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Finite element boundary integral method for rapidly analyzing electromagnetic scattering properties of non-uniform targets

A target electromagnetic scattering and boundary integration technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as limiting solution efficiency, large unknowns in boundary surfaces, etc., reducing algorithm complexity and easy program implementation. , the effect of reducing far-field memory requirements

Active Publication Date: 2017-01-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, for the problem of electrically large non-uniform targets, dense meshing is required to ensure calculation accuracy, which will lead to large unknowns on the boundary surface, which will greatly limit the solution efficiency

Method used

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  • Finite element boundary integral method for rapidly analyzing electromagnetic scattering properties of non-uniform targets
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  • Finite element boundary integral method for rapidly analyzing electromagnetic scattering properties of non-uniform targets

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Embodiment

[0057] In this embodiment, a typical simulation of electromagnetic scattering is carried out. The simulation is implemented on a server with a main frequency of 2.0GHz and a memory of 512GB. The pointed arch model with dimensions of 3.49m, 0.698m, and 0.698m in x, y, and z directions is E.g figure 2 As shown, the surface has a coating with a thickness of 0.03m and a relative permittivity of (4.0, 0.5). The model was subdivided with a subdivision size of 0.03λ, and 41570 tetrahedrons and 13138 triangular elements were obtained. A three-layer structure is obtained by using 0.2λ wavelength grouping in the thinnest layer. The frequency of the incident wave is 300MHz, the direction of the incident wave is θ=0°, The viewing angle is The method of the invention and the traditional finite element boundary integral method are respectively used to analyze the electromagnetic scattering of the target. image 3 The RCS curves simulated for the two electromagnetic scattering character...

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Abstract

The invention discloses a finite element boundary integral method for rapidly analyzing electromagnetic scattering properties of non-uniform targets. According to the method, a multilayer complex point source rapid method and the finite element boundary integral method are combined to analyze the electromagnetic scattering properties of non-uniform targets. According to the method, an octree grouping technology is adopted to group analyzed problems, and the action, on a far field, of primary functions in the groups is equivalent to the action, on the far field, of complex point sources, the quantity of which in the aspect of equivalent surfaces in the groups is much less than the quantity of the primary functions in the groups by utilizing an equivalence principle. According to the method disclosed by the invention, the calculation time and memory requirements can be effectively saved in the analysis of the electromagnetic scattering properties of non-uniform targets for calculation of fine-grid subdivision.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to a fast simulation method of electromagnetic scattering characteristics combined with a multilayer multi-point source fast method and a finite element boundary integral method. Background technique [0002] The analysis of electromagnetic scattering characteristics of inhomogeneous targets has always been a hot research field. Many algorithms can analyze such problems. For the differential classification method, the finite element method (FEM) and the finite difference time domain method (FDTD) can be used to analyze the non-uniform target. However, for the differential classification algorithm, in order to obtain a unique solution, it is necessary to use Absorbing Boundary Conditions (ABC) or Perfectly Matched Layers (PML) for boundary truncation, which will increase the calculation scale. For the integral class...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 樊振宏胡帅帅陈如山丁大志王珂琛
Owner NANJING UNIV OF SCI & TECH
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