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Method of calculating far extrapolation of transient field of electromagnetic scattering through finite difference time domain

A time domain finite difference, electromagnetic scattering technology, applied in the field of electromagnetic field simulation, can solve problems such as complex calculation

Active Publication Date: 2015-04-29
北京博奥瑞科技有限公司
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Problems solved by technology

The traditional method of 3D transient field far-field extrapolation requires differential calculation of the far-field time-domain response, and the calculation is more complicated

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  • Method of calculating far extrapolation of transient field of electromagnetic scattering through finite difference time domain
  • Method of calculating far extrapolation of transient field of electromagnetic scattering through finite difference time domain
  • Method of calculating far extrapolation of transient field of electromagnetic scattering through finite difference time domain

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Such as figure 1 Shown, a kind of time domain finite difference method of the present invention calculates the transient field far field extrapolation method of electromagnetic scattering, and it comprises the following steps:

[0036] Step 1: Divide the calculation area into the total field area and the scattered field area by connecting the boundaries. The electromagnetic field in the total field area includes the incident field and the scattered field, while the electromagnetic field in the scattered field area only includes the scattered field;

[0037] Step 2: Set a closed extrapolation boundary in the scattered field area for far-field extrapolation;

[0038] Step 3: Set the transient incident wave, and update the electric field and magnetic field sequentially at each time step until the electromagnetic field distribution tends ...

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Abstract

A method of calculating far extrapolation of a transient field of electromagnetic scattering through finite difference time domain includes the steps of 1 dividing an area to be calculated into a main field area and a scattering field area according to the connecting boundary; 2 setting an extrapolation boundary in the scattering field area, and extrapolating electric fields and magnetic fields on the extrapolation boundary to obtain a far field; 3 setting transient incident waves, and sequentially updating the electric fields and the magnetic fields at each time step until the electromagnetic field distribution becomes steady; 4 writing the far field into a product of frequency factors and integral factors, and performing inverse Fourier transform on the integral factors to obtain a time domain expression; 5 setting an integral factor far field time domain response array; 6 performing Fourier transform on integral factor far field time domain response to obtain integral factor far field frequency domain response; 7 using far field and incident wave frequency domain response to obtain RCS (Radar Cross Section) changes with frequency. The method of calculating far extrapolation of the transient field of electromagnetic scattering through finite difference time domain writes the far field into the form of the product of the frequency factors and the integral factors due to the fact that the forms of frequency-time transform and time-frequency transform of the integral factors are simple, thereby simplifying the calculation and improving the efficiency.

Description

1. Technical field [0001] The invention provides a transient field far-field extrapolation method for calculating electromagnetic scattering by a finite-difference time-domain method, which specifically relates to an electromagnetic simulation method of a finite-difference time-domain (FDTD) method, belonging to electromagnetic field simulation technology field. 2. Background technology [0002] The finite difference time domain method (FDTD) is an important method of electromagnetic simulation and has been widely used in the electromagnetic field. The basic principle of this method is to discretize Maxwell's equations into a differential format, and use the interlaced characteristics of Yee's grid in space and time to realize the alternate update of electric field and magnetic field, and obtain the distribution of electromagnetic field with space and time. When using FDTD to calculate the electromagnetic scattering of the target, the calculation area is first divided into ...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 姬金祖吴洪骞黄沛霖
Owner 北京博奥瑞科技有限公司
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