Volume Integral Nystrom Analysis Method of Electromagnetic Scattering in Inhomogeneous Media Targets

Abstract

The invention discloses a volume integral Nystrom analysis method of inhomogeneous medium target electromagnetic scattering. A high-order curved tetrahedron unit is taken as a partition unit for simulating the shape of an object; a Lagrange interpolation polynomial in each tetrahedron is taken as a current expansion equation; and a Gauss integral point is taken as a Lagrange interpolation point to guarantee that a volume current expression form has high-order precision. A high-order primary function still can be adopted for analysis by aiming at the inhomogeneous characteristics of the object. The high-order primary function is used to enable the method to consume lower computation memory and shorter computation time relative to a traditional method based on a SWG primary function.

Description

technical field [0001] The invention belongs to the rapid calculation technology of target electromagnetic scattering characteristics, in particular to a volume fraction Nystrom analysis method of non-uniform medium target electromagnetic scattering. Background technique [0002] The rapid calculation of electromagnetic scattering of three-dimensional dielectric bodies plays an important role in practical applications, such as electromagnetic modeling of organisms, biological imaging, and underground target detection. For the electromagnetic scattering of uniform or piecewise uniform dielectric body, the surface integral equation based on the equivalence principle can be used (P.Yla-Oijala and M.Taskinen.Well-conditionedmuller formulation for electromagnetic scattering by dielectric objects.IEEETrans.Antennas Propagat., 2005,53(10):3316-3323), the unknown current / magnetic current of this method is distributed on the interface of different media, which has the characteristics...

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Problems solved by technology

However, for the inherent inhomogeneity of inhomogeneous media, even if high-order basis functions can be used, the computational resource savings are limited

Because in the traditional definition of higher-order basis functions, the medium in each basis function is considered to be homogeneous, and the subdivision size cannot be increased due to the non-uniform characteristics of scatterers, which limits the performance of higher-order basis functions

Therefore, the efficiency of traditional high-order basis functions is limited when analyzing scatterers and non-uniform scatterers whose dielectric parameters satisfy arbitrary function distribution.

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