Mixed analysis method for electromagnetic scattering of cavity containing medium target

Abstract

The invention discloses a mixed analysis method for electromagnetic scattering of a cavity containing a medium target. The method comprises the following steps that a cavity body part containing the cavity target is filled to be solid metal, a target discrete model after filling is conducted is established, and a matrix equation is constructed; recursive solving is conducted on node electric field values on tangent planes in sequence; correction is conducted on the electric field values on the last tangent plane, electric field values near discrete nodes are obtained, and phase correction is conducted on the electric field values; solving is conducted on the cavity body part in the target independently by using a body area integral equation, metal surfaces and dielectric bodies in the cavity body are dispersed to obtain sub scatterer grouping, induced currents on the metal surface and polarization currents in inner bodies of the medium are solved by using a fast multilevel method, the electric field values of the discrete points needed by a parabolic equation on an opening surface of the cavity body are solved, and switch solving of a radar discrete section area is conducted on near-field electric field values. The body area integral equation is combined with a meshless parabolic equation, and the defect that cavity body scattering cannot be calculated by the parabolic equation is avoided.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to a hybrid analysis method for electromagnetic scattering of a target containing a medium in a cavity. Background technique [0002] In the past ten years, the analysis of electromagnetic scattering characteristics of electrically large and complex cavities has aroused extensive research interest. The parabolic equation method has great advantages in dealing with electrically large and complex metal targets. The parabolic equation method was mainly used to deal with the more complex propagation problems of sound waves and optical problems in the early stage. This method was first proposed by Lenontovich in 1946. Subsequently, Malyuzhiners combined the PE method with the geometric optics method, and proposed a theory about obstacle diffraction; Hardin proposed a split-step Fourier method to solve the problem of und...

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Problems solved by technology

[0003] However, the parabolic equation has its own defects. This method has a large calculation error when calculating the scattering of electrically small-sized targets, and it is not suitable for calculating the scattering of cavities or concave surfaces, mainly because the scattering field on the surface of these targets is in the There is a big change in the direction of propagation

The volume integral equation based on the method of moments is an integral numerical simulation method. It is an exact solution to the wave equation and can accurately analyze the electromagnetic scattering of the cavity. However, it consumes a lot of memory when calculating the electromagnetic scattering of the electrically large medium target.

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