利用多GNSS分析澳大利亚极端降雨水汽变化  

Variation analysis of water vapor during an extreme rainstorm in Australia using multi-GNSS

作　　者：刘怡兵 周凌昊 范磊 LIU Yibing;ZHOU Linghao;FAN Lei(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;School of Space and Environment,Beihang University,Beijing 100191,China;Key Laboratory of Navigation and Communication Fusion Technology,Ministry of Industry and Information Technology,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191 [2]北京航空航天大学空间与环境学院,北京100191 [3]卫星导航与移动通信融合技术工业与信息化部重点实验室,北京100191

出　　处：《导航定位学报》2024年第4期211-219,共9页Journal of Navigation and Positioning

基　　金：国家重点研发计划项目(2023YFB3907302);国家自然科学基金项目(41931075,41961144015)。

摘　　要：利用澳洲153个全球卫星导航系统(GNSS)站提供的北斗卫星导航系统(BDS)、全球定位系统(GPS)、伽利略卫星导航系统(Galileo)的多系统观测数据与武汉大学发布的超快速轨道和钟差产品/最终产品,计算2017年澳洲一次极端降雨过程中测站上空的天顶对流层延迟(ZTD)和大气可降水含量(PWV)。结果表明:多系统GNSS联合解算的ZTD与国际GNSS服务(IGS)最终产品互差的平均偏差为-0.01 mm,较单一GPS系统解算偏差更小;准实时ZTD计算与事后计算精度相当。利用气象再分析资料ERA5提供的温压数据进行PWV反演和精度验证的结果表明:多系统GNSS反演PWV与ERA5互差RMS为2.71 mm,符合气象学研究要求。最后,结合ERA5陆面产品的逐时降水量数据分析PWV与本次降雨的关联。在时序上,PWV达到极大值后2~3 h内降水量达到最大值。在空间上,PWV高值地区与强降雨地区具有高度一致性。In this study,the BeiDou navigation satellite system(BDS),global positioning system(GPS)and Galileo observation from 153 GNSS(global navigation satellite system)stations within Australia were processed.The zenith tropospheric delay(ZTD)and precipitable water vapor(PWV)data during an extreme rainstorm was obtained for each station.Referred by the International GNSS Services final products and the ultrarapid/final products from Wuhan University,results showed that ZTD from multi-GNSS observation attained the MB of-0.01 mm,which was closer to 0 than that from GPS-only solution.The accuracy of real-time ZTD calculation was equivalent to that of post-calculation.Afterwards,PWV was converted with the pressure and temperature data from ERA5 for each station.Accuracy analysis showed that the PWV attained the RMS of 2.71 mm with the reference of ERA5,which could meet the requirements of meteorological research.Finally,the relationships between PWV and precipitation were analyzed both spatially and temporally with the precipitation data from ERA5-land products.On one hand,the temporal analysis showed that the maximum precipitation appeared 2~3 h after PWV had reached its maximum value.On the other hand,the spatial analysis showed that the extreme precipitation tendcd to occur within the regions where the PWV also displayed high value.

关 键 词：全球卫星导航系统(GNSS) 天顶对流层延迟(ZTD) 大气可降水含量(PWV) 极端降雨 

分 类 号：P228[天文地球—大地测量学与测量工程]