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In-tunnel transmission characteristics of VICS radio beacon

机译:VICS无线电信标的隧道内传输特性

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The Radio Beacon System provides digital radio transmissions as part of the Vehicle Information and Communication System (VICS). Operating in the quasi-microwave (2.5 GHz) band at transmission speeds of 64 kbps, the system enables moving vehicles to be provided with roadway-traffic and location information. According to available reports on tests of this system, a service area of 70 m or more can be secured along open roadways where road station antennas are installed. Since the Metropolitan Expressway Public Corporation plans to construct a number of tunnels in the future, any practical Radio Beacon System will require that road stations also be located in tunnels. To confirm the possibility of communication in tunnels, the authors conducted an in-tunnel-evaluation test of the system to clarify in-tunnel transmission characteristics, which seem likely to be quite different from those on open roadways.
机译:无线电信标系统提供数字无线电传输,作为车辆信息和通信系统(VICS)的一部分。该系统在准微波(2.5 GHz)频段内以64 kbps的传输速度运行,可为行驶中的车辆提供道路交通和位置信息。根据有关该系统测试的可用报告,可以在安装了路站天线的空旷道路上确保70 m或更长的服务区域。由于大都会高速公路公共公司计划在将来建造许多隧道,因此,任何实用的无线电信标系统都将要求在隧道中也安装公路车站。为了确认在隧道中进行通讯的可能性,作者对系统进行了隧道内评估测试,以弄清隧道内的传输特性,这似乎与在开放道路上的传输特性完全不同。

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