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Numerical and Field Investigations of GPR: Toward an Airborne GPR

机译：GPR的数值和现场调查：迈向机载GPR

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The main objective of our work is to explore the feasibility of designing an airborne RADAR system much like the University of Texas Institute for Geophysics airborne ice-penetrating radar systems for use in the detection of underground structures. Here we summarize our initial efforts toward achieving this goal. The studies conducted so far include two major tasks: (1) development of hybrid numerical-analytical techniques for simulating the radar response of underground targets, and (2) a ground penetrating radar field experiment conducted at a known site that has underground tunnels. In our numerical simulation, we used analytic solutions to propagate the EM wave field from an airplane to the ground surface and then used a finite difference scheme to compute the response of complex geology including some underground structure. During the field investigation, we collected several surface GPR profiles with varying source-receiving antenna separations and configurations. The data were processed using algorithms similar to those used in seismic data processing. Despite the high moisture content in the field area during data collection, we were able to identify features in the data that can be modeled as diffractions from underground targets. The results are encouraging. Our future work will include revisiting the site during the summer months since we expect to be able to image the underground facilities better when the ground is dry. Based on the success of the ground based GPR field surveys, we will investigate the possibilities of designing and testing an airborne system.
机译：我们工作的主要目的是探索设计类似于德克萨斯大学地球物理研究所机载冰穿透雷达系统的机载雷达系统的可行性，以用于探测地下结构。在这里，我们总结了为实现该目标所做的初步努力。迄今为止进行的研究包括两个主要任务：（1）开发用于模拟地下目标雷达响应的混合数值分析技术，以及（2）在具有地下隧道的已知地点进行的探地雷达实地实验。在我们的数值模拟中，我们使用解析解将电磁波场从飞机传播到地面，然后使用有限差分方案来计算包括某些地下结构在内的复杂地质的响应。在现场调查期间，我们收集了具有不同接收源天线间隔和配置的几个表面GPR轮廓。使用类似于地震数据处理中使用的算法对数据进行处理。尽管在数据收集期间现场区域中的水分含量很高，但我们仍能够识别数据中的特征，这些特征可以建模为来自地下目标的衍射。结果令人鼓舞。我们的未来工作将包括在夏季重新访问该站点，因为我们希望在地面干燥时能够更好地对地下设施进行成像。基于地面GPR现场调查的成功经验，我们将研究设计和测试机载系统的可能性。

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