煤矿井下有限空间无线信道特性研究

Radio Channel Character Research in Limited Space of Coal Mine Rectangular Tunnels

为了研究煤矿井下无线电波在信道内的传播特性及影响,基于矩形隧道传播模型分析了不同极化方式下电磁波的衰减特性的近似解。在理论分析的基础上对一个模拟矩形矿井巷道内电磁波的衰减特性进行了仿真。根据结果可知,随着巷道距离的增加电磁波存在严重的快衰落现象。在近距离处场强的增幅很大,变化趋势很大,随着距离的增加,场强衰减变缓。这些结论为矿井无线救援通信技术提供了理论支持。

In order to research the effect to magnetic wave propagation character in limited space of coal mine rectangular tunnels, we analyzed the approxirnate solution of the electric magnetic attenuation character which polarized in different ways based on the rectangular tunnel transmission mode. We simulated the attenuation character in a simulated rectangular mine based on the theoretic analysis . According to the result, we can acquire the situation that with the distance of the mine tunnel increasing, the electromagnetic wave will have serious attenuation phenomenon. In the close distance, the amplitude of the electric intensity tends to be sharp and with increase in the distance, it tends to wane gently. The solution above provides a theoretic support to the wireless succor communication technique in mine.