孤立目标体特性影响地质雷达成像试验研究

Isolated target body features affect the experimental study on the geological radar imaging

在利用地质雷达进行目标探测时，常因探测目标的差异和对所得数据解析处理的不同，导致探测目标和探测环境难以判定等问题。针对该问题，通过对地质雷达探测技术的分析总结，利用LTD-2100地质雷达设备，进行了数种已知孤立目标物的探测试验，研究了孤立目标体在不同外界因素下的回波数据，得出相应的结论。结果表明：孤立目标体的尺寸、埋深、形状以及材质是影响其雷达成像的主要因素；孤立目标体周围介质对其成像有一定程度的影响，即在相同条件下，介质的介电常数越大，雷达数据的分辨率越低；采用不同频率天线对同一目标体进行探测，在探测深度允许的情况下，应选择频率较高的天线，以获得较大的分辨率，并有利于后期的分析解读。

In the period of using ground penetrating radar for target detection, some problems such as judging the target and detection-environment were led due to the differences of the targets and data-parsingprocessing. In allusion to this problem, the detection technology of ground penetrating radar was analyzed and summarized, several isolated target-detection tests were carried on with ground penetrating radar LTD-2100, and then corresponding conclusions were gotten after analyzing the echo data under different external factors. The results show that not only do the body, buried-depth, shape and material size of the isolated target are the main factors affect the radar imaging but also the medium around it has some influence, the greater the dielectric constant of the medium is, the lower the resolution of the radar data is. Antenna of higher frequency should be chosen to obtain better resolution, which is helpful for later analysis, as long as the detecting depth is allowed.