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Electromagnetic scattering no-grid simulation method for appearance-complicated metal target

A metal target, electromagnetic scattering technology, applied in electrical digital data processing, instrumentation, calculation, etc., can solve problems such as difficulty in obtaining grid information, difficulty, and inability to generate grids, achieving a flexible and simple implementation process and a wide range of applications Effect

Active Publication Date: 2013-08-14
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] Although this traditional method has been widely used in the academic field, it is not suitable for dealing with metal objects with complex shape structures in actual engineering
Because it is often very difficult to generate a high-quality mesh for a metal target with a complex shape, especially when the metal target undergoes severe deformation, it is difficult to obtain mesh information that meets the requirements, and the traditional mesh Lattice patches must also appear in pairs, so when three surfaces are collinear in a metal target with a complex shape, the required grid generation cannot be performed, and the electromagnetic scattering simulation analysis of the metal target cannot be performed.

Method used

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  • Electromagnetic scattering no-grid simulation method for appearance-complicated metal target
  • Electromagnetic scattering no-grid simulation method for appearance-complicated metal target
  • Electromagnetic scattering no-grid simulation method for appearance-complicated metal target

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Embodiment 1

[0100] In order to verify the correctness and effectiveness of the method in this paper, a typical simulation of electromagnetic scattering with a metal target is carried out. The simulation is realized on a personal computer with a main frequency of 2.83GHz and a memory of 3.5GB. Taking a metal ball with a diameter of 2m as an example, the incident wave frequency is 300MHz, such as Figure 9 As shown, the direction of incident wave θ=0°, In order to verify the correctness of the method of the present invention, the Mie series simulation results of the analytical method are used as a reference. Figure 10 The RCS curves simulated for two kinds of electromagnetic scattering characteristics. From the curves in the figure, it can be seen that the method in this paper is effective at all viewing angles regardless of whether the incident wave is illuminated by the horizontal polarization or the vertical polarization of the incident wave. Both are consistent with the numerical res...

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Abstract

The invention discloses an electromagnetic scattering no-grid simulation method for an appearance-complicated metal target, which comprises the following steps that local integral domains of nodes are established: the local integral domain at the periphery of each node is constructed by a region growing algorithm according to distribution information of the discrete nodes on the surface of the appearance-complicated metal target; an electric field integral equation of the metal target is established; surface current at the discrete nodes is decomposed; surface current in the center of each integral domain is constructed; the electric field integral equation is tested by point matching; an impedance matrix equation is obtained and solved; a current coefficient is obtained; and a radar cross section is determined according to the current coefficient. The method is independent of modeling grid subdivision on the surface of the target; quick electromagnetic scattering simulation can be conducted on the target only after the distribution information of the discrete nodes on the surface of the target is known in advance; an implementation process of the method is flexible and free; and the method has a very high practical engineering application value.

Description

a technical field [0001] The invention belongs to the technical field of simulation of electromagnetic scattering characteristics, in particular to a gridless simulation method for electromagnetic scattering of metal objects with complex shapes. Two background technology [0002] With the development of the military field, more and more metal targets with complex shapes urgently need fast electromagnetic scattering simulation. When the traditional method analyzes the electromagnetic scattering problem of the metal target, it is necessary to use commercial software to carry out structured grid modeling on the metal target in advance to obtain the grid division information of the metal target surface. [0003] Although this traditional method has been widely used in the academic field, it is not suitable for dealing with metal objects with complex shape structures in actual engineering. Because it is often very difficult to generate a high-quality mesh for a metal target with...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 陈如山丁大志樊振宏陈睿程光尚
Owner NANJING UNIV OF SCI & TECH
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