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Background medium iteratively-updated quantitative microwave imaging method based on multiplicative regularization

An iterative update, microwave imaging technology, applied in measurement devices, radio wave measurement systems, reflection/re-radiation of radio waves, etc., can solve the problem of difficult imaging of high dielectric constant scatterers

Inactive Publication Date: 2019-08-20
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that current imaging methods are not easy to image high dielectric constant scatterers, and propose a quantitative microwave imaging method based on multiplicative regularization and iterative update of the background medium

Method used

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  • Background medium iteratively-updated quantitative microwave imaging method based on multiplicative regularization
  • Background medium iteratively-updated quantitative microwave imaging method based on multiplicative regularization
  • Background medium iteratively-updated quantitative microwave imaging method based on multiplicative regularization

Examples

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Effect test

Embodiment 1

[0067] In this example, the simulation data is used to verify the proposed microwave imaging method of iteratively updating the background medium. The structure of the scatterer in the simulation example is as follows: figure 1 shown. The size of the detection area is a cubic area with a side length of 2. The relative permittivity of the unknown scatterers in the detection area is 2.5, and the initial background of the detection area is air. The entire detection area is discretized into a 60×60 grid, and under the illumination of the incident field, the reconstruction effect of the image is as follows: figure 2 As shown, under normal circumstances, due to the small error of the imaginary part, it is generally ignored, and the real part image is the main one, and the image reconstruction effect without the regularization term image 3 compared to, figure 2 The reconstruction effect is very good, very similar to the original image, and the image 3 The effect is very poor,...

Embodiment 2

[0069] In order to verify the imaging effect of the actual scatterer by the quantitative microwave imaging method based on multiplicative regularization and iterative update of the background medium designed in the present invention, this example 2 carried out inversion imaging on the actual scatterer material, and the structural device of the scatterer is as follows Figure 4 As shown, the background of the detection area is Teflon material with a relative permittivity of 2, and the unknown scatterer is a circular cylinder with a relative permittivity of 3. The scattered field data of the scatterer is obtained by the incident field irradiation. And perform image inversion and reconstruction. Figure 5 For the reconstruction effect of the method of the present invention, we can clearly see the position, size and dielectric constant of all substances in the detection area from the inverted image. It is further demonstrated that the proposed imaging method has high accuracy and ...

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Abstract

The invention discloses a background medium iteratively-updated quantitative microwave imaging method based on multiplicative regularization, and aims to re-construct information, such as the position, the shape and the size of a scattering body possibly existing in a detection area, so that useful information can be obtained rapidly and accurately. The method can be used in the fields of breast cancer detection, geological prospecting, early radar warning and the like. The method in the invention has the advantages that: background parameters are iteratively updated; therefore, time-consumingcalculation of a non-uniform background green function is avoided; and the calculation cost is greatly reduced. On the basis of the scheme, in combination with a sub-space optimization method, a novel background medium iteratively-updated quantitative optimization method based on a difference integral equation model is provided, so that image reconstruction is realized; furthermore, a multiplicative regularization technology is used; the stability and the accuracy of an iteration process are improved; a result shows that: the provided method has very good convergence performance and rapid calculation speed, can relieve nonlinearity, and can very clearly invert relative parameters of an unknown scattering body, such as the position, the shape, the size and the electric parameter; and the effectiveness of the method is verified through simulation tests and experimental tests for many times.

Description

technical field [0001] The invention belongs to the technical field of microwave imaging, and relates to a quantitative microwave imaging method suitable for scenes with large contrast of unknown scatterers, in particular to a quantitative microwave imaging method based on multiplicative regularization and iterative update of background medium. Background technique [0002] In production practice, microwave imaging methods play a very important role in various fields, such as geological exploration, biomedical imaging, military radar, etc. In the past, we humans often intuitively obtain information from the outside world through our own sensory organs. However, this kind of intuitive feeling, the information obtained is relatively limited, such as the detection of underground mineral veins, tumors inside the human body, etc., and it is impossible to directly obtain intuitive and accurate information through the senses, which has great limitations. In order to overcome the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 徐魁文楚彦青
Owner HANGZHOU DIANZI UNIV