高速铁路专用通信信道电波传播特性  

Radio Wave Propagation Characteristics of Special Communication Channel for High-Speed Railway

作　　者：单秦[1,2] 闻映红[1,2] 李滟[3] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京交通大学电磁兼容实验室,北京100044 [3]中国家用电器研究院,北京100053

出　　处：《中国铁道科学》2013年第2期125-132,共8页China Railway Science

基　　金：国家自然科学基金资助项目(61172021);教育部长江学者和创新团队发展计划项目(IRT0949);中央高校基本科研业务费专项资金资助项目(2011JBZ001)

摘　　要：依据射线跟踪法和帐篷定律,计算高速列车车厢内高速铁路专用通信信道电波传播的频率响应可知,电波在车厢内传播的路径损耗大于30dB。实测车厢内电波传播的频率响应,对实测数据进行IFFT变换处理可知,在直达路径(LOS)和非直达路径(NLOS)条件下,电波传播的平均功率时延谱符合Saleh-Valenzuela(SV)模型,均方根时延扩展与传播距离的关系更适合选用幂函数描述。进一步对实测数据进行统计处理,得到SV模型关键参数,以及车厢内电波传播的小尺度衰落模型和路径损耗模型;车厢内电波传播的小尺度幅度衰落在LOS场景下服从对数正态分布,在NLOS场景下服从瑞利分布;车厢内电波传播环境指数LOS场景下为1.283,NLOS场景下为1.098。The frequency response of radio wave propagation of special communication channel for high-speed railway in high-speed train coach was calculated according to ray tracing method and tent law.From the calculation,we know that the path loss of radio wave propagation in train coach is greater than 30 dB.The frequency response of radio wave propagation in train coach was measured,and the measured data were processed by Inverse Fast Fourier Transform（IFFT）.It＇s known that the average power delay profile（PDP） of radio wave propagation accords with Saleh-Valenzuela（SV） model under the conditions of line-of-sight（LOS） and non-line-of-sight（NLOS）.Power function is more suitable to describe the relationship between RMS delay spread and propagation distance.The measured data were further treated statistically to obtain the key parameters of SV model as well as the small-scale fading model and path loss model of radio wave propagation in train coach.The small-scale fading of radio wave propagation in train coach obeys log-normal distribution under LOS condition and Rayleigh distribution under NLOS condition.The environmental index of radio wave propagation in train coach is 1.283 under LOS condition and 1.098 under NLOS condition.

关 键 词：电磁传播 专用通信信道 直达路径 频率响应 高速铁路 

分 类 号：U285.21[交通运输工程—交通信息工程及控制] TN011[交通运输工程—道路与铁道工程]