矿山无线射频信号传播特性试验

利用标准信号发生器(或便携式信号源)与频谱分析仪(或便携式接收机)在矿山的实地试验,研究了UHF波段无线信号在矿山的截止频率特性、电波传播衰减特性、弯曲巷道传播特性和煤掩穿透特性,得到了433,915MHz和2.4GHz无线射频信号矿山传输特性和煤掩穿透特性的定量数据。根据试验研究得到如下结论:无线电波在矿山传播必须大于矿山截止频率,截止频率在甚高频(VHF)频带50MHz左右;在平直巷道中,频率越高越有利于电磁波的传播;在弯曲巷道中,频率越高越不利于电磁波的传播;频率升高,射频信号的绕射性能、穿透性能降低。上述结论可对我国矿山无线移动通信技术提供试验数据和理论支持。

Experiment on characteristic of radio propagation in mine

How to advance the transmission distance for the radio wave is a momentous problem concerned by researchers.This paper conducted an experiment at coal mine making use of the standard signal generator and spectrum analyzer.It gained the quantification data about the characteristic of transmission and penetrability at 433MHz,915MHz and 2.4GHz via studying on the characteristics of cut-off frequency,transmitted attenuation,transmitted in curve tunnel and penetrability at UHF wave band.The result indicated that the main radio frequency in coal mine must higher than cut-off frequency.In straight tunnel,on the understanding that the frequency is higher,the attenuation rate would be smaller,and the cut-off frequency would be about 50MHz.On the contract,in curve tunnel,the higher frequency would cut down the ratio of electromagnetic wave,and the higher frequency would also go with reducing about the ability of diffracting and penetrating.The above conclusions can support experimental data and theory on the mobile communication technology in mine.