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IEEE Transactions on Antennas and Propagation
Volume 47 Number 5, May 1999

Diffuse Like and Cross-Polarized Fields Scattered from Irregular Layered Structures--Full-Wave Analysis

Page 941.

Abstract:

The full-wave solution for scattering from two-dimensional (2-D) irregular layered structures is expressed as a sum of radiation fields, the lateral waves, and the surface waves. Only the radiation far fields are considered in this work. The lateral waves and surface waves are ignored since excitations of plane waves are considered and the observation points are in the far fields. The scattering coefficients appearing in the full-wave generalized telegraphists' equations for irregular layered structures are proportional to the derivatives of the surface heights at each interface. Using a first-order iterative procedure to solve the generalized telegraphists' equations, the diffusely scattered fields from irregular layered structures are expressed as a sum of first-order fields scattered at each rough interface. In this paper, the like and cross-polarized diffuse scattered fields are derived for three medium irregular structures with 2-D rough interfaces. The thickness of the coating material or thin film between the two interfaces is arbitrary, however, in this work it is assumed to be constant. Thus, in this case, both interfaces are rough and there are five different scattering processes identified in the full-wave results. A physical interpretation is given to the five different scattering mechanisms that contribute to the diffusely scattered fields. This work can be used to provide realistic analytical models of propagation across irregular stratified media such as ice or snow covered terrain, remote sensing of coated rough surfaces, or the detection of buried objects in the presence of signal clutter from the rough interfaces.

References

1. E. Bahar, "Physical interpretation of the full wave solutions for electromagnetic fields scattered from irregular stratified media," Radio Sci., vol. 23, no. 5, pp. 749-759, Sept./Oct. 1988.
2. S. M. Haugland, "Scattering of electromagnetic waves from coated rough surfaces full wave approach," Ph.D. dissertation, Univ. Nebraska, Lincoln, NE, May 1991.
3. E. Bahar, S. M. Haugland, and A. H. Carrieri, "Full-wave solutions for Mueller matrix elements used to remotely sense irregular stratified structures," in Proc. Int. Geosci. Remote Sensing Symp. (IGARSS'91) Remote Sensing: Global Monitoring Earth Management, Espoo, Finland, 1991, vol. 1, pp. 1479-1482.
4. S. M. Haugland, E. Bahar, and A. H. Carrieri, "Identification of contaminant coatings over rough surfaces using polarized IR scattering," Appl. Opt., vol. 31, no. 19, pp. 3847-3852, July 1992.
5. E. Bahar and M. Fitzwater, "Full wave physical models of nonspecular scattering in irregular stratified media," IEEE Trans. Antennas Propagat., vol. 37, pp. 1609-1616, Dec. 1989.
6. R. D. Kubik, "Scattering and depolarization upon transmission and reflection from multilayered structures," Ph.D. dissertation, Univ. Nebraska, Lincoln, NE, 1993.
7. E. Bahar, "Full wave--Copolarized nonspecular transmission and reflection scattering matrix elements for rough surfaces," J. Optical Soc. Amer., vol. A5, pp. 1873-1882, Nov. 1988.
8. --, "Depolarization of electromagnetic waves excited by distributions of electric and magnetic sources in inhomogeneous multilayered structures of arbitrarily varying thickness--Generalized field transforms," J. Math. Phys., vol. 14, no. 11, pp. 1502-1509, Nov. 1973.
9. --, "Depolarization of electromagnetic wave propagation in inhomogeneous multilayered structures of arbitrary thickness--Full wave solutions," J. Math. Phys., vol. 14, no. 11, pp. 1510-1515, Nov. 1973.
10. --, "Electromagnetic wave propagation in inhomogeneous multilayered structures of arbitrary thickness--Generalized field transforms," J. Math. Phys., vol. 14, no. 8, pp. 1024-1029, Aug. 1973.
11. --, "Electromagnetic wave propagation in inhomogeneous multilayered structures of arbitrary thickness--Full wave solutions," J. Math. Phys., vol. 14, no. 8, pp. 1030-1036, Aug. 1973.
12. --, "Full-wave solutions for the depolarization of the scattered radiation fields by rough surfaces of arbitrary slope," IEEE Trans. Antennas Propagat., vol. AP-29, pp. 443-454, May 1981.