Environmental electromagnetic scattering characteristic analysis method for uncertain factors
A technology of electromagnetic scattering characteristics and analysis methods, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as uncertainty analysis, difficult three-dimensional actual target shape changes, etc., to achieve a small number of random variables, The effect of fast calculation speed
Active Publication Date: 2019-10-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology
Because the Monte Carlo method is affected by low convergence, although some improved Monte Carlo methods have also been proposed by scholars to improve its convergence, it is still difficult to conveniently and effectively describe the change of the three-dimensional actual target shape of multi-dimensional uncertain variables. Perform Uncertainty Analysis
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[0068] In this embodiment, a typical simulation of the electromagnetic scattering characteristics of a simple tree model with an uncertain size is carried out, and the simulation is implemented on a computing platform with a DELL Intel Xeon E7-4850 CPU 2.0GHz and a memory of 512GB. 5 media tree models such as figure 2 As shown, by using the non-rational B-spline surface modeling method, the 5 medium tree models can be constructed using 55 NURBS patches, and the model shape is controlled by 140 control points, such as image 3 shown. The median size of a single medium tree model in the three directions of x, y, and z is 0.8λ×0.8λ×2λ, and the change of the crown size is [-0.2λ, 0.2λ], where λ is the wavelength. In the 5 medium tree model, the size of the canopy is determined only by Figure 4 The z-direction coordinate control of the five control points is shown. Therefore, it is only necessary to set the z-direction coordinates of these 5 control points as random variables,...
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The invention discloses an environmental electromagnetic scattering characteristic analysis method for uncertain factors, and the method comprises the steps: building an environmental model through employing a non-rational B-spline surface modeling technology, wherein the uncertain factors of a target are controlled by the coordinates of control points on an NURBS surface, and ethe coordinates ofall control points are relatively independent; respectively setting the coordinates of the control points in each direction as random variables, placing triangular grids on the NURBS surface, and establishing a basis function represented by the random variables; aiming at the electromagnetic scattering characteristics of the analysis environment, establishing a surface area integral equation, andsubstituting the RWG primary function containing the random variable into the equation to obtain an integral equation containing the random variable, i.e., introducing the factor uncertainty of the environment into the integral equation; and finally, quantitatively predicting the electromagnetic scattering characteristics of the environment with factor uncertainty through a disturbance method. Themethod has the advantages of small number of random variables, no correlation, high calculation speed and the like.
Description
technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to an analysis method for environmental electromagnetic scattering characteristics of uncertain factors. Background technique [0002] In real life and practical engineering applications, due to the influence of manufacturing process, external environment and human factors, the uncertainty in the analysis system is ubiquitous, so the research on uncertainty has a long history. Many application fields such as hydrodynamics, fluid mechanics, and structural design involve this problem. This type of problem is usually caused by the uncertainty of parameters or inputs caused by manufacturing processes, human factors, etc., resulting in uncertainty in the relevant response output. In the field of electromagnetism, the uncertainty of the electromagnetic field system usually exists in geometric dimensions, material propertie...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 何姿陈如山丁大志樊振宏赵赟
Owner NANJING UNIV OF SCI & TECH