A modified perturbation method of electromagnetic scattering from a rough surface is presented, in which theeffect of the curvature of the surface is taken into account based on the conventional small perturbation method.The problem of scattering error by the conventional small perturbation method at grazing angle is solved. Compared with a set of measured data, the numerical results of the backscattering radar cross section show that thismodified perturbation method is walidity for small, moderate and grazing angle incidence.
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