基于Galileo HAS服务的全球PWV反演验证分析  

Assessment of Global PWV Inversion with Galileo HAS Service

作　　者：王敏[1,2] 吕懋鑫 周英东 马洪磊 刘昊罡 WANG Min;LYU Maoxin;ZHOU Yingdong;MA Honglei;LIU Haogang(Information Engineering University,Zhengzhou 450001,China;Key Laboratory of Smart Earth,Beijing 100094,China)

机构地区：[1]信息工程大学,河南郑州450001 [2]智慧地球重点实验室,北京100094

出　　处：《测绘科学技术学报》2024年第4期338-342,共5页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(42304043);智慧地球重点实验室基金项目(KF2023YB01-11)。

摘　　要：基于实时精密单点定位PPP的大气可降水量PWV反演技术近年来受到广泛研究,但目前该技术大多需利用网络通讯接收改正信息,这使其在通讯网络不能覆盖及因灾通讯受限地区的使用受到限制。2023年1月开通服务的Galileo系统高精度定位服务HAS(High Accuracy Service)为实现不依赖额外通讯手段的实时PWV反演提供了新手段。本文首先分析验证了Galileo系统HAS服务的卫星轨道和钟差改正信息精度,并将基于武汉大学IGS分析中心产品的PWV反演结果作为内部对比参考值、将基于ERA5数据及探空数据结果作为PWV结果对比的外部参考值,验证了基于HAS服务的PWV反演精度。结果表明HAS服务反演得到的PWV与两类参考值均具有较高的一致性。其中HAS服务计算得出的结果与IGS事后产品PWV解算结果的两序列差的RMS为2.91 mm,与探空数据的序列差的RMS为2.51 mm。初步验证了HAS可用于降雨的短时预报可行性。The technology of precipitable water vapor(PWV)inversion based on real-time precise point positioning has received wide research attention in recent years.However,most of these technologies currently rely on network communication to receive GNSS observation correction,which limits their usage in areas where communication networks are unavailable or restricted due to disasters.The high accuracy service(HAS)of the Galileo,which began operating in January 2023,provides an alternative method to realize real-time PWV inversion without additional communication instruments.In this research,the accuracy of the satellite orbit and clock correction broadcast by Galileo HAS is first assessed,then the accuracy of PWV inversion based on HAS service is assessed with PWV inversion results retrieved with the orbit and clock product of Wuhan University(WHU)analysis center as an internal reference and PWV results retrieved with ERA5 data and radiosonde as external reference.It is demonstrated that the PWV obtained by HAS service is highly consistent with external and internal reference values.The root mean square(RMS)of the difference between PWV inversion with HAS and the WHU post-product is 2.91 mm.The RMS of the difference between the HAS results and sounding data is 2.51 mm.This preliminary assessment demonstrates the feasibility of using HAS for real-time PWV inversion and short-term rainfall forecasting.

关 键 词：精密单点定位 大气可降水量 伽利略系统 实时轨道钟差 高精度定位服务 

分 类 号：P228[天文地球—大地测量学与测量工程]