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Time domain analysis method for electromagnetic properties of non-uniform rotational symmetric body

A technology of rotational symmetry and time-domain analysis, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as uneven rotational symmetry, many unknowns, and inability to make full use of rotational symmetry analysis. Achieve the effect of reducing unknown quantities and saving computing resources

Active Publication Date: 2017-05-10
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, in the current research, the time-domain integration method based on the order stepping (MOD) is not combined with the volume integral equation, so the rotational symmetry cannot be fully utilized to analyze the inhomogeneous rotationally symmetric body, and there are many unknowns and a large demand for computing resources. The problem

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  • Time domain analysis method for electromagnetic properties of non-uniform rotational symmetric body
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  • Time domain analysis method for electromagnetic properties of non-uniform rotational symmetric body

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Embodiment

[0062] In this embodiment, a typical simulation of electromagnetic scattering is carried out. The simulation is realized on a personal computer with a main frequency of 2.5GHz and a memory of 4GB. The radius of the metal cylinder is 0.1 meters, the height is 0.3 meters, and the radius of the first layer of dielectric cylinder is 0.1-0.3 meters. The height is 0.3 meters, the relative permittivity is 2, the radius of the second dielectric cylinder is 0.3-0.4 meters, the height is 0.3 meters, and the relative permittivity is 4. Using modulated Gaussian plane wave excitation, the incident angle is θ i =0deg, center frequency f 0 =150MHz, frequency bandwidth f bw =300MHz, the delay time is 3.5lm (light meters, representing the time required for electromagnetic waves to propagate one meter in free space), scale factor s=5.0c, and the order N=65 of the Laguerre polynomial, since the incident wave along the axis For incidence, only the equation for mode 1 needs to be solved. In o...

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Abstract

The invention discloses a time domain analysis method for electromagnetic properties of a non-uniform rotational symmetric body. The method comprises the steps that in a space domain, triangular patch discretization is adopted for an axial section of a target on a dielectric part, rectangular patch discretization is adopted on the part adjoining a rotation axis, and a one-dimensional scalar triangular basis function is adopted on a metal part to perform line segmentation on a generatrix of the target, and a Laguerre polynomial is adopted as a time basis function of a whole time domain to perform discretization; a body surface integral equation of the non-uniform rotational symmetric body is established according to boundary conditions, a source expanded in a Fourier mode after being subjected to space and time discretization is plugged into the body surface integral equation, and a Galerkin test is adopted to obtain a matrix equation under all modes and all orders finally; the matrix equation is solved to obtain dielectric body current coefficients and metal surface current coefficients under different modes and different orders; at last, the bistatic radar scattering sectional area of a target scatterer under a broadband is determined. Through the method, computing resources can be saved, and computing efficiency can be improved, and the method has quite high practical engineering application value.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to a time-domain analysis method for the electromagnetic characteristics of a non-uniform rotationally symmetrical body. Background technique [0002] A rotationally symmetric scatterer is a scatterer that can be obtained by rotating a generatrix or an axial section around a fixed axis. As an important class of radar targets, such as missile body and radome, people have done quite a lot of research on their electromagnetic scattering characteristics. A variety of numerical methods have been used to analyze such a special structure, among which the analysis and study of electromagnetic scattering of various rotating bodies by the method of rotationally symmetric moments has always been an important topic in the research of electromagnetic scattering. Since the method of moments was proposed to analyze the electromagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/11G06F17/14
CPCG06F17/11G06F17/14G06F30/367
Inventor 陈如山李骏丁大志樊振宏谷继红
Owner NANJING UNIV OF SCI & TECH
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