NUMERICAL AND EXPERIMENTAL VALIDATIONS OF IEM FOR BISTATIC SCATTERING FROM NATURAL AND MANMADE ROUGH SURFACES

Abstract

The Integral Equation Method (IEM) is applied for about ten years to model the surface scattering phenomenon. Recently, Fung published in [1] an extra improved version of the IEM model. In this paper, numerical and experimental validations of the model are investigated. In backscattering, as in bistatic scattering, number of numerical validations are made on a wide frequency band, by comparing IEM predictions with a reference method results (Method of Moments). IEM results are also compared with those of some asymptotic models such as Small Perturbation Method (SPM) and Kirchhoff Model (KM) in the frequency domains where these latter are applicable. The improved model validation is achieved by presenting confrontations of the simulation results with experimental data, some of them have been collected in appropriate papers, and the others come from experiments we conducted at the ElectroMagnetism and Radar Department (DEMR) of the Office National d’Etudes et de Recherches Aerospatiales (ONERA)-Toulouse (France). † Also with ONERA-DEMR, 2 Avenue Edouard Belin, 31055 Toulouse Cedex 4, France 204 Koudogbo, Combes, and Mametsa