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›› 2012, Vol. 29 ›› Issue (1): 136-140.DOI: 10.7523/j.issn.2095-6134.2012.1.020

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An improved focusing method for real time SAR

ZHANG Feng-Hui1,2,3, WANG Yan-Fei1   

  1. 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    2. Graduate University, Chinese Academy of Sciences, Beijing 100190, China;
    3. Institute of 804, Shanghai Aerospace Technology Academy, Shanghai 200101, China
  • Received:2010-06-07 Revised:2011-03-16 Online:2012-01-15

Abstract:

For practical SAR systems, the motion errors of radar platform lead to the azimuth phase history errors which lead to defocus images. We propose a modified autofocus method which applies the delay and remove algorithm for more effectively estimating the real phase history based on azimuth data. With this method a better focused image is achieved. The algorithm is efficient for real-time SAR system. The focus processing results of SAR measured data show that the proposed method is effective.

Key words: phase error, delay and remove algorithm, pulse integral, real time SAR autofocus, auto focus

CLC Number: