Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Three-dimensional electromagnetic imaging method based on contrast source inversion algorithm

An inversion algorithm and three-dimensional electromagnetic technology are applied in the radio wave measurement system, radio wave reflection/re-radiation, and use of re-radiation, etc., to avoid forward calculation, benefit efficiency and stability, and improve quality.

Inactive Publication Date: 2013-01-02
TIANJIN POLYTECHNIC UNIV
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no nonlinear algorithm that satisfies all of the above conditions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional electromagnetic imaging method based on contrast source inversion algorithm
  • Three-dimensional electromagnetic imaging method based on contrast source inversion algorithm
  • Three-dimensional electromagnetic imaging method based on contrast source inversion algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] There are 2 non-uniform dielectric targets: "twocubes" and "cubespheres". The three-dimensional measured electromagnetic data are all obtained in the darkroom, where the transmitting antenna is a parabolic antenna and the receiving antenna is a horn antenna. The test settings are as follows: figure 2 As shown, taking spherical coordinates as an example, the transmitting antenna moves on a spherical surface with a distance of 1.796 meters from the center of the test setup; the azimuth angle φ s (azimuthal angle) changes from 0° to 320°, each change is 40°; polar angle θ s (polar angle) is changed from 50° to 150°, and each change is 15°; thus, a total of 81 transmitting antennas are distributed on a spherical surface with a radius of 1.796 meters. The distance between the receiving antenna and the center of the test setup is also 1.796 meters; the azimuth angle φ r =90°, which is located on the plane of z=0; polar angle θ r Expressed as follows:

[0060] θ r = θ s ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An application of three-dimensional imaging to the field of practical engineering such as nondestructive inspection, medical imaging, ground surface detection, geophysical exploration and the like is of great potential. As approximate treatment is adopted in a linear imaging algorithm, a reconstructed image is limited in precision and accuracy; and while in a non-linear algorithm such as a contrast source inversion (CSI) algorithm, position, shape and material parameters of an image such as an interested target can be gradually improved in an iteration process, and an image most similar to the interested target is reconstructed at last. The invention discloses a nonlinear imaging method for multi-frequency multi-transceiver three-dimensional electromagnetic actual measurement data based on the contrast source inversion algorithm combining a frequency hopping method with a regularization method. As forward calculation is not needed, a calculation amount for calculating a three-dimensional dyadic green function operator and a conjugate operator of the function operator in the iteration process is controllable, and a reconstruction result proves that the method can be widely applied to the field of practical applications with requirements of high-precision and high-resolution imaging due to precision and feasibility of an application to three-dimensional electromagnetic imaging.

Description

technical field [0001] The application of 3D microwave imaging in practical engineering fields such as non-destructive testing, medical imaging, surface detection, and geophysical exploration has great potential. Electromagnetic imaging is an inverse problem with nonlinear and ill-conditioned characteristics, which is difficult to solve, so accurate imaging algorithms are urgently needed. At present, most of the mature algorithms used in practical applications are linear algorithms. Due to the use of approximate processing, the resolution and accuracy of the reconstructed image are very limited. The nonlinear algorithm can gradually improve the image in the iterative process, such as the position, shape and material physical parameters of the target of interest, and finally obtain the image that is the closest to the target of interest. The ongoing National 863 Program - "Application and Research on Scientific Data of Lunar Exploration Engineering" clearly proposes the resear...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/89
Inventor 缪竟鸿戈立军耿磊
Owner TIANJIN POLYTECHNIC UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com