Hybrid analysis method of electromagnetic scattering from targets with medium in cavity

Abstract

The invention discloses an electromagnetic scattering hybrid analysis method for a medium-containing target in a cavity. The steps are as follows: fill the cavity part of the cavity-containing target with solid metal, establish a discrete model of the filled target, and construct a matrix equation; recursively solve the node electric field values ​​​​on each section in turn; calculate the electric field of the last section Values ​​are corrected to obtain the electric field value at the discrete node, and the electric field value is corrected for the phase; the cavity part of the target is solved by the volume integral equation alone, and the sub-scattering obtained by discretizing the metal surface and the dielectric body in the cavity The volume is grouped, and the induced current on the metal surface in the cavity and the polarization current in the medium are solved by using the fast multi-level sub-method; The electric field value is converted to solve the radar cross-sectional area. The invention combines the volume integral equation with the gridless parabola equation, avoiding the defect that the parabola cannot calculate cavity scattering.

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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