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.
global navigation satellite system (GNSS)zenith tropospheric delay (ZTD)precipitable water vapor (PWV)extreme rainstorm
NETL
NSTL
万方数据
