A Numerical Study of Low Grazing Angle Backscattering from Random Rough Surfaces

不規則 粗面에서 저입사각 후방산란에 관한 수치해석

  • Kwang-Yeol Yoon (Department of Electronic Engineering, Keimyung University)
  • Published : 2002.07.01

Abstract

We have numerically analyzed the electromagnetic wave scattering from randomly rough dielectric surfaces by using the finite volume time domain (FVTD) method. We have then shown that the present method yields a reasonable solution even at low-grazing angle (LGA). It should be noted that the number of sampling points per wavelength should be increased when more accurate numerical results are required, which fact makes the computer simulation impossible at LGA for a stable result. However, when the extrapolation is used for calculating the scattered field, an accurate result can be estimated. If we want to obtain the ratio of backscattering between the horizontal and vertical polarization, we do not need the large number of sampling points. The results are compared with the experimental data.

Keywords

FVTD Method;Low Crazing Angle;Backscattering Coefficient;Polarization Ratio

References

  1. Wave Scattering from Rough Surfaces (Springer series on Wave Phenomena)(2nd edition) Alexander G. Voronovich
  2. IGARSS'98 v.Ⅳ no.DDⅡ FVTD analysis of electromagnetic wave scattering by rough surface K. Uchida;K. Y. Yoon;Y. Kuga;A. Ishimaru
  3. J. Geophysical Res. v.100 no.C2 X band microwave backscattering form ocean waves P. H. Y. Lee;J. D. Bater;K. L. Beach;C. L. Hindman;B. M. Lake;H. Rungaldier;J. C. Shelton;A. B. Williams;R. Yee;H. C. Yuen https://doi.org/10.1029/94JC02741
  4. J. Acoust. Soc. Am. v.83 no.1 The validity of the Kirchhoff approximation for rough surface scattering using a Gaussian roughness spectrum E. I. Thoros https://doi.org/10.1121/1.396188
  5. IEEE Trans. Antennas Propagat. v.43 no.11 A Monte-Carlo FDTD technique for rough surface scattering F. D. Hastings;J. B. Schneider;S. L. Broschat
  6. IEEE Trans. Antennas Propagat. v.46 no.1 Monte Carlo simulations of large-scale one-dimensional random-rough surface scattering at near-grazing incidence: penetrable case C. H. Chan;L. Tsang;Q. Li https://doi.org/10.1109/8.655461
  7. IEEE Trans. on MTT v.46 no.12 FDTD Improvement by Dielectric Subgrid Resolution G. Marrocco;M. Sabbadini;F. Bardati https://doi.org/10.1109/22.739302
  8. Commun. Pure Appl. Math. v.4 Reflection of electromagnetic wave from slightly rough surfaces S. O. Rice https://doi.org/10.1002/cpa.3160040206
  9. IEICE Trans. Electron. v.E83-C FVTD Simulation for Random Rough Dielectric Surface Scattering at Low Grazing Angle K. Y. Yoon;M. Tateiba;K. Uchida
  10. Wave Propagation and Scattering in Random Media A. Ishimaru
  11. J. Comp. Phys. v.114 no.2 A perfectly matched layer for the absorption of electromagnetic waves J. P. Berenger https://doi.org/10.1006/jcph.1994.1159
  12. IEEE Trans. Antennas Propagat. v.AP-20 Comments on The relationship between the Kirchoff approach and small perturbation analysis in rough surface scattering theory G. R. Valenzulea;J. W. Wright;J. C. Leader
  13. Res. Bull. Fukuoka Inst. Tech. v.29 no.1 FVTD algorithm and its application procedure K. Uchida;T. Matunaga;T. Noda;K. K. Han
  14. Electromagnetic Wave Propagation, Radiation, and Scattering A. Ishimaru
  15. IEEE Trans. Antennas Propagat. v.46 no.1 On the discretization of integral equation describing scattering by rough conducting surface J. V. Toporkov;R. T. Marchand;G. S. Brown https://doi.org/10.1109/8.655462