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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.
Ground Penetrating Radar (GPR) is a very important pipeline detection technology, in order to raise awareness of the characteristics of underground pipeline radar image, determine the location of the abnormal body of the pipeline and improve the interpretation accuracy of radar data.According to Maxwell’s two curl equations, FDTD differential equations, CFL numerical stability conditions, dispersion relation.After that, the FDTD program for GPR forward based on the Matlab platform was compiled and the FDTD program was used to analyze the detection effect of GPR in pipeline exploration, including The numerical simulation of influencing factors such as buried depth of pipeline, pipeline spacing, pipeline material, pipeline material, etc. By analyzing the characteristics of forward profile of radar, the relationship between radar pipeline detection and various influence parameters can be clearly understood and mastered. The pipeline detection can play a guiding role.Finally, using GPR in the detection of Liuyanghe tunnel in Wu-Guang highway, GPR accurately locates the location of PVC communication cable and provides the basis for construction and disposal.