Finite difference time domain electromagnetic calculation carrier meshing method

A finite difference in time domain and grid division technology, which is applied in computing, electrical digital data processing, and special data processing applications. Problems such as low precision

Inactive Publication Date: 2013-09-18
XIDIAN UNIV
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Problems solved by technology

It can be seen that the existing research results have the following problems: (1) The accuracy of approximating the surface shape of the carrier is low (especially in the case of low frequency or large wavelength), while the shape of the carrier does not affect the coupling degree between the antennas, the antenna patte...

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  • Finite difference time domain electromagnetic calculation carrier meshing method
  • Finite difference time domain electromagnetic calculation carrier meshing method
  • Finite difference time domain electromagnetic calculation carrier meshing method

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[0164] The present invention is Image 6 The carrier antenna model shown is divided into grids. The model contains 4 antennas, numbered 1, 2, 3, and 4. The length of antenna 1 is 3 meters, and the length of antenna 2, 3, and 4 is 1.8 m, the carrier surface elements are 18 general quadrilateral patches, and the bottom points of the 4 antennas are in the same quadrilateral patch.

[0165] Traverse the carrier antenna model data, calculate the span value of the model on the x, y, z coordinate axes, take the maximum span value as the side length, and establish the root node, the side length of the root node is 4.79 meters (such as Figure 7 shown).

[0166] Assuming that the surface approximation accuracy ε=0.02m, when the wavelength λ=11.5m, the calculated theoretical recursion depth is 2. Divide the nodes, keep black nodes and gray nodes, when the recursion depth is 2, the total number of black nodes and gray nodes is 16 (such as Figure 8 As shown), the calculated surface av...

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Abstract

The invention discloses a finite difference time domain electromagnetic calculation carrier meshing method. According to the method, the mesh size is jointly controlled by the discrete electrical dimensional accuracy and the carrier surface approximation accuracy, the geometrical approximation degree between the divided mesh model and the carrier model is high especially under the situation of low frequency with large wavelength, finite difference time domain electromagnetic calculation is performed on the basis of the mesh model, and the calculation result is relatively accurate; surface approximation accuracy controlling parameters for meshing the mesh model are provided, the blindness of meshing precision control of the conventional direct subdivision method is avoided, and the calculated amount for meshing can be effectively controlled; when mesh refinement is required, all that is needed is to perform octree recursive subdivision to the black nodes in the bottommost layer, and mesh refinement is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility, and relates to a grid division method for numerical analysis of electromagnetic fields, in particular to a carrier grid division method for time-domain finite-difference electromagnetic calculations, which can be used for research on electromagnetic field calculations by time-domain finite-difference methods. Background technique [0002] With the rapid development of modern science and technology, the carriers of mobile communication systems, such as vehicles, aircraft, and ships, are loaded with various electronic devices with different functions and various antennas for receiving and transmitting signals. Due to various wireless electronic devices and communication The increase in equipment density leads to denser electromagnetic signals between communications, and a gradual increase in frequency spectrum overlap, which makes the electromagnetic environment worse. Issues ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 许社教邱扬田锦许海宾杜美玲张建国
Owner XIDIAN UNIV
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