山区公路隧道移动通信系统

Mobile communication system in highway tunnel at mountain area

阐述了建立山区公路隧道移动通信系统的重要性和隧道移动通信系统的电波传播特性,研究了在公路移动通信系统中采用泄漏同轴电缆、射频定向传输、增加直放站等几种方案来消除信号场强覆盖死区的方法。对各种方案优缺点进行了比较,分析了八字槽形泄漏同轴电缆的场强特性及在隧道中信号场强的衰耗问题,并对此做了相应的分析和计算。

This paper demonstrated the importance of the mobile communication system in highway tunnel and the characteristics of the electric wave of transmission in the above system. Several schemes to eliminate the dead areas of electric field in the mobile communication system such as making use of the coaxialcable and the radio frequency directional transmission were put forward. The comparison on the previous schemes was carried out. The characteristics of the intensity of the electric field was analyzed by using the leakage coaxialcable. The loss of the electric field was calculated.