Determination of Surface Parameters when Modeling Backscattering of Radio Waves

摘要

The article is devoted to modeling the backscattering of the electromagnetic field as applied to the millimeter and centimeter ranges of radio wavelengths. The relevance of such studies is determined by the need to obtain the characteristics of the scattering of electromagnetic waves by various objects at the modeling stage. The aim of the work is to determine the acceptable values of surface discretization in the implementation of known and promising methods for calculating the scattered field.To achieve this goal, methods of mathematical and statistical modeling were used. The simulation results were compared with theoretical studies.The results of numerical simulation of electromagnetic field scattering using the Fresnel-Kirchhoff diffraction formula and a method based on representing the surface in the form of elementary flat areas are considered. Comparison of model and theoretical data on the effective scattering surface for the simplest objects (ball and plane) made it possible to determine the allowable value of the discretization of surfaces during backscattering of electromagnetic fields on them. It is shown that the determination of the field strength by the Fresnel-Kirchhoff method allows one to obtain an effective scattering surface with values that most closely coincide with theoretical data.It is shown that the Fresnel-Kirchhoff method most accurately describes the basic properties of a scattered field. When applying the modeling method, when the surface is represented as a set of flat elements with scattering patterns characteristic of them, it is necessary to normalize the results taking into account theoretical and experimental data.