volume | PIER Journals

2005-04-18

Depolarized Upward and Downward Multiple Scattering from a Very Rough Surface

Chin-Yuan Hsieh,

Dr. Chin-Yuan Hsieh

E.C.E. Department

National Kaohsiung Marine University

Taiwan

Homepage

Adrian Fung

Professor Adrian Fung

Department of Electrical Engineering

University of Texas at Arlington

USA

Homepage

, Vol. 54, 199-220, 2005

doi:10.2528/PIER04100401

Abstract

From a very roughly random surface the backscattering enhancement is predicted due to the constructive interference of multiple surfaces scattering. For specialized surfaces involving roughness large compared with the incident wavelength, the backscattering enhancement takes place. The phenomenon of backscatter enhancement becomes evident for both larger normalized surface height and surface rms slope. In this paper we take further study to predict the backscattering enhancement mainly comes from upward multiple scattering. On the contrary the downward multiple scattering has no contributions to the scatter strength of backscattering enhancement. The model developed in this paper is based upon the integral equation method and able to predict this phenomenon of multiple scattering and backscattering enhancement. The depolarized multiple scattering makes much contribution along the plane of incidence from random rough surfaces, but depolarized single scattering makes little contributions. The total multiple scattering strength is the summation of upward and downward multiple scattering strength. In comparison of model prediction of total multiple scattering strength with measured data along the specular plane, excellent agreement is obtained.

Citation

Copy Export

Chin-Yuan Hsieh, and Adrian Fung, "Depolarized Upward and Downward Multiple Scattering from a Very Rough Surface," , Vol. 54, 199-220, 2005.
doi:10.2528/PIER04100401

References

1. Ailes-Sengers, L., A. Ishimaru, and Y. Kuga, "Analytical and experimental studies of electromagnetic waves scattered by two-dimensional, dielectric very rough surfaces," International Geoscience and Remote Sensing Symposium, Vol. 2, 1349-1351, 1995.

2. Johnson, J. T., R. T Shin, L. Tsang, C. H. Chan, A. Ishimaru, and Y. Koga, "Backscattering enhancement of electromagnetic waves from two-dimensional perfectly conducting random rough surfaces: A comparison of Monte Carlo simulations with experimental data," IEEE Transactions on Antennas and Propagations, Vol. 44, No. 5, 748-755, 1996.
doi:10.1109/8.496261

3. Kuga, Y. and H. Zhao, "Experimental studies on the phase distribution of two copolarized signals scattered from two-dimensional rough surfaces," IEEE Transactions on Geoscience and Remote Sensing, Vol. 34, No. 2, 601-603, 1996.
doi:10.1109/36.485136

4. Ocla, H. E. and M. Tateiba, "Backscattering enhancement in radar cross-section for concave-convex targets in random media," IEEE 2000 International Geoscience and Remote Sensing Symposium, Vol. 4, 1720-1722, 2000.

5. Hsieh, C.-Y., "Dependence of backscattering enhancement from randomly very rough surfaces," IEEE 1999 International Geoscience and Remote Sensing Symposium, Vol. 4, 2197-2199, 1999.

6. Hsieh, C.-Y. and A. K. Fung, "Application of an extended IEM to multiple surface scattering and backscatter enhancement," IEEE International Geoscience and Remote Sensing, Vol. 2, 702-704, 1997.

7. Poggio, A. J. and E. K. Miller, Integral Equation Solution of Three Dimensional Scattering Problems, Computer Techniques for Electromagnetics, 1973.

8. Smith, R. G., "Geometrical shadowing of randomly rough surfaces," IEEE Trans. Antenna Propagation, Vol. AP-15, 668-671, 1967.
doi:10.1109/TAP.1967.1138991