南京地区基于E频段毫米波链路的降雨监测研究

Research on Rainfall Monitoring Based on E-band Millimeter Wave Link in Nanjing Area

近年来,利用微波链路监测降雨这项新技术越来越受关注,准确的降雨观测数据对气候监测至关重要。该研究利用在南京地区搭建的E频段毫米波链路反演降雨强度信息,对降雨引起的衰减进行分离并实时确定参考基线,基于雨滴尺寸分布计算降雨强度,校正了湿天线效应的影响。实验结果表明,基于E频段链路反演获得的降雨强度在71GHz频段的相关系数约达到0.90,均方误差约为0.11mm/h,在81GHz频段约达到0.91,均方误差约为0.15mm/h。通过与激光雨滴谱仪的实测降雨强度作比较,验证了E频段毫米波链路监测降雨的可靠性。

In recent years,the new technology of monitoring rainfall using microwave links has attracted more and more atten⁃tion,and accurate rainfall observation data is crucial for climate monitoring.This study uses the E-band millimeter-wave link built in Nanjing to retrieve the rainfall intensity information,separates the attenuation caused by rainfall and determines the reference baseline in real time,calculates the rainfall intensity based on the size distribution of raindrops,and corrects the influence of the wet antenna effect.The experimental results show that the correlation coefficient of the rainfall intensity obtained based on the E-band link inversion in the 71 GHz frequency band is about 0.90,the mean square error is about 0.11 mm/h,and the 81 GHz fre⁃quency band is about 0.91,and the mean square error is about 0.15 mm/h.The reliability of the E-band millimeter-wave link in monitoring rainfall is verified by comparing it with the measured rainfall intensity of the laser raindrop spectrometer.