摘要
为了克服传统电磁数值计算方法对大尺度射频空间场计算的局限性,以准确预测地铁隧道内无线通信信号的电场强度,评估隧道大尺度民用无线通信电磁环境的安全性,本研究首先利用COMSOL软件对隧道小尺度空间内不同制式(3G、4G、5G)的民用无线通信系统辐射终端(漏泄同轴电缆)发射的信号强度进行建模;其次,基于漏泄同轴电缆的辐射机理,对隧道小尺度空间的仿真结果进行理论计算,推导了隧道大尺度空间内不同民用通信频段对应的信号强度,并将隧道内信号接收功率的计算结果与实地测量结果进行对比,两者均方根误差不超过1.58 dBm,验证了本论文基于小尺度仿真结果推导隧道大尺度空间内不同民用通信频率信号强度模型的有效性;再次,利用外推法根据已得到信号强度结果,计算出地铁隧道大尺度空间内3G、4G、5G民用通信环境电场强度的最大值分别为0.143 V/m、0.098 V/m和0.204 V/m,将隧道内电场强度的计算结果与实地测量结果进行对比,计算值和测量值的均方根误差小于0.013 V/m,验证了提出的基于小尺度空间民用通信信号强度建模预测出的大尺度空间内民用通信电磁环境场强计算方法的可靠性,有效提高了隧道内大尺度空间电磁环境的计算效率;预测结果表明:地铁隧道内电磁环境功率密度预测的最大值仅为国际非电离辐射委员会(International commission on non-ionizing radiation protection,ICNIRP)公众暴露限值的0.005%,电场强度预测最大值仅为国家电磁环境控制限值(GB 8702―2014)的1.7%,证明了地铁隧道内民用无线通信电磁环境是安全的。
This study aimed to address the limitations of traditional electromagnetic numerical calculation methods in large-scale radio frequency(RF)space fields,accurately predict the electric field intensity of wireless communication signals in subway tunnels,and evaluate the safety of large-scale civil wireless communication electromagnetic environments in tunnels.To this end,COMSOL software was used to model the signal strength emitted by radiation terminals(leaky coaxial cables),which operate civil wireless communication systems of different types(3G,4G,5G)in small-scale space tunnels.Then,the simulation results for the small-scale space were theoretically calculated based on the radiation principle of a leaky coaxial cable.These results were used to derive the signal strengths corresponding to different civil communication frequency bands in the large-scale space of the tunnel.The prediction results of the signal received power in the tunnel were compared with the field measurement results:the root mean square error of the two was less than 1.58 dBm,thereby verifying the effectiveness of the signal strength model for different civil communication frequencies in a large-scale space tunnel.Subsequently,based on the calculated results of the signal strength,the extrapolation method was used to further calculate the maximum electric field intensities of 3G,4G,and 5G in the civil communication environment within the large-scale space of the subway tunnel―0.143 V/m,0.098 V/m,and 0.204 V/m,respectively.The calculated results of the electric field intensity were compared with the field measurement results in the tunnel:the root mean square error between the calculated and measured values was found to be less than 0.013 V/m.This result verifies the reliability of the proposed method for calculating the electromagnetic environment of civil communication in a large-scale space based on the signal strength modeling of a small-scale space.It further indicates that the proposed method effectively improves the calculation efficie
作者
周文颖
赵吉庆
ZHOU Wenying;ZHAO Jiqing(Key Laboratory of Opto-Electronic Technology and Intelligent Control Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
2024年第4期107-117,共11页
Journal of Radiation Research and Radiation Processing
基金
国家自然科学基金项目(62160017)资助。
关键词
地铁隧道
漏泄同轴电缆
大尺度空间
场强预测
Subway tunnel
Leaky coaxial cable
Large-scale space
Field strength prediction
