Journal of Systems Engineering and Electronics ›› 2010, Vol. 32 ›› Issue (7): 1394-1398.doi: 10.3969/j.issn.1001506X.2010.07.010

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Non-linear rangeDoppler algorithm for FMCW SAR

DONG Yongwei1,2, LIANG Xingdong1, DING Chibiao1   

  1. (1. National Key Laboratory of Microwave Imaging Technology, Inst. of Electronics, Chinese Academy of Sciences, Beijing 100190, China；
    2. Graduate Univ. of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2010-07-20 Published:2010-01-03

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Abstract:

The limiting factor to the range resolution of frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) is the wellknown presence of nonlinearities in the transmitted signal. The impact of nonlinearities in FMCW SAR is investigated, and the characteristics of beat signal are analyzed. Based on the model of FMCW SAR echo with nonlinearities, a proper improved rangeDoppler algorithm is proposed. This algorithm solves the nonlinearities problem for the whole range profile through one nonlinear filter. With the characters of low computation load and high processing precision, it is suitable for the dechirped FMCW SAR realtime imaging. And the feasibility of the presented method is demonstrated by the simulation.

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