Abstract
We implement the second-order nonlocal small-slope approximation (NLSSA) to compute bistatic scattering from deterministic two-dimensional rough surfaces. Due to a fewer number of function evaluations in the NLSSA kernel versus the (local) second-order SSA kernel and NLSSA scattering amplitude characteristics that enable integral evaluations by fast Fourier transforms, the computational cost of NLSSA can be slightly reduced versus that of second-order SSA. For the rough surfaces and parameter space considered here, the results do not show significant differences among the techniques.
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