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Method for analyzing a non-uniformly divided target electromagnetic scattering characteristic

A technology of target electromagnetic scattering and analysis method, applied in the field of numerical calculation of target electromagnetic scattering characteristics, can solve the problems of low frequency numerical instability, slow convergence speed, low calculation accuracy, etc., achieve high flexibility and effectiveness, save time and memory Effect

Inactive Publication Date: 2018-05-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The resulting challenges are: On the one hand, for traditional numerical methods such as multi-layer fast multipole methods, low-frequency numerical instability, slow convergence speed, low calculation accuracy, and high computational resource consumption are difficult
For the existing typical low-rank compression method, it overcomes the disadvantage of low-frequency numerical instability, but the computational complexity is high; on the other hand, using the traditional octree uniform grouping method will increase the near-field Computing resource consumption
Therefore, the existing electromagnetic analysis methods are difficult to meet the engineering requirements of the simulation of the target electromagnetic characteristics of non-uniform subdivision

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  • Method for analyzing a non-uniformly divided target electromagnetic scattering characteristic
  • Method for analyzing a non-uniformly divided target electromagnetic scattering characteristic
  • Method for analyzing a non-uniformly divided target electromagnetic scattering characteristic

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Embodiment 1

[0062] In order to verify the correctness and effectiveness of the method in this paper, a numerical example is given below to verify the validity of the theory and program. The program was compiled in Fortran language and executed on a Sugon high-performance computer with Windows 7 64-bit system, 2TB memory, 2.30GHz main frequency and 92-core CPU. The CPU model is Intel(R) Xeon E7-8850.

[0063] Such as image 3 The monopole antenna array shown, where (a) is the overall schematic diagram of the target, and (b) is the detailed schematic diagram, it can be seen that the subdivision grid is uneven; the diameter of the bottom cylinder is 1m, the height is 0.05m, and the top is three radii A cylindrical antenna with a height of 0.015m and a height of 0.7m. The incident wave frequency was 300MHz, the base was gridded according to 0.05λ, the grids of the three cylinder sizes varied from 0.01λ to 0.0025λ, and the unknowns changed from 51852 to 334413. As shown in Table 1:

[0064]...

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Abstract

The invention discloses a method for analyzing a non-uniformly divided target electromagnetic scattering characteristic. The method includes the following steps of establishing an electromagnetic scattering integral equation based on an electric field boundary condition of an ideal conductor; establishing adaptive octree grouping to index a near field and a far field of each group; placing an equivalent source on each group, and converting action matrixes of two far field groups into equivalent source action of the two far field groups; filling the electric field integral equation with near field matrixes, generating a compression matrix corresponding to the far field groups of each group and storing; solving for a matrix equation to obtain a current coefficient, and calculating electromagnetic scattering parameters based on the current coefficient. The method saves computing time and memory, and has higher flexibility and effectiveness.

Description

a technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to an analysis method for target electromagnetic scattering characteristics with uneven subdivision. Two background technology [0002] The target electromagnetic characteristics analysis of multi-scale shapes and materials is one of the difficulties in the current electromagnetic engineering design. A typical problem is to load multi-antenna systems on large platforms such as satellites and ships. In modeling, antennas need to be discretized with fine grids, and large platforms such as satellites and ships need to be discretized with coarse grids. Similarly, the part with large dielectric parameters needs to be discretized with fine grid, and the part with small parameter needs to be discretized with coarse grid. Therefore, the mesh obtained by modeling is a typical non-uniform subdivision mesh. The resulting ch...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李猛猛陈如山丁大志樊振宏
Owner NANJING UNIV OF SCI & TECH
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