An improved method of the minimum entropy for refocusing the moving target image in the SAR observation

Chen Yi; Jin Yaqiu

Volume 25 Issue 2

Feb. 2003

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Chen Yi, Jin Yaqiu. An improved method of the minimum entropy for refocusing the moving target image in the SAR observation[J]. Journal of Electronics & Information Technology, 2003, 25(2): 263-269.

Citation:

Chen Yi, Jin Yaqiu. An improved method of the minimum entropy for refocusing the moving target image in the SAR observation[J]. Journal of Electronics & Information Technology, 2003, 25(2): 263-269.

Chen Yi, Jin Yaqiu. An improved method of the minimum entropy for refocusing the moving target image in the SAR observation[J]. Journal of Electronics & Information Technology, 2003, 25(2): 263-269.

Citation:

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An improved method of the minimum entropy for refocusing the moving target image in the SAR observation

Chen Yi,
Jin Yaqiu

Received Date: 2001-08-14
Rev Recd Date: 2002-03-08
Publish Date: 2003-02-19

Abstract

Abstract

Employing the synthetic technology with the Doppler shift, the high resolution image has been achieved by the observation of the space- or air-bome SAR (Syiitlietic. Aperture R.adar). However, unexpected Doppler shift caused by the high speed moving target can defocus the image. The Minimum Entropy Method (MEM) is an optimized method with no request of additional parameters. In this paper, an improved method of MEM is developed. The entropy, as a target function, is optimized for refocusing the image. This method is demonstrated fast and effective when it is applied to a simulated SAR image of a moving aircraft.

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References(1)

References

S.A. Hovanessian, Introduction to Synthetic Array and Imaging Radars, Mass., Artech House,1980, Chap.1. ［2］T. Itoh, H. Sueda, T. Wantanabe, Motion compensation for ISAR via centroid tracking, IEEE Trans. on Aerospace and Electronic Systems, 1996, AES-32(3), 1191-1197.[2]D.E. Wahl, P. H. Eichel, D. C. Ghiglia, C, V. Jakowatz Jr., Phase gradient auto-focusing-A robust tool for high resolution SAR phase correction, IEEE Trans. on Aerospace and Electronic Systems, 1994, AES-30(3), 827-835.[3]S. Werness, W. Carrara, L. Joyce, D. Franczak, Moving target imaging algorithm for SAR data,IEEE Trans. on Aerospace and Electronic Systems, 1990, AES-21(1), 57-67.[4]X. Li, G. S. Liu, J. L. Ni, Auto-focusing of ISAR images based on entropy minimization, IEEE Trans. on Aerospace and Electronic System, 1999, AES-35(4), 1240-1251.[5]D. Kasilingam, J. F. Wang, J. S. Lee, R. Jensen, Focusing of synthetic aperture radar images of moving targets using minimum entropy adaptive filters, IGARSS 2000, Hawaii, 74-76.[6]C. Oliver, S. Quegan, Understanding Synthetic Aperture Radar Images, Mass., Artech House,1998, Chap.1.

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