2011年1月5日 · We used ZTDs measured by 28 GPS stations of the Crustal Movement Observation Network of China (CMONOC) in 2004 to validate those derived from the ECMWF analysis, NCEP reanalysis, and forecast meteorological data.

2020年1月2日 · 模拟试验结果表明在同化探空、风廓线等常规资料基础上，增加质控GPS ZTD有效改善了初始场的水汽条件，使得低层水汽辐合更强，从而改进了台风外围雨带的预报。 并且通过循环同化能够改善初始环流场，进而改进了台风路径的预报使得台风主体降水的位置得到改善。 Typhoon "Lekima", the No.9 typhoon in 2019, landed in Zhejiang and caused huge disasters in the eastern part of China.

Abstract: Based on an observational data serial of ground-based GPS Zenith Total Delay (ZTD) in North China for 2013 and 2014, a quality control scheme for the ZTD observation is developed. The quality control scheme can check and mark out those data that make the statistic characteristic of the data serial to deviate from Gaussion distribution ...

2024年12月24日 · Utilizing real-time precise point positioning (PPP) technology is an effective approach for obtaining high-precision zenith tropospheric delay (ZTD). Without relying on the terrestrial internet, Galileo high accuracy service (HAS) can provide precise orbit and precise clock products for the world.

2007年5月8日 · In this paper the ZTD time series with a 2-hour resolution are derived from globally distributed 150 International GPS Service (IGS) stations (1994–2006), which are used to investigate the secular trend and seasonal variation of ZTD as well as its implications in climate.

2012年5月11日 · In this study, the zenith tropospheric delay (ZTD) observed from 49 Global Positioning System (GPS) sites distributed in Asian area is used to assess the effectiveness and accuracy of ZTD calculated with the data from the European Center for Medium-Range Weather Forecasts (ECMWF) and the United States National Centers for Environmental Predictio...

2023年11月22日 · The results show that the GPS-derived ZTD time series is more consistent and reliable than those derived from BDS-only, Galileo-only, and GLONASS-only solutions. The performance of the single-GNSS ZTD solution can be enhanced with better accuracy and stability by combining multi-GNSS observations.

2022年10月7日 · First, the zenith tropospheric delay (ZTD) is extracted in real time with high accuracy by combining the data of more than 500 GNSS stations in the Crustal Movement Observation Network of China (CMONOC) and national reference station network (NRSN); second, a grid model of the elevation normalization model (ENM) in …

2024年10月24日 · Zenith total delay (ZTD) is a significant error source in Global Navigation Satellite System (GNSS) operations. While empirical ZTD models are widely used, the accuracy of these models is relatively low. In contrast, real-time models typically rely on interpolation methods and encounter challenges when sparse GNSS stations are operating.

2001年1月1日 · In the context of the MAGIC project (Meteorological Applications of GPS Integrated Column Water Vapor Measurements in the Western Mediterranean), zenith tropospheric delays (ZTD) are computed from Global Positioning System (GPS) signals at permanent sites in the western Mediterranean area continuously since November 1998.