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1.前言近年以来,为了列车的安全运行,采用列车无线通讯的例子正在增加,对于线路全长全部都在隧道内的地下铁等情况,因为利用空间波的无线传播是不可能的,因而一般使用沿着全线设置平行二线,以便利用感应场进行列车无线通讯。然而,对于地上运行的一般铁道,从经济性和设置场所考虑,利用UHF或VHF的空间波的无线方式是有利的,这种称为移动无线的方式一般很多地被使用。
1. Introduction In recent years, there has been an increase in the use of train wireless communications for the safe operation of trains. In the case of subways where the total length of the lines are all within the tunnels, since the use of space waves for radio propagation is impossible, Use the parallel second line along the entire line to make use of the induction field for train wireless communication. However, in the case of general railroads operating on the ground, it is advantageous from the point of view of economy and installation space to utilize the wireless mode of the space wave of UHF or VHF, which is generally used in many ways as mobile radio.