论文部分内容阅读
本文以在五个不同隧道中的实验数据为基础，分析了窄带ＵＨＦ无线电波在隧道中的传播特性，给出了表征空直隧道传播损耗的距离因子，并讨论了隧道中的行人、车辆及隧道弯曲度对传播特性的影响。研究表明，接收信号的慢衰落基本服从对数正态分布，快衰落在直遂道中满足Ｒｉｃｉａｎ分布，在弯曲隧道中Ｒａｙｌｅｉｇｈ分布并不能很好地模拟快衰落的分布。
Based on the experimental data in five different tunnels, this paper analyzes the propagation characteristics of narrow-band UHF radio waves in the tunnel, gives the distance factor to characterize the propagation loss of the free-air tunnel, and discusses the characteristics of pedestrian, vehicle and Influence of tunnel curvature on propagation characteristics. The results show that the slow fading of the received signal basically obeys the logarithm normal distribution, the fast fading satisfies the Rician distribution in the straight tunnel, and the Rayleigh distribution in the curved tunnel does not well simulate the fast fading distribution.