Method for remodeling medium objects by electromagnetic inverse scattering

A medium target and electromagnetic scattering technology, applied in the electromagnetic field, can solve problems such as difficult to solve and complex use of the method of moments

Inactive Publication Date: 2016-06-15
TONGJI UNIV
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  • Abstract
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Problems solved by technology

The moment method with SWG as the basis function is the traditional method to solve the FSIE problem, but if the target background is non-uniform and the shape of the object is unknown, it is more difficult to solve
The SWG basis function is defined on a pair of tetrahedral elements, and the material interface needs to be known when the geometry is discrete, and there are surface charges on the contact surface of two different media, and the distribution of the surface charges needs to be known, which will lead to The method of moments is very complicated to use

Method used

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  • Method for remodeling medium objects by electromagnetic inverse scattering
  • Method for remodeling medium objects by electromagnetic inverse scattering
  • Method for remodeling medium objects by electromagnetic inverse scattering

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0072] For the selected three-dimensional dielectric body, for the receiving antenna and the reflecting antenna, the spherical measurement surface radius is 1.796m, and the image domain is a cube of 140mm×140mm×140mm. On the measurement plane, the position of the source field From 30° to 150°, the step size is 15°. θ s From 20° to 340° in steps of 40°. The receiving location is is 90°, θ s From 0° to 350°, the step size is 10°. Divide the image domain into 42156 tetrahedral elements.

[0073] During specific implementation, the method flow is as follows:

[0074] 1. Use Maxwell's equations to derive the electromagnetic field forward scattering integral equation (FSIE) and inverse electromagnetic field scattering integral equation (ISIE); 2. To guess the shape of the object, generally choose a cube that can surround the object to be mea...

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Abstract

The invention relates to a method for remodeling medium objects by electromagnetic inverse scattering. The method comprises following steps: utilizing Maxwell's equations and constitutive equations to deduce forward and reverse integral equations for electromagnetic scattering; guessing the shape of an object to be detected and discretizing integral equations with a method in order to obtain matrix equations; utilizing a Gauss-Newton minimization method to regularize ill-conditioned equations during the reverse scattering process following discretization, wherein used regularized parameters are obtained by a multiplicative regularization method; and adopting a born iterative method to carry out iteration and obtaining wave number of detected mediums at the needed precision in order to achieve the objective of remodeling mediums.The method helps to avoid the problem in the conventional method that parameters are obtained by a lot of experiment data so that solving efficiency is increased.

Description

technical field [0001] The invention belongs to the field of electromagnetic technology, and relates to an electromagnetic wave analysis method, in particular to a method for fast and efficient reconstruction of an unknown medium target through theoretical calculation of electromagnetic inverse scattering. Background technique [0002] Electromagnetic field or electromagnetic wave is ubiquitous around us, and it will interact with any object, material, structure, device, system, including our human body itself. It is of great significance to study and analyze the generation (radiation), propagation, and interaction with objects or targets of electromagnetic waves. It has a wide range of applications in communication, radar, navigation, electromagnetic compatibility design, biomedical imaging, and geophysical exploration. application. However, to understand and control the complex behavior of electromagnetic waves we must solve its governing equations. The behavior of elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 童美松万国春张允晶
Owner TONGJI UNIV
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