Abstract
For a 2-D problem and at microwave radar frequencies, in a previous paper, the field scattered by a highly conducting large rough sea surface in the presence of a duct having a linear-square refractive index profile has been computed. The forward–backward (FB) method has been applied to solve the linear system obtained by discretizing the boundary integral equation from the method of moments. To reduce again the complexity in order to solve huge problems, the subdomain decomposition iterative method is applied and combined with the FB spectral-acceleration for the calculation of the surface currents on each subsurface of the sea. The adaptive cross approximation algorithm is also applied to accelerate the coupling steps between the subsurfaces. Finally, this method is tested on the medium having a refractive index of parabolic profile, which is more realistic than a linear profile.
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