基于FDTD数值技术分析反向障碍物对探地雷达采集数据的影响

为了分析与雷达探测方向相反方向的障碍物对雷达采集数据的影响，以探地雷达理论为基础，运用时域有限差分法（FDTD），建立相应的地质模型，进行探地雷达二维正演模拟。结合工程实例，对福建某隧道的雷达探测数据进行分析研究。研究结果表明，在使用探地雷达进行目标体探测时电磁波并非仅向探测方向发射和传播，在天线的四周都会有电磁波发射出来，而非探测方向上的电磁波将会对雷达采集的数据产生一定的影响，干扰数据解释人员解译的准确性。因此在使用探地雷达和解译雷达数据时，要了解现场环境和剔除干扰波，做到对探测目标体的正确判断。 

FDTD numeric technique-based analysis of the influence of reverse obstacle on data acquisition of ground penetrating radar

In order to analyze the influence of obstracle in the opposite direction to radar deetction direction on data acquisition of ground radar, based on radar theory, using the finite difference method of time domain, the paper set up the corresponding geological model to conduct two-dimension forward modeling of ground penetrating radar. In combination with engineering cases, the data of radar detection in a tunnel in Fujian Province were analyzed and studied. The research results show that when a ground penetrating radar was used to detect a target object, electromagnetic wave did not emit nor propagate towards the detection direction, and electromagnetic waves would emit around the antenna, while the electromagnetic wave which was not at the detection direction would have some influence on the data acquired by the radar, disturbing the accuracy of data interpretation. Therefore, during utilization of the ground penetrating radar and interpretation of ground radar data, the site environemts must be known and the interference wave must be removed so as to achieve the correct judgement of the detected target object.