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基于探地雷达工作原理与二维FDTD正演模型,研究了在不同天线频率与天线间距的雷达测试参数下的管线雷达图像特征,分析了管线材质、管径、埋深和埋地介质等因素对管道雷达图像中双曲线特征的影响规律,对比了管线与不同几何形状空洞地质体的雷达图像差异。通过图谱规律的分析与研究,总结了复杂条件下探地雷达检测地下管线的图像识别规律,明确了实测探地雷达图像判识过程中目标图谱的典型特征。对提高地下管线雷达图像解释的合理性具有积极的促进作用,也为进一步开展探地雷达图像的反演研究奠定了基础。
Based on the working principle of ground penetrating radar and two-dimensional FDTD forward model, the characteristics of pipeline radar image under radar test parameters with different antenna frequencies and antenna spacings are studied. The factors such as pipeline material, pipe diameter, buried depth and buried media are analyzed The influence law of hyperbolic characteristics in pipeline radar image is compared with that of radar image of pipelines with different geometric hollow cavities. Through the analysis and study of the regular pattern of the map, the law of image recognition of the underground pipelines detected by GPR under complex conditions is summarized, and the typical features of the target map in the ground penetrating radar image identification process are clarified. Which has a positive effect on improving the rationality of underground pipeline radar image interpretation and lays the foundation for further research on the inversion of GPR images.