An exact evaluation of Kirchhoff approximation for backscattering from a one-dimensional rough surface

摘要

The backscattered total intensity is evaluated without using any further approximation and the results are compared with those of the zeroth-order and the first-order approximated physical optics (PO) models. In other words, the exactly evaluated Kirchhoff approximation (KA) solution has been used to examine the effects of the slope terms and the edge term. Since the evaluation of backscattering from a two-dimensional rough surface requires a very long computing time, only one-dimensional rough dielectric and conducting surface is considered. The exactly evaluated KA solution is verified with a moment method (MM) solution for a rough surface.