Assessment of Global PWV Inversion with Galileo HAS Service
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 net-works 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 in-version results retrieved with the orbit and clock product of Wuhan University(WHU)analysis center as an inter-nal 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.
precise point positioning(PPP)precipitable water vapor(PWV)Galileo systemreal-time orbit and clockhigh accuracy service(HAS)
万方数据
维普
