A Nonlinearity Measurement Method for Frequency-Modulated Continuous Wave Synthetic Aperture Radar Imaging

  • Wen Yu
  • Siwei Zhao
  • Xiaoquan Song
  • Yueqing Gao
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 238)


One crucial limiting factor to the use of frequency-modulated continuous wave synthetic aperture radar (FMCW SAR) sensors is the well-known presence of frequency nonlinearities in the transmitted signal, which highly deteriorates the range resolution because of the pair-echo effect. By analyzing the FMCW SAR nonlinear signal model, a novel nonlinearity measurement method is proposed based on the time-shift characteristic of the Fourier transform. With the accurate estimation of the nonlinearity term, the modified frequency scaling algorithm is applied with nonlinearity correction to complete the imaging process. The validity of the proposed algorithm is demonstrated with multi-point targets simulation, confirming its superiority in terms of resolution, PSLR, ISLR, and final focused images.


Synthetic Aperture Radar Image Linear Frequency Modulation Frequency Nonlinearity Nonlinearity Correction Original Frequency 
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Wen Yu
    • 1
  • Siwei Zhao
    • 1
  • Xiaoquan Song
    • 1
  • Yueqing Gao
    • 2
  1. 1.Beijing Institute of Tracking and Telecommunications TechnologyBeijingChina
  2. 2.Chinese Electronic Technology Group Corporation 54th Research InstituteBeijingChina

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