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Effects of residual motion compensation errors on the performance of airborne along-track interferometric SAR

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Abstract

Two approximations, center-beam approximation and reference digital elevation model (DEM) approximation, are used in synthetic aperture radar (SAR) motion compensation procedures. They usually introduce residual motion compensation errors for airborne single-antenna SAR imaging and SAR interferometry. In this paper, we investigate the effects of residual uncompensated motion errors, which are caused by the above two approximations, on the performance of airborne along-track interferometric SAR (ATI-SAR). The residual uncompensated errors caused by center-beam approximation in the absence and in the presence of elevation errors are derived, respectively. Airborne simulation parameters are used to verify the correctness of the analysis and to show the impacts of residual uncompensated errors on the interferometric phase errors for ATI-SAR. It is shown that the interferometric phase errors caused by the center-beam approximation with an accurate DEM could be neglected, while the interferometric phase errors caused by the center-beam approximation with an inaccurate DEM cannot be neglected when the elevation errors exceed a threshold. This research provides theoretical bases for the error source analysis and signal processing of airborne ATI-SAR.

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Authors and Affiliations

  1. Institute of Electronics, Chinese Academy of Sciences, Beijing, 100190, China

    Hui Zhang, Jun Hong, Xiao-lan Qiu, Fang-fang Li & Feng Ming

  2. University of the Chinese Academy of Sciences, Beijing, 100190, China

    Hui Zhang

  3. Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Beijing, 100190, China

    Hui Zhang, Xiao-lan Qiu & Fang-fang Li

  4. Science and Technology on Millimeter-Wave Laboratory, Beijing, 100854, China

    Ji-chuan Li

Authors
  1. Hui Zhang
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  2. Jun Hong
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  3. Xiao-lan Qiu
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  4. Ji-chuan Li
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  5. Fang-fang Li
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  6. Feng Ming
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Correspondence to Hui Zhang.

Additional information

Project supported by the National Natural Science Foundation of China (Nos. 61331017 and 61401428)

ORCID: Hui ZHANG, http://orcid.org/0000-0002-4304-0411

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Zhang, H., Hong, J., Qiu, Xl. et al. Effects of residual motion compensation errors on the performance of airborne along-track interferometric SAR. Frontiers Inf Technol Electronic Eng 17, 1095–1106 (2016). https://doi.org/10.1631/FITEE.1500311

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  • DOI: https://doi.org/10.1631/FITEE.1500311

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