Abstract
A GO (geometrical optics) model for scattering by irregular terrain is described. GO is limited to propagation paths that do not graze the terrain surface since diffraction or surface waves are neglected: however, it represents a relatively simple approach and can be applied to three-dimensional terrain models. The GO model was tested for scattering from a two-dimensional Gaussian ridge to compare with results published by L.A. Berry (1967), who solved a Volterra integral equation for the field over the surface and then integrated to get the field above the ridge. >
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