volume | PIER Journals

Abstract

While a radar target is illuminated under the condition of spherical wave, two-dimensional ISAR image can be obtained in near field, and the wavefront curvature must be compensated. A novel two-dimensional mathematical model is set up, and a 2D-ESPRIT super-resolution algorithm based on matrix pencil is applied to estimate the accurate locations of the scattering centers in near field. Numerical simulations are conducted in different distances as well as with different SNRs. It is proved that the method can revise the spherical wavefront curvature with a high accuracy. Finally, near field ISAR imaging experiments were done outdoor, and raw data were processed with this super-resolution method, which verify that 2D-ESPRIT algorithm based on matrix pencil can compensate the spherical wavefront curvature effectively in near field.

1. Mensa, D. L., High Resolution Radar Cross Section Imaging, 458-462, Artech House, London, Boston, 1991.

2. Li, H.-J. and F.-L. Lin, "Near FIeld imaging for conducting objects," IEEE Trans. Antennas Propag., Vol. 39, No. 5, 600-605, 1991.
doi:10.1109/8.81486 Google Scholar

3. LaHaie, I. J., E. I. L. Baron, and J. W. Burns, "Far FIeld radar cross-section (RCS) predictions from planar near FIeld measurements," IEEE AP-S Symp. Dig., 1542-1545, Chicago, 1992. Google Scholar

4. Broquetas, A., "Spherical wave near-field imaging and radar cross- section measurement," IEEE Trans. Antennas Propag., Vol. 46, No. 5, 730-735, 1998.
doi:10.1109/8.668918 Google Scholar

5. Yuen, N. and B. Friedlander, "Performance analysis of higher order ESPRIT for localization of near-FIeld sources," IEEE Trans. Signal Processing, Vol. 46, No. 3, 709-719, 1998.
doi:10.1109/78.661337 Google Scholar

6. Vaupel, T. and T. F. Eibert, "Comparison and application of near-field ISAR imaging techniques for far-field radar cross section determination," IEEE Trans. Antennas Propag., Vol. 54, No. 1, 144-151, 2006.
doi:10.1109/TAP.2005.861549 Google Scholar

7. Haardt, M., R. N. Challa, and S. Shamsunder, "Improved bearing and range estimation via high-order subspace based Unitary ESPRIT," Proc. 30th Asilomar Conference on Signals, Systems and Computers, Vol. 1, 380-384, 1996. Google Scholar

8. Van der Veen, A. J., P. B. Ober, and E. F. Deprettere, "Azimuth and elevation computation in high resolution DOA estimation," IEEE Trans. Signal Processing, Vol. 40, No. 7, 1828-1832, 1992.
doi:10.1109/78.143456 Google Scholar

9. Van der Veen, A. J. and E. F. Deprettere, "Parallel VLSI matrix pencil algorithm for high resolution direction fingding," IEEE Trans. Signal Processing, Vol. 39, No. 2, 383-394, 1991.
doi:10.1109/78.80822 Google Scholar

10. Li, H.-J., N. H. Farhat, et al. "Image understanding and interpretation in microwave diversity imaging," IEEE Trans. Antennas Propag., Vol. 37, No. 8, 1048-1057, 1989.
doi:10.1109/8.34143 Google Scholar

11. Peixoto, G. G., M. A. Alves, I. M. Martin, M. C. de Rezende, and A. Medium, "A medium open range radar cross section facility in Brazil," PIERS Online, Vol. 5, No. 4, 381-384, 2009.
doi:10.2529/PIERS090220150508 Google Scholar

12. Martin, I. M., M. A. Alves, G. G. Peixoto, and M. C. Rezende, "Radar cross section measurements and simulations of a model airplane in the X-band," PIERS Online, Vol. 5, No. 4, 377-380, 2009.
doi:10.2529/PIERS090220150258 Google Scholar

Dr. Weidong Hu

Dr. Rong Liu

Dr. Chao Wu

Dr. Chengyun Shi