the potential for defocusing exists throughout nearly the entire satellite motion cycle, the SAR processor must carefully manage and compensate for the quadratic phase to avoid image degradations.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 June 2016
          : 5
          : 3
          : 312-319
          Affiliations
          [1 ] ①(Institute of Electronics, Chinese Academy of Sicences, Beijing 100190, China) ②(Key Laboratory of Technology in GeoSpatial Information Processing and Application System, Chinese Academy of Sicences, Beijing 100190, China)
          Article
          86309eb4a9454869a7ee3f8bc0de459b
          10.12000/JR15121

          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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