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A Comparison Study of the Surface Scattering



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A Comparison Study of the Surface Scattering Models and Numerical Model H T Ewe1 Joel T Johnson2 and K S Chen3 1 Faculty of Engineering Multimedia University Cyberjaya 63100 Selangor MALAYSIA Email htewe mmu edu my 2 Department of Electrical Engineering and Electro Science Laboratory The Ohio State University Columbus OH 43210 USA 3 Center for Space and Remote Sensing Research and Institute of Space Science National Central University Chung Li Taiwan 32054 Abstract This paper describes a comparison study of surface scattering models and a numerical model for dielectric surfaces Two surface scattering models namely the Integral Equation Model IEM and the Small Slope Approximation SSA model are used to calculate the backscattering coefficients of rough surfaces and the results are compared with numerical simulations based on the Moment Method MoM Analysis of the results obtained is also presented II CONFIGURATION Fig 1 shows the configuration of the study where r is the complex dielectric constant of the surface and i is the incident angle A 2 D 3 D scattering problem isotropic Gaussian correlated surface with surface rms height and surface correlation length l is considered I INTRODUCTION In the study of the interaction of microwaves with media bounded by rough interfaces a practical and realistic surface scattering model is required to understand the surface scattering mechanism and predict the scattering returns for a variety of surface profiles The usability and correctness of the model are essential in microwave remote sensing and a good understanding of the validity and limitation of the models will be necessary for modeling active and passive microwave scattering mechanisms for earth terrain and also inversion models Surface scattering models based on both the small perturbation method SPM and the Kirchhoff model had been widely used in the past in the theoretical modeling of microwave remote sensing 1 Recent models such as the Integral Equation Model IEM 2 and



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