基于正演模拟的地下典型目标体探地雷达图像特征分析与评价

目前探底雷达应用领域越来越广，但探底雷达剖面图的信息解译缺乏系统性的标准。本文论述了水平层状目标体，圆形目标体，矩形目标体，地下管道，局部含水层，石油污染物六种地下典型目标体模型正演模拟的图像特征。运用二维时域有限差分法构建污染场地中六种地下典型目标体的正演模型，并获得地下典型目标体雷达剖面图，进一步汇总在正演模拟剖面图中的各个典型目标体的图像识别特点，并分析雷达探测过程中多次波、绕射波等杂波的形成机理，最后通过石油烃污染场地的钻探资料验证实测探地雷达图形特征分析的准确性。本研究为实际工作中探地雷达的反射信号解译和地下目标体的识别提供了一定的理论依据。

Ground Penetrating Radar for Typical Underground Target based on Forward Modeling Image Feature Analysis and Evaluation

At present, the application of bottom-dipping radar is more and more extensive, but the information interpretation of bottom-dipping radar profile is lack of systematic standard. This paper discusses the image characteristics of forward modeling of six typical underground target models: horizontal layered target, circular target, rectangular target, underground pipeline, local aquifer, and petroleum pollutants. The two-dimensional finite-difference Time-domain method was used to construct the forward modeling model of six typical underground targets in the contaminated site, and the radar profile of the typical underground targets was obtained. The image recognition characteristics of each typical target in the forward simulation profile were further summarized, and the formation mechanism of clutter such as multiple waves and diffraction waves in the radar detection process was analyzed. Finally, the accuracy of Ground Penetrating Radar graphic feature analysis is verified by drilling data of petroleum hydrocarbon polluted site. The research provides a theoretical basis for the interpretation of reflected signals of ground penetrating radar and the identification of underground targets in practical work.