Joint inversion method of dielectric constant and concealed target parameters of homogeneous background media

A dielectric constant and joint inversion technology, applied in the field of high-resolution imaging, can solve the problems of restricting the application of ground penetrating radar, large amount of calculation, inability to achieve joint inversion of medium electromagnetic parameters and target parameters, etc., to improve real-time processing capabilities. , the effect of reducing the amount of operation

Inactive Publication Date: 2010-12-15
CENT SOUTH UNIV
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Problems solved by technology

This processing method is based on step-by-step inversion, which has a large amount of calculation and low estimation accuracy, and cannot realize the joint inversion of medium electromagnetic parameters and target parameters, which restricts the application of ground penetrating radar.

Method used

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  • Joint inversion method of dielectric constant and concealed target parameters of homogeneous background media
  • Joint inversion method of dielectric constant and concealed target parameters of homogeneous background media
  • Joint inversion method of dielectric constant and concealed target parameters of homogeneous background media

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Embodiment 1

[0057] This example is aimed at two-dimensional detection and imaging, but this technology is not limited to two-dimensional areas, and is also applicable to detection and imaging of three-dimensional areas.

[0058] First set an imaging area, and set the dielectric constant of this area to be 16ε 0 , divide the region into 400 imaging units in the horizontal and vertical directions, and the number of units in both the horizontal and vertical directions is 20. figure 1 The spatial distribution of three scattering points in this area is given. Each scattering point is omnidirectional scattering and does not affect each other, that is, the scattering echo satisfies the linear superposition relationship. The gray value of each scattering point represents its scattering intensity value, and the scattering intensities of these three scattering points are 0.25, 0.25 and 0.5, respectively. When performing imaging detection in this area, the airspace sampling is in the form of rand...

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Abstract

The invention provides a joint inversion method of dielectric constant and concealed target parameters of homogeneous background media, which is realized by the following ways: firstly setting an estimation interval of a dielectric constant, then computing each estimation value in the interval to generate dictionary matrixes, then arranging the dictionary matrixes in rows to generate a joint dictionary matrix, carrying out optimization solution by utilizing imaging algorithm based on compressed sensing on the basis of the joint dictionary matrix to obtain a joint target matrix, then segmenting and extracting the joint target matrix and simultaneously obtaining the dielectric constant and the imaging results of the detection regions of the background media, thus improving the real-time detecting and imaging capabilities of the ground penetrating radars to a greater extent.

Description

technical field [0001] The invention belongs to the technical field of high-resolution imaging of ground penetrating radar, and relates to a joint inversion method of the permittivity of a uniform background medium and the parameter of a concealed target. technical background [0002] Ground penetrating radar is an effective non-destructive detection technology. It emits electromagnetic waves to the detection area and receives scattered echoes through airspace scanning, which can realize imaging processing inside unknown areas and obtain hidden target parameters in unknown areas, that is, target distribution information and scattering intensity information, which can be effectively used in municipal engineering and archaeology. , mine detection, anti-terrorism and other occasions. There are many imaging methods for ground penetrating radar. The imaging algorithm based on compressed sensing technology is based on the sparsity of the echo signal, the randomness of the measure...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38G01V3/12G01S13/89
Inventor 雷文太柳建新
Owner CENT SOUTH UNIV
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