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Volume 23 Issue 4
Apr.  2001
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Zheng Yiming, Bao Zheng. AN AUTOFOCUS ALGORITHM FOR SAR BASED ON RELAX[J]. Journal of Electronics & Information Technology, 2001, 23(4): 379-387.
Citation: Zheng Yiming, Bao Zheng. AN AUTOFOCUS ALGORITHM FOR SAR BASED ON RELAX[J]. Journal of Electronics & Information Technology, 2001, 23(4): 379-387.

AN AUTOFOCUS ALGORITHM FOR SAR BASED ON RELAX

  • Received Date: 1999-06-11
  • Rev Recd Date: 1999-12-01
  • Publish Date: 2001-04-19
  • An autofocus algorithm based on RELAX is presented. Assuming there exist multiple dominant scatterers in each range bin (other smaller scatterers are treated as clutter), the algorithm performs the phase error correction and the parameter estimation of the dominant scatterers alternatively by adopting an iterative procedure. The algorithm does not require that the clutter and noise in each range bin to be of certain distribution model, and it can be used to estimate all kinds of phase errors. Thus the algorithm is very robust. The results obtained in autofocusing experiments on real SAR/ISAR data show that the algorithm is very efficacious.
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  • W.G. Carrara, R. S. Goodman, R. M. Majewski, Spotlight Synthetic Aperture Radar Signal Processing Algorithms, Norwood, MA, Artecli House, 1995, Chapter 1. [2]G.A. Bendor, T. W. Gedra, Signal-pass fine-resolution SAR autofocus, Proc. of IEEE National Aerospace and Electronics Conference, NAECON, Dayton, Ohio, May 1983, 482-488.[2]T.M. Callway, G. W. Donohoe, Subaperture autofocus for synthetic aperture radar, IEEE Trans.on Aerospace and Electronic Systems, 1994, 30(2), 617-621.[3]C.C. Chen, C. Andrews, Target-motion-induced radar imaging, IEEE Trans. on Aerospace and Electronic Systems, 1980, 16(1), 2-14.[4]叶炜,逆合成孔径雷达运动补偿与成像研究,[博士论文],西安,西安电子科技大学,1996.[5]D.E. Wahl, P. H. Eichel, D. C. Chiglia, et al., Phase gradient autofocus--A robust tool for high resolution SAR phase correction, IEEE Trans. on Aerospace and Electronic Systems, 1994, 30(2), 827-834.[6]C.A. Snarski, Rank one phase error estimation for range-Doppler imaging, IEEE Trans. on Aerospace and Electronic Systems, 1994, 32(2), 676-688.[7]W. Ye, T. S. Yeo, Z. Bao, Weighted least square estimation of phase errors for SAR/ISAR autofocus, IEEE Trans. on Geoscience and Remote Sensing, 1999, 37(5), 2487-2495.[8]H.L. Chan, T. S. Yeo, Noniterative quality phase-gradient autofocus (QPGA) algorithm for spotlight SAR imagery, IEEE Trans. on Geoscience and Remote Sensing, 1998, 36(5), 1531-1538.[9]Li Liwei.[J].Asif Raza, Mao Shiyi, Improvement of rank one phase estimation (ROPE) autofocus technique, Proc. of the International Radar Symposium, IRS98, Munich, Germany, Vol. .1998,:-[10]张贤达,信号处理中的线性代数,北京,科学出版社,1997,283-287.[11]J. Li, P. Stoica, Efficient mixed-spectrum estimation with applications to target feature extraction, IEEE Trans. on Signal Processing, 1996, 44(2), 281-294.[12]Z.S. Liu, J. Li, Synthetic-aperture-radar motion compensation and feature extraction by means of relaxation-based algorithm, Journal of Opt. Soc. Am. A, 1998, A-15(3), 599-610.
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