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Through-wall imaging method based on image domain wall influence compensation

An imaging method and technology in the image domain, which can be used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc. The effect of meeting high computational efficiency requirements

Active Publication Date: 2012-06-27
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, the method is computationally intensive
Because in the determination of wall thickness, multiple imaging is required, and the amount of calculation is greatly increased

Method used

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  • Through-wall imaging method based on image domain wall influence compensation
  • Through-wall imaging method based on image domain wall influence compensation
  • Through-wall imaging method based on image domain wall influence compensation

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Experimental program
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Embodiment Construction

[0038] The through-wall imaging method based on image domain wall effect compensation is divided into four steps, such as figure 1 shown. The present invention will be further explained below in conjunction with the data acquired by XFDTD electromagnetic simulation software.

[0039] In the simulation, the thickness of the wall is 0.2m, and the relative permittivity is 3.24. The vertical distance between the antenna and the wall is 8m, and the target is placed 2m behind the wall. The first-order differential Gaussian signal is selected as the input excitation source, and the entire calculation area is truncated by a perfectly matched layer to meet the absorption boundary condition.

[0040] Step 1: Determine the imaging coordinate system. figure 2 The left side is the 2D side view of XY, YZ and ZX of the scene from top to bottom, and the right side is the 3D view of the scene. Take the straight line where the antenna aperture point is located as the X-axis, take the strai...

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Abstract

The invention discloses a through-wall imaging method based on image domain wall influence compensation. The basic idea of the method is as follows: firstly, performing imaging processing on the echo data through the conventional imaging algorithm; then, determining an optimal parameter in a compensating factor by using the obtained image and the image domain filtering result thereof under the condition of having no wall prior knowledge; and finally, executing wall influence compensation for the imaging result by the compensation factor. The method comprises the following specific steps of: step 1, determining an imaging coordinate system; step 2, executing initial imaging processing on the echo data; step 3, calculating an image domain compensation factor; step 4, executing the image domain wall compensation. The method of the invention can simultaneously finish compensation of multiple targets just by once imaging processing on the wall compensation, thereby meeting the requirement of high computational efficiency in practical applications.

Description

technical field [0001] The invention belongs to the technical field of ultra-wideband synthetic aperture radar imaging, in particular to an imaging method based on wall influence compensation in the image domain. Background technique [0002] Ultra-Wideband Synthetic Aperture Radar combines ultra-wideband technology with synthetic aperture technology. The emitted electromagnetic waves have low-frequency penetration and excellent azimuth resolution capabilities, enabling high-resolution imaging of targets behind walls and even building structures, which greatly enhances the accuracy of targets. Information acquisition ability. Due to the influence of the wall occlusion, the electromagnetic wave will produce energy attenuation, reflection, refraction and slowing down when it penetrates the wall. Using the antenna to receive the echo for imaging will cause positioning deviation, image defocus and even false targets, etc. Therefore, in the through-wall imaging, it is necessary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 金添周智敏孙鑫陆必应
Owner NAT UNIV OF DEFENSE TECH