吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (01): 264-269.doi: 10.13229/j.cnki.jdxbgxb201401043

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Modified OMEGA-K imaging algorithm for bistatic SAR based on MSR 2D spectrum

LIU Yu-chun1,2, WANG Jun1, ZHANG Ge-ge1   

  1. 1. National Key Laboratory of Radar Siganl Processing, Xidian University, Xi'an 710071, China;
    2. Department of Physics and Electronic Engineering, Zhoukou Normal University, Zhoukou 466001, China
  • Received:2012-08-08 Online:2014-01-01 Published:2014-01-01

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Abstract:

A modified OMEGA-K imaging algorithm is proposed to reduce the computational complexity of the Method of Series Reversion (MSR) 2D point target spectrum for the bistatic Synthetic Aperture Radar (SAR). By performing the cancellation of the high order term of range history in range-frequency azimuth-time domain, 2D point target spectrum can be matched with low order Taylor expansion of echo signal, so that the focused imaging can be achieved by the OMEGA-K algorithm. The simulation results indicate that the modified OMEGA-K for range history approximated by second order Taylor expansion can achieve better focused performance than that of conventional algorithm for range history approximated by second order Taylor expansion, and approach the performance of the conventional algorithm for range history approximated by three order expansion. This demonstrates that the proposed algorithm has a good focusing performance by low order Taylor expansion, thus lowers the computational complexity.

Key words: communication, bistatic synthetic aperture radar, imaging algorithm, OMEGA-K

CLC Number: 

  • TN957.52

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