A hight-accuracy method for tropospheric zenith delay error correction by fusing atmospheric numerical models

• Main Authors: MAO Jian, CUI Tiejun, LI Xiaoli, CHEN Li, SUN Yanling, GAO Shuang, ZHANG Hui
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2019-07-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: tropospheric zenith delay; atmospheric numerical model; high spatiotemporal resolution; high-precision
• Online Access: http://html.rhhz.net/CHXB/html/2019-7-862.htm
• ISSN: 1001-1595; 1001-1595

The complexity and intensity of water vapor variations are the fundamental reasons why it is difficult for tropospheric zenith delay models to get accurate estimation. To solve this problem, a new method for estimating tropospheric zenith delay based on WRF(weather research and forecasting model) atmospheric numerical model is proposed. By analyzing the numerical simulation mechanism and data structure characteristics of WRF model, a hybrid method of direct integration and correction model is used to estimate the hourly tropospheric zenith delay at any position in the world. The validation results show that the accuracy of the hourly ZTD reanalysis value calculated by this method is 13.6 mm, and the daily average value is 9.3 mm, which is about 5 times and 3.5 times higher than that of the traditional model UNB3m and the current model GPT2w, respectively. In the 30-hour forecast period, the accuracy of the forecast value can also reach 22 mm. The accuracy is higher than existing tropospheric zenith delay models whether for the ZTD reanalysis value or the forecast value.