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Method for extracting electromagnetic characteristics of multi-dimensional uncertain non-uniform medium target based on volume-surface integral equation

A technology of volume fractionation and uncertainty, applied in the fields of electromagnetic field characteristics, instruments, complex mathematical operations, etc., can solve the problems of slow convergence speed and long calculation time, and achieve the effect of reducing calculation time

Pending Publication Date: 2022-03-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for each different random number, the Monte Carlo method needs to recalculate the solution of the problem to be sought. Although the structure of the program is simple and easy to understand, its convergence speed is slow and the calculation takes a long time

Method used

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  • Method for extracting electromagnetic characteristics of multi-dimensional uncertain non-uniform medium target based on volume-surface integral equation
  • Method for extracting electromagnetic characteristics of multi-dimensional uncertain non-uniform medium target based on volume-surface integral equation
  • Method for extracting electromagnetic characteristics of multi-dimensional uncertain non-uniform medium target based on volume-surface integral equation

Examples

Experimental program
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Effect test

Embodiment 1

[0083] In this embodiment, the electromagnetic scattering calculation of a medium cube with an uncertain shape is carried out. This embodiment is implemented on a computing platform with an Inter(R)Core(TM)i7-7700K CPU@3.6GHz and a memory of 8GB. A medium cube model such as image 3 As shown, the side length of the cube is 0.5m, and the dielectric constant ε r =(2,0). By using the NURBS surface modeling method to model, the cube model can be constructed using 6 NURBS surfaces, controlled by 8 control points. The change range of the cube is [-0.05m,0.05m], which is determined by such as image 3 The Z direction coordinate control of the 4 control points shown. Therefore, it is only necessary to set the z-direction coordinates of these 4 control points as random variables. The plane wave incident frequency is 300MHZ, and the direction is θ=0 0 , where θ is the pitch angle, is the azimuth angle. The viewing angle is θ=0~1800, Using the same incident wave setting, the Mo...

Embodiment 2

[0088] In this embodiment, the calculation of electromagnetic scattering is performed on a dielectric cylinder model with an uncertain shape and an uncertain permittivity. The height of the medium cylinder is 0.5m, the radius is 0.1m, and the dielectric constant of the medium is ε r =(2,0). The distribution of control points on the NURBS surface is as follows: Figure 5 As shown, the z coordinate of the control point shown in the figure is used as a random variable to control the height of the medium cylinder, and the range of variation is [-0.05m, 0.05m]. At the same time, the range of dielectric constant of the cylinder is [-0.1, 0.1], the incident wave and observation angle settings are consistent with Example 1. Similarly, the RCS statistical results of the method of the present invention are compared with the Monte Carlo method of sampling 1000 times, and the comparison results are as follows Figure 6 As shown, it can be seen that the two curves fit very well, which s...

Embodiment 3

[0093] In this embodiment, the calculation of electromagnetic scattering is performed on a multi-medium prism model with an uncertain shape and an uncertain dielectric constant. The prism is divided into three kinds of media such as Figure 7 As shown, the length of the bottom surface of the first part is 0.3m, the length of the top surface is 0.2m, and the height is 0.2m. The dielectric constant of the medium 1 is ε 1 =(3,0), the length of the bottom surface of the second part is 0.4m, the length of the top surface is 0.3m, the height is 0.2m, and the dielectric constant of medium 2 is ε 2 =(2,0), the length of the bottom of the third part is 0.5m, the length of the top is 0.4m, the height is 0.2m, and the dielectric constant of medium 3 is ε 3 =(1.5,0). The distribution of control points on the NURBS surface is as follows: Figure 7 As shown, the z coordinates of the four control points are used as random variables to control the height of the dielectric prism, and the ra...

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Abstract

The invention discloses a multi-dimensional uncertain non-uniform medium target electromagnetic characteristic extraction method based on a volume-surface integral equation, and the method comprises the following steps: firstly, building a model for a target through employing a non-rational B-spline technology and ANSYS software, and further controlling the tiny deformation of the target through employing several control points as shape random variables; the change of the dielectric constant of the medium can be controlled through the random variable of the dielectric constant, then the random variables of the shape and the dielectric constant are introduced into a volume-surface integral equation through a disturbance method, and finally each disturbance current is iteratively solved by sampling the variable quantity of the random variable for multiple times; and calculating the radar cross section of the target model after the appearance or the dielectric constant is slightly changed, and the statistical mean and variance of all RCS responses. According to the method, the influence caused by tiny deformation of the appearance of the target or tiny jitter of the dielectric constant can be considered.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of electromagnetic scattering characteristics of a target, in particular to a method for extracting electromagnetic characteristics of a multi-dimensional uncertain inhomogeneous medium target based on a volume integral equation. Background technique [0002] In general electromagnetic analysis problems, the geometric shape of the target is kept unchanged under ideal conditions, so the electromagnetic properties of the target with a definite shape are analyzed. However, due to the influence of manufacturing process, external environment, and human factors, there are uncertainties in the geometric shape and dielectric constant of the target in actual situations. In order to analyze the uncertainty of shape and permittivity, the derivative form of the volume integral equation (VSIE) is introduced. The volume integral equation can solve the problem of the scattering characteristics of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00G06T17/20G06F17/13G01R29/08
CPCG06T17/00G06T17/20G06F17/13G01R29/08
Inventor 何姿李世玺顾鹏飞丁大志樊振宏
Owner NANJING UNIV OF SCI & TECH
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