Some computational results for rough-surface scattering

John A. DeSanto; Richard J. Wombell

doi:10.1117/12.49627

11 November 1991 Some computational results for rough-surface scattering

John A. DeSanto, Richard J. Wombell

Proceedings Volume 1558, Wave Propagation and Scattering in Varied Media II; (1991) https://doi.org/10.1117/12.49627
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

We present computational results for scattering from rough surfaces. All the results are for the Dirichlet boundary value problem and one-dimensional surfaces s(x). Electromagnetically this corresponds to TE-polarization. The first set of results describes the reconstruction of rough- surface profiles from scattered field data. Two methods are presented. Both use the spectral- coordinate approach. The first is based on perturbation theory and is valid when kcos((theta) s)s(x)<<1, where k is wavenumber and (theta) s the scattering angle. Shallow profiles are reconstructed well. The second is based on the Kirchhoff approximation for the normal derivative of the total field on the surface. Using a combination of incident and scattered angles we develop a Fourier transform relation between the scattered data and the surface profile. The result is also good only for shallow surfaces. Both results are FFT-based. The second set of results is based on ensemble average results for homogeneous Gaussian distributed random surfaces. We illustrate two conclusions. They are (1) the coherent specular intensity is predominantly single scattering even when multiple scattering occurs, and (2) beyond a certain roughness the predominant field in the specular direction is incoherent rather than coherent.

Citation Download Citation

John A. DeSanto and Richard J. Wombell "Some computational results for rough-surface scattering", Proc. SPIE 1558, Wave Propagation and Scattering in Varied Media II, (11 November 1991); https://doi.org/10.1117/12.49627

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