volume | PIER Journals

Abstract

This paper presents an investigation for the electromagnetic scattering characteristic of the 2-D infinitely long target located above two-layered 1-D rough surfaces. A finite-difference time-domain (FDTD) approach is used in this study, and the uniaxial perfectly matched layer (UPML) medium is adopted for truncation of FDTD lattices, in which the finite-difference equations can be used for the total computation domain by properly choosing the uniaxial parameters. The upper and lower interfaces are characterized with Gaussian statistics for the height and the autocorrelation function. For the composite scattering of infinitely long cylinder and underlying single-layered rough surfaces as an example, the angular distribution of scattering coefficient with different incident angles is calculated and it shows good agreement with the numerical result by the conventional method of moments. And the influence of some parameters related to the twolayered rough surfaces and target on composite scattering coefficient is investigated and discussed in detail.

1. Johnson, J. T., "A study of the four-path model for scattering from a target above a half space," Microw. Opt. Techn. Lett., Vol. 30, No. 2, 130-134, 2001.
doi:10.1002/mop.1242

2. Kizilay, A. and S. Makal, "A neural network solution for identification and classification of cylindrical targets above perfectly conducting flat surfaces," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 14, 2147-2156, 2007.
doi:10.1163/156939307783152759

3. Li, X. F., Y. J. Xie, and R. Yang, "High-frequency method analysis on scattering from homogenous dielectric objects with electrically large size in half space," Progress In Electromagnetics Research B, Vol. 1, 177-188, 2008.
doi:10.2528/PIERB07103001

4. Chen, X. J. and X. W. Shi, "Backscattering of electrically large perfect conducting targets modeled by NURBS surfaces in half-space," Progress In Electromagnetics Research, Vol. 77, 215-224, 2007.
doi:10.2528/PIER07081602

5. Zhang, Y., Y. E. Yang, H. Braunisch, and J. A. Kong, "Electromagnetic wave interaction of conducting object with rough surface by hybrid SPM/MOM technique," Progress In Electromagnetics Research, Vol. 22, 315-335, 1999.
doi:10.2528/PIER98112506

6. Wang, X., C. F.Wang, Y. B. Gan, and L. W. Li, "Electromagnetic scattering from a circular target above or below rough surface," Progress In Electromagnetics Research, Vol. 40, 207-227, 2003.
doi:10.2528/PIER02111901

7. Rodriguez, P. M., L. Landesa, J. L. Rodriguez, F. Obelleiro, and R. J. Burkholder, "The generalized forward-backward method for analyzing the scattering from targets on ocean-like rough surfaces," IEEE Trans. Antennas Propag., Vol. 57, No. 6, 961-963, 1999.
doi:10.1109/8.777118

8. Xu, L., Y. C. Guo, and X. W. Shi, "Dielectric half space model for the analysis of scattering from objects on ocean surface," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 15, 2287-2296, 2007.
doi:10.1163/156939307783134272

9. Guo, L. X. and C. Y. Kim, "Light scattering models for a spherical particle above a slightly dielectric rough surface," Microw. Opt. Techn. Lett., Vol. 33, No. 2, 142-146, 2002.
doi:10.1002/mop.10259

10. Li, J., L. X. Guo, and H. Zeng, "FDTD investigation on the electromagnetic scattering from a target above a randomly rough a sea surface," Waves in Random and Complex Media, Vol. 18, No. 4, 641-650, 2008.
doi:10.1080/17455030802302134

11. Zhang, Y. and E. Bahar, "Mueller matrix elements that characterize scattering from coated random rough surfaces," IEEE Trans. Antennas Propag., Vol. 57, No. 5, 949-955, 1999.
doi:10.1109/8.774161

12. Fuks, I. M. and A. G. Voronovoch, "Wave diffraction by rough surfaces in an arbitrary plane layered medium," Waves in Random Media, Vol. 10, No. 2, 253-272, 2000.
doi:10.1088/0959-7174/10/2/304

13. Shenawee, M. E., "Polarimetric scattering from two-layered two-dimensional random rough surfaces with and without buried objects," IEEE Trans. Geosci. Remote Sensing, Vol. 52, No. 1, 67-76, 2005.

14. Hu, B. and W. C. Chew, "Fast inhomogeneous plane wave algorithm for scattering from objects above the multilayered medium," IEEE Trans. Geosci. Remote Sensing, Vol. 39, No. 5, 1028-1038, 2001.
doi:10.1109/36.921421

15. Kuga, Y. and P. Phu, "Experimental studies of millimeter wave scattering in discrete random media and from rough surfaces," Progress In Electromagnetics Research, Vol. 14, 37-88, 1996.

16. Gedney, S. D., "An anisotropic perfectly matched layer-absorbing medium for the truncation of FDTD lattices," IEEE Trans. Antennas Propag., Vol. 44, No. 12, 1630-1639, 1996.
doi:10.1109/8.546249

17. Gedney, S. D., "An anisotropic PML absorbing media for the FDTD simulation for fields in lossy and dispersive media," Electromagnetics, Vol. 16, No. 4, 425-449, 1996.
doi:10.1080/02726349608908487

18. Juntunen, J. S. and T. D. Tsiboukis, "Reduction of numerical dispersion in FDTD method through artificial anisotropy," IEEE Trans. on Microwave Theory Tech., Vol. 58, No. 5, 582-588, 2000.
doi:10.1109/22.842030

19. Taflove, A. and S. C. Hagness, Computational Electrodynamics: The Finite-difference Time-domain Method, Artech House, Boston, 1995.

20. Fung, A. K., M. R. Shah, and S. Tjuatja, "Numerical simulation of scattering from three-dimensional randomly rough surfaces," IEEE Trans. Geosci. Remote Sensing, Vol. 32, No. 5, 986-995, 1995.
doi:10.1109/36.312887

21. Ruck, G., D. E. Barrick, W. D. Stuart, and C. K. Krichbaum, Radar Cross Section Handbook, Vol. 1, Plenum Press, New York, 1970.

22. Tsang, L., J. A. Kong, and K. H. Ding, Scattering of Electromagnetic Waves, Vol. 2, John Wiley & Sons, Inc., USA, 2001.

Dr. Juan Li

Professor Li-Xin Guo

Dr. Hao Zeng