Application of FDTD numerical simulation of Ground Penetrating Radar inpipeline detection
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摘要: 探地雷达是一种非常重要的管线探测技术，为了提高地下管线雷达图像特征的认识，确定管线异常体的位置，提高雷达资料的解释精度.论文从Maxwell两个旋度方程出发，推导了二维TM波的差分方程、CFL数值稳定性条件、频散关系.然后，基于Matlab平台编写了探地雷达正演的FDTD程序，应用该FDTD程序开展了管线探测中探地雷达探测效果分析，包括对管线埋藏深度、管线间距、管线内物质、管线材质等影响因素的数值模拟.通过分析雷达正演剖面特征，可以清晰了解并掌握雷达管线探测与各种影响参数之间的关系，对实际地下管线探测可起到指导作用.最后，将GPR应用于武广高速浏阳河隧道管线探测中，GPR准确地定位了PVC通迅电缆的位置在埋深，为工程施工与处置提供了依据.Abstract: Ground Penetrating Radar(GPR) is a very important pipeline detection technology, in order to increase awareness of the underground pipeline the radar image features. Determine the location of the pipeline anomalies and improve the accuracy of interpretation of radar data. The paper is from Maxwell two curl equations, to derive two-dimensional TM wave differential equations, CFL numerical stability condition and dispersion relations. Then, based on Matlab platform prepared a ground penetrating radar forward the FDTD program, the application of the FDTD program launched pipeline detection in ground penetrating radar effectiveness analysis. The paper is the numerical simulation about a number of factors of the pipeline burial depth, spacing between pipelines and the different materials in pipelines. By analyzing the characteristics of the radar forward cross-section, we can clearly understand and grasp the radar detection pipeline with various parameters affect the relationship. This can play a guiding role of the actual underground pipeline detection. Finally, the GPR is applied to the Liuyang River Tunnel of Wuhan-Guangzhou high-speed pipeline detection, the GPR accurately locate the position and depth of PVC communication cables, for the construction and disposal provided.
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