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A Transient Field Far-Field Extrapolation Method for Computing Electromagnetic Scattering by Finite-Difference Time-Domain Method

A time-domain finite difference and electromagnetic scattering technology, applied in the field of electromagnetic field simulation, can solve problems such as complex calculation, and achieve the effect of simplifying calculation, improving efficiency, and simple time-frequency transformation form

Active Publication Date: 2017-09-19
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

Method used

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  • A Transient Field Far-Field Extrapolation Method for Computing Electromagnetic Scattering by Finite-Difference Time-Domain Method
  • A Transient Field Far-Field Extrapolation Method for Computing Electromagnetic Scattering by Finite-Difference Time-Domain Method
  • A Transient Field Far-Field Extrapolation Method for Computing Electromagnetic Scattering by Finite-Difference Time-Domain Method

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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 transient field far-field extrapolation method for calculating electromagnetic scattering by finite-difference time-domain method. Set the extrapolation boundary, and extrapolate the electric field and magnetic field on the extrapolation boundary to obtain the far field; 3. Set the transient incident wave, and update the electric field and magnetic field in each time step until the electromagnetic field distribution tends to a steady state; 4. Write the far field as the product of the frequency factor and the integral factor, and perform inverse Fourier transform on the integral factor to obtain the time domain expression; 5. Set the far field time domain response array of the integral factor; 6. The far field time domain response of the integral factor is obtained by Fourier transform to obtain its frequency domain response; 7. Using the frequency domain response of the far field and incident wave, the change of RCS with frequency is obtained. This method writes the far field as the product of the frequency factor and the integral factor, and the frequency-time transformation and time-frequency transformation forms of the integral factor are relatively simple, which simplifies the calculation and improves the efficiency.

Description

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. Background technique [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 the tot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
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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