PROJECT TITLE :
Guest Editorial for Special Section on ISB/TBC 2014
The first-order perturbative solution of scattering from layered rough surfaces is investigated numerically and analytically. The analytical answer is obtained using a little perturbation approach based mostly on the extended boundary conditions (EBCs). Recently, the first-order scattering solution of a two-rough-surface structure with inhomogeneous dielectric profiles was derived using an EBC-based small perturbation method. During this paper, using those solutions and utilizing the Bragg scattering nature of the primary-order perturbative solutions, the matter of scattering from a multi-rough-surface structure is solved straightforwardly. The derived 1st-order components of the scattering matrix are simplified and rewritten explicitly in terms of the generalized reflection and transmission coefficients. Thanks to the simple form of the final solutions, they're simply interpreted in terms of simple scattering mechanisms. Then, the solutions are numerically evaluated for three-layer rough surfaces with totally different subsurface parameters. It's observed that the distinction normalized radar cross sections follow definite straightforward patterns because the subsurface characteristics are modified. Finally, these variation patterns, that might be of interest in inverse scattering issues, are analytically explained using the derived theoretical solutions. Indeed, the solutions are expressed in forms in which the terms responsible for the observed patterns are explicitly distinguished.
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