Journal of Systems Engineering and Electronics ›› 2010, Vol. 32 ›› Issue (4): 740-744.

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Method of super resolution imaging for ISAR based on estimation theory

CHEN A-lei1, WANG Dang-wei2, MA Xiao-yan2, SU Yi3   

  1. (1. Dept. of Graduate Management, Air Force Radar Academy, Wuhan 430019, China;
     2. Dept. of Air/Spacebased Early Warning Surveillance Equipment, Air Force Radar Academy, Wuhan 430019, China; 
    3. School of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
  • Online:2010-04-23 Published:2010-01-03

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Abstract:

Aiming at the difficult problem that the mainlobe resolution compressed by matched filtering changes with the range between equivalent array and radar when the length of the synthetic aperture is given, a new method of super resolution imaging based on least-mean-square estimation theory is proposed, which is based on the theory of linear systems and the equivalent model of target's echo signals in azimuth. Different from the traditional super resolution imaging method which is based on spectrum estimation, this one uses the estimated signal of the target's impulse response system in azimuth, and as a result it can completely eliminate the impact of the range between equivalent array and radar on the resolution in azimuth. Simulation experiment proves the effectiveness of the method.

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