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首页> 外文期刊>Journal of Applied Geophysics >Simulation and analysis of GPR signal based on stochastic media model with an ellipsoidal autocorrelation function
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Simulation and analysis of GPR signal based on stochastic media model with an ellipsoidal autocorrelation function

机译:基于具有椭圆自相关函数的随机介质模型的GPR信号仿真与分析

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摘要

Target detection using ground penetrating radar (GPR) is based on the contrast between the electrical parameters of the target and the background medium, such as dielectric permittivity, conductivity and permeability. The application mainly concentrates on the detection of the medium interface and the target shape. In any theoretical study, a simulation model is built with a homogeneous medium. However, real detection encounters heterogeneous media which might produce scattering and diffraction at electrical interfaces and distort the radar pulse shape and affect the detection resolution. In this paper, we build multi-scale random media model with an ellipsoidal autocorrelation function and use FDTD method to simulate the GPR signal response. We then estimate and analyze the arrival time, layer thickness, permittivity and the physics relation in different scale random models according to the S transform method and the transmission wave method. The results demonstrate that we can use GPR to obtain geophysical information of multi-scale heterogeneous media, and provide a foundation for real media detection and complex media inversion.
机译:使用探地雷达(GPR)进行目标检测是基于目标和背景介质的电参数之间的对比度,例如介电常数,电导率和磁导率。该应用程序主要集中在介质界面和目标形状的检测上。在任何理论研究中,均使用均质介质构建仿真模型。但是,实际检测会遇到异质介质,这些异质介质可能会在电接口处产生散射和衍射,并使雷达脉冲形状失真并影响检测分辨率。在本文中,我们建立了具有椭圆自相关函数的多尺度随机媒体模型,并使用FDTD方法来模拟GPR信号响应。然后,根据S变换法和透射波法,估计并分析了不同尺度随机模型中的到达时间,层厚,介电常数和物理关系。结果表明,利用GPR可以获取多尺度异质介质的地球物理信息,为实际介质探测和复杂介质反演提供基础。

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