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Compound electromagnetic scattering value simulation method of electrically large complex object and rough surface background

A numerical simulation, composite electromagnetic technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, radio wave measurement systems, etc., can solve the problem of not considering the impact of target imaging

Inactive Publication Date: 2011-09-07
FUDAN UNIV
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  • Application Information

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Problems solved by technology

In addition, the influence of the background environment on the target imaging is often not considered

Method used

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  • Compound electromagnetic scattering value simulation method of electrically large complex object and rough surface background
  • Compound electromagnetic scattering value simulation method of electrically large complex object and rough surface background
  • Compound electromagnetic scattering value simulation method of electrically large complex object and rough surface background

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Experimental program
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Embodiment Construction

[0099] Simulation results

[0100] The present invention uses 3 examples to verify the feasibility of the three-dimensional object scattering imaging and reconstruction algorithm: regular square prism ( figure 2 ), tanks, tanks placed on random rough ground ( Figure 15 ). Solve the backscattering field numerically with BART , and then use these data for three-dimensional imaging; also use the FEKO-PO algorithm to solve the scattering field of the first two models and perform imaging for verification and comparison.

[0101] A. Regular prism model

[0102] Calculation example 1: Using BART and FEKO, calculate as figure 2 The backscattering field of a regular square prism with an ideal metallic conductor is shown. The side lengths of the top surface and the bottom surface of the square prism are 0.4 m and 1.0 m respectively, and the height is 1.0 m. Horizontally polarized plane electromagnetic waves irradiate the target area, and the frequency of SF radar is from 1.0 G...

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Abstract

The invention belongs to the technical field of radar target imaging and monitoring, in particular relates to a compound electromagnetic scattering value simulation method of electrically large complex object and rough surface background. The method comprises the following steps of: synthesizing a two-dimensional arc aperture by using a frequency stepping radar in a down spotlight mode, simulating (observing) a electromagnetic scattered radar echo value of a electrically large complex three-dimensional target through the frequency stepping radar to obtain a three-dimensional back scattering matrix containing amplitude and phase; obtaining a uniform re-sampling data in an X-Y-Z coordinate system through a three-dimensional interpolation in a wave number domain; performing the three-dimensional rapid Fourier conversion on the re-sampling data to obtain a three-dimensional focus image to further reconstruct a geometric feature of the three-dimensional complex target. A numerical value execution result proves that the compound electromagnetic scattering value simulation method has feasible, accurate and high-efficient performance in the simulation of the three-dimensional complex target scattering monitoring, radar imaging and geometric feature reconstructing on a rough surface background.

Description

technical field [0001] The invention belongs to the technical field of radar target imaging and monitoring, and in particular relates to a composite electromagnetic scattering numerical simulation method of an electrically large complex body target and a rough surface background. Background technique [0002] The detection technology that uses radar to identify and scatter targets in the natural background, and then inverts and reconstructs the important geometric features of the target has very important applications in both civilian and military fields. For example, identifying targets such as vehicles, tanks, and ships under vegetation or on the background of the ground and sea, searching and rescuing survivors buried in natural disasters such as earthquakes or avalanches, and detecting hidden targets under sheltered conditions. [0003] Documents 21~4 have proposed two-dimensional radar wave imaging to detect targets behind walls. However, the 2D radar image is the proj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 金亚秋戴俊文
Owner FUDAN UNIV
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