{"title":"通过中继器放大器和漏电传输线在地铁和矿井中进行无线电通信","authors":"R. A. Isberg","doi":"10.1109/VTC.1978.1622543","DOIUrl":null,"url":null,"abstract":"This paper is a report of the Author's visits to London Transport, the National Coal Board's Mining Research Establishment and the Cadley Hill Coal Mine where a \"daisy chain\" radio repeater and leaky feeder system is used for underground communication. A considerable amount of research and development of \"daisy chain\" radio repeater systems using leaky transmission lines has been accomplished in the United Kingdom by Dr. D. J. R. Martin of the National Coal Board's Mining and Research Establishment and Mr. Q. V. Davis of the University of Surrey. The basic \"daisy chain\" repeater system is similar in concept to coaxial cable telephone repeater and submarine communications cable systems which use amplifiers spaced at intervals to compensate for the attenuation of the cable. London Transport also has developed a prototype \"daisy chain\" radio repeater system which was commissioned into regular operation on a three mile section of the Bakerloo Underground railway in August, 1977. This system uses twenty-two 400 milliwatt repeater amplifiers spaced approximately 500 meters apart along leaky coaxial transmission lines which are supported from the walls of the subway tunnels and under the platforms of passenger stations. The other half of the Bakerloo Underground is equipped with three conventional twenty-five watt base stations feeding tee sections of leaky coaxial transmission line. While both systems perform satisfactorily, the section that is equipped with \"daisy chain\" amplifiers does not have transition zones between the tee sections of leaky cable, requires fewer telephone control lines and uses a simpler control system. By combining the techniques of the on-channel signal booster and the \"daisy chain\" repeater system using selective filters and wide band linear amplifiers it should be possible to extend signals received from base stations above ground into subways. This would satisfy the requirements for providing, at a much reduced cost, multi-channel radio communications for not only the transit system but also police, fire, para-medical and paging services.","PeriodicalId":264799,"journal":{"name":"28th IEEE Vehicular Technology Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1978-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":"{\"title\":\"Radio communication in subways and mines through repeater amplifiers and leaky transmission lines\",\"authors\":\"R. A. 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London Transport also has developed a prototype \\\"daisy chain\\\" radio repeater system which was commissioned into regular operation on a three mile section of the Bakerloo Underground railway in August, 1977. This system uses twenty-two 400 milliwatt repeater amplifiers spaced approximately 500 meters apart along leaky coaxial transmission lines which are supported from the walls of the subway tunnels and under the platforms of passenger stations. The other half of the Bakerloo Underground is equipped with three conventional twenty-five watt base stations feeding tee sections of leaky coaxial transmission line. While both systems perform satisfactorily, the section that is equipped with \\\"daisy chain\\\" amplifiers does not have transition zones between the tee sections of leaky cable, requires fewer telephone control lines and uses a simpler control system. By combining the techniques of the on-channel signal booster and the \\\"daisy chain\\\" repeater system using selective filters and wide band linear amplifiers it should be possible to extend signals received from base stations above ground into subways. 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引用次数: 10
摘要
本文是作者对伦敦交通局、国家煤炭委员会采矿研究机构和Cadley Hill煤矿的访问报告。Cadley Hill煤矿采用“菊花链”无线电中继器和漏电馈线系统进行地下通信。英国国家煤炭委员会采矿和研究机构的D. J. R. Martin博士和萨里大学的Q. V. Davis先生已经完成了大量使用泄漏传输线的“雏菊链”无线电中继器系统的研究和开发工作。基本的“菊花链”中继器系统在概念上类似于同轴电缆电话中继器和海底通信电缆系统,它们使用间隔间隔的放大器来补偿电缆的衰减。伦敦交通局还开发了一个“菊花链”无线电中继器系统的原型,该系统于1977年8月在贝克卢地下铁路的一段3英里长的路段投入正常运行。该系统使用22个400毫瓦的中继放大器,沿泄漏同轴传输线相距约500米,这些传输线由地铁隧道的墙壁和客运站的月台下支撑。Bakerloo地下的另一半配备了三个传统的25瓦基站,为三节泄漏的同轴传输线供电。虽然两种系统的性能都令人满意,但配备“菊花链”放大器的部分在泄漏电缆的三通段之间没有过渡区,需要更少的电话控制线路,并且使用更简单的控制系统。通过结合通道内信号增强器技术和使用选择性滤波器和宽带线性放大器的“菊花链”中继器系统,应该可以将从地面基站接收到的信号扩展到地铁。这将满足以低得多的费用不仅为运输系统而且为警察、消防、医疗辅助和寻呼服务提供多频道无线电通信的需要。
Radio communication in subways and mines through repeater amplifiers and leaky transmission lines
This paper is a report of the Author's visits to London Transport, the National Coal Board's Mining Research Establishment and the Cadley Hill Coal Mine where a "daisy chain" radio repeater and leaky feeder system is used for underground communication. A considerable amount of research and development of "daisy chain" radio repeater systems using leaky transmission lines has been accomplished in the United Kingdom by Dr. D. J. R. Martin of the National Coal Board's Mining and Research Establishment and Mr. Q. V. Davis of the University of Surrey. The basic "daisy chain" repeater system is similar in concept to coaxial cable telephone repeater and submarine communications cable systems which use amplifiers spaced at intervals to compensate for the attenuation of the cable. London Transport also has developed a prototype "daisy chain" radio repeater system which was commissioned into regular operation on a three mile section of the Bakerloo Underground railway in August, 1977. This system uses twenty-two 400 milliwatt repeater amplifiers spaced approximately 500 meters apart along leaky coaxial transmission lines which are supported from the walls of the subway tunnels and under the platforms of passenger stations. The other half of the Bakerloo Underground is equipped with three conventional twenty-five watt base stations feeding tee sections of leaky coaxial transmission line. While both systems perform satisfactorily, the section that is equipped with "daisy chain" amplifiers does not have transition zones between the tee sections of leaky cable, requires fewer telephone control lines and uses a simpler control system. By combining the techniques of the on-channel signal booster and the "daisy chain" repeater system using selective filters and wide band linear amplifiers it should be possible to extend signals received from base stations above ground into subways. This would satisfy the requirements for providing, at a much reduced cost, multi-channel radio communications for not only the transit system but also police, fire, para-medical and paging services.