中文摘要：

综述了国内外透地通信技术的发展过程与研究现状,介绍了最新的透地通信及其相关技术的理论和实验研究成果,以最具代表性的国际知名透地通信产品PED系统、TeleMag系统、SWECS系统等产品为例,对透地通信系统在实际应用中的进展情况进行了阐述。指出目前透地通信系统中存在的信道容量小、抗干扰能力差、天线利用率低等问题,展望了透地通信技术的发展趋势。

英文摘要：

The development and current situation of through-the-earth communication technology at home and abroad were reviewed.The newest results of theoretical and experimental studies of through-the-earth communication technology were presented and the actual application status of through-the-earth communication system was demonstrated taking several most representative products offered by world-noted manufacturers as samples including the PED（personal emergency device）,the TeleMag,and SWECS（subterranean wireless electronic communication system）,etc.Finally,the paper pointed out problems existed in actual system,such as small channel capacity,poor anti-interference performance,low antenna utilization,and prospected the future developing trend of through-the-earth communication technologies.