铁路专用移动通信场强测量检波方式研究
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摘要
在铁路专用移动通信网场强测量中,检波方式将决定场强测量结果的准确性.常用检波方式有正峰值检波、均值检波和有效值检波.铁路数字移动通信系统(GSM-R)场强测量标准采用正峰值检波,而在实际运营中,场强测量的结果与通信系统实际应用效果存在一定差异,进而影响了通信系统的实际性能.本文主要研究了场强测量接收机及不同检波器的工作机理,根据数学描述建立了不同检波方式的模型,设计了实验室静态环境和现场动态环境下验证不同检波方式的测量方法,并进行了测量,对不同检波方式测量的数据进行对比分析.分析结果表明,有效值检波更适合GSM-R场强测量.
In the field strength measurement of railway dedicate mobile communication network, the selection of detection mode determines accuracy of measurement results. The detectors available are the max peak, the average and the RMS detector. The max peak detection is applied in the standards of railway digital mobile communication system(GSM- R) field strength measurement. This paper investigates the difference between the field measurement results and practical application effect of communication system in railway operation which affects the actual performance of the communication system. We mainly study the working mechanism of field strength measurement receiver and different detector, and propose the detection model according to the mathematical description. Then the field strength measurement methodology for the verification of different detection is designed in the laboratory static scenario and railway field dynamic scenario. At last the measurements are carried out and the data of different detection modes are compared and analyzed. The analysis result shows that the RMS detection is more suitable for GSM- R field strength measurement.
In the field strength measurement of railway dedicate mobile communication network, the selection of detection mode determines accuracy of measurement results. The detectors available are the max peak, the average and the RMS detector. The max peak detection is applied in the standards of railway digital mobile communication system(GSM- R) field strength measurement. This paper investigates the difference between the field measurement results and practical application effect of communication system in railway operation which affects the actual performance of the communication system. We mainly study the working mechanism of field strength measurement receiver and different detector, and propose the detection model according to the mathematical description. Then the field strength measurement methodology for the verification of different detection is designed in the laboratory static scenario and railway field dynamic scenario. At last the measurements are carried out and the data of different detection modes are compared and analyzed. The analysis result shows that the RMS detection is more suitable for GSM- R field strength measurement.
引文
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[2]He R S,Ai B,Zhong Z D,et al.Measurement-based stochastic model for high-speed railway channels[J].IEEE Intelligent Transportation Systems Magazine,2014(99):1-16.
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[4]陈旻,刘平.频谱分析仪检波方式的分析与研究[J].现代电子技术,2010(1):97-99.[CHEN M,LIU P.Analysis and research of the detector types of spectrum analyzer[J].Modern Electronics Technique,2010(1):97-99.]
[5]崔强,靳冬.均方根值-平均值检波器的实测对比与研究[J].安全与电磁兼容,2010(1):17-19.[CUI Q,JIN D.Comparison and analysis on the test results of RMS-average detector with others[J].Safety&Emc,2010(1):17-19.]
[6]Krug F,Russer P.Quasi-peak detector model for a timedomain measurement system[J].IEEE Transactions on Electromagnetic Compatibility,2005,47(2):320-326.
[7]Krug F,Braun S,Russer P.A novel quasi-peakdetector for time-domain EMI-measurements[J].Advances in Radio Science,2004(2):27-32.
[8]Medler Jens.Experience with the RMS-Average detector[C].2008 Asia-Pacific Symposium on Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility,2008.
[9]单秦,闻映红,李滟.高速铁路专用通信信道电波传播特性[J].中国铁道科学,2013,34(2):125-132.[SHANQ,WEN Y H,LI Y.Radio wave propagation characteristics of special communication channel for high-speed railway[J].China Railway Science,2013,34(2):125-132.]
[10]Guan K,Zhong Z D,Ai B.Propagation measurementsand modeling of crossing bridges on highspeed railway at 930 MHz[J].IEEE Trans Veh.Technol,2014,63(2):502-517.
[11]林木,张文垚,唐剑群.GSM-R无线网络覆盖和服务质量(Qo S)测试方法[S].铁道部科学技术司科技运[2008]170号,2008:1-32.[LIN M,ZHANG W Y,TANG J Q.Test specification of field strength and quality of service for GSM-R digital mobile communication network[S].Department of Science and Technology of the Ministry of Railway,KJY[2008]No.170,2008:1-32.]
[12]GSM-R Operators Group.System requirements specification version 15.4.0[S].EIRENE,2014.
[2]He R S,Ai B,Zhong Z D,et al.Measurement-based stochastic model for high-speed railway channels[J].IEEE Intelligent Transportation Systems Magazine,2014(99):1-16.
[3]黄大明,于虹.EMC测试中的峰值、准峰值、平均值、均方根值[J].杭州电子科技大学学报,2013,33(3):9-12.[HUANG D M,YU H.Peak,quasi-peak,average,RMS in EMC measurement[J].Journal of Hangzhou Dianzi University,2013,33(3):9-12.]
[4]陈旻,刘平.频谱分析仪检波方式的分析与研究[J].现代电子技术,2010(1):97-99.[CHEN M,LIU P.Analysis and research of the detector types of spectrum analyzer[J].Modern Electronics Technique,2010(1):97-99.]
[5]崔强,靳冬.均方根值-平均值检波器的实测对比与研究[J].安全与电磁兼容,2010(1):17-19.[CUI Q,JIN D.Comparison and analysis on the test results of RMS-average detector with others[J].Safety&Emc,2010(1):17-19.]
[6]Krug F,Russer P.Quasi-peak detector model for a timedomain measurement system[J].IEEE Transactions on Electromagnetic Compatibility,2005,47(2):320-326.
[7]Krug F,Braun S,Russer P.A novel quasi-peakdetector for time-domain EMI-measurements[J].Advances in Radio Science,2004(2):27-32.
[8]Medler Jens.Experience with the RMS-Average detector[C].2008 Asia-Pacific Symposium on Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility,2008.
[9]单秦,闻映红,李滟.高速铁路专用通信信道电波传播特性[J].中国铁道科学,2013,34(2):125-132.[SHANQ,WEN Y H,LI Y.Radio wave propagation characteristics of special communication channel for high-speed railway[J].China Railway Science,2013,34(2):125-132.]
[10]Guan K,Zhong Z D,Ai B.Propagation measurementsand modeling of crossing bridges on highspeed railway at 930 MHz[J].IEEE Trans Veh.Technol,2014,63(2):502-517.
[11]林木,张文垚,唐剑群.GSM-R无线网络覆盖和服务质量(Qo S)测试方法[S].铁道部科学技术司科技运[2008]170号,2008:1-32.[LIN M,ZHANG W Y,TANG J Q.Test specification of field strength and quality of service for GSM-R digital mobile communication network[S].Department of Science and Technology of the Ministry of Railway,KJY[2008]No.170,2008:1-32.]
[12]GSM-R Operators Group.System requirements specification version 15.4.0[S].EIRENE,2014.