研究了瞬态电磁波在地层中的传输特性，为井中雷达系统设计和地层信息解释提供重要依据。通过对传播速度和衰减系数的理论计算，确定目标物与井眼间的距离以及井中雷达最大的探测距离。基于以上雷达波传输特性的理论研究，设计了一个井中雷达系统。为了验证该系统的工作性能，在石灰岩地层中开展了实验测试。实验结果表明：该雷达系统能够探测到距离井眼8 m 远的金属目标。

The borehole radar is a kind of geophysical exploration tool based on high-frequency pulse electromagnetic (EM) wave transmission for detecting subsurface information. In this work, the transmission characteristics of transient EM wave were studied for designing borehole radar system and interpreting subsurface information. Propagation speed and attenuation coefficient were theoretically studied to find out the distance between the target and the borehole, as well as the maximum detection range of the borehole radar. Based on the theoretical study, we designed a borehole radar system. In order to verify the system, field experiments were carried out in a limestone stratum. The experimental results demonstrate that the system can effectively detect a metal target 8 m away from the borehole.