GAO Qing-quan,HAN Cong-cheng,XIAO Tian-gui.Feasibility Study of Microwave CommunicationLink for Rainfall Monitoring Purposes[J].Journal of Chengdu University of Information Technology,2018,(02):197-204.[doi:10.16836/j.cnki.jcuit.2018.02.015]
微波通信链路监测降水试验及可行性探究
- Title:
- Feasibility Study of Microwave CommunicationLink for Rainfall Monitoring Purposes
- 文章编号:
- 2096-1618(2018)02-0197-08
- Keywords:
- atmospheric science; atmospheric physics and atmospheric environment; rainfall measurement; millimeter wave signal; microwave link; microwave rain decay.
- 分类号:
- P412.13
- 文献标志码:
- A
- 摘要:
- 随着世界第四代通信网络的广泛覆盖,第五代无线通信技术已经开始研究。毫米波无线电频段将是5G通信网络研究的重要环节。利用微波信号传播的衰减信息来监测、反演降水作为传统方式的补充,从而提高传统降雨观测的准确度。从国际电联建议书(ITU-R)模型出发, 基于微波雨衰特性和雨滴谱统计资料建立了微波链路降雨有效衰减的模型和视距微波链路的降雨反演模型。设计并搭建不同频段视距模拟微波链路测雨实验系统, 利用降雨反演模型反演了路径平均降雨强度,并与雨滴谱仪数据进行了同步对比。观测结果表明,不同频段微波在不同降雨强度下,微波信号衰减显著。当降雨强度在0～12 mm/时,25 GHz频段微波链路降雨反演雨强相关系数约为0.7,偏差2.0 mm; 当降雨强度在0～14 mm/h时,23 GHz频段微波降雨衰减明显,微波链路反演降雨强度相关系数在约为0.6,偏差3.0 mm; 当降雨强度在0～11 mm/h时,38 GHz频段微波反演雨强相关系数约为0.6,偏差4.0 mm; 当降雨强度大于50 mm/h,反演偏差较大。此外,试图分析实验中偏差的原因,为下一次实验探索奠定基础。通过比较微波链路和雨滴光谱仪测得的雨强值,揭示这种降雨监测方法的准确性和可靠性。
- Abstract:
- With the widespread coverage of the fourth generation of communication networks in the world, the fifth generation of wireless communication technologies has been studied. Millimeter wave radio frequency band will be an important part of the research of 5 G communication network. Using attenuation information transmitted by microwave signals to monitor and retrieve precipitation as a supplement to traditional methods, the accuracy of traditional rainfall observations can be improved. Based on the ITU-R model, a model of effective attenuation of microwave link rainfall and a model of rainfall inversion of line-of-sight microwave link are established based on the statistics of rain attenuation and rain drop. We design and set up the experimental system of line-of-sight analog microwave link rain measurement with different frequency bands. The mean rainfall intensity of the microwave path is retrieved by the rainfall inversion model, then it is compared with the data of the rain drop spectrometer. The results show that microwave signals attenuate significantly under different rainfall intensities in different frequency bands. When the rainfall intensity is between0-12 mm/h, the correlation coefficient of rainfall intensity in the 25 GHz frequency band is about 0.7 and the deviation is 2.0 mm. When the rainfall intensity is between 0-14 mm/h, the microwave rainfall decays obviously in the frequency range of 23 GHz. The correlation coefficient of the rainfall intensity of the link inversion is about 0.6 and the deviation is 3.0 mm. When the rainfall intensity is 0-11 mm/h, the correlation coefficient of the rain intensity at 38 GHz is about 0.6, and the deviation is 4.0 mm. When the rainfall intensity is larger than 50 mm/h, rainfall intensity deviation is lager. Furthermore, we have tried to analyze the cause of the deviation in the experiment, and it will lay the foundation for the next experiment. By comparing the rain intensity value measured by our microwave link and a raindrop spectrometer, the accuracy and reliability of this rainfall monitoring method will be revealed.
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备注/Memo
收稿日期:2017-12-26基金项目:国家自然科学基金资助项目(41605122)