Abstract
Global Navigation Satellite Systems (GNSS) allow a precise estimation of atmospheric water vapour what is successfully used in weather forecasting, namely in Numerical Weather Prediction (NWP) models. In this study the quality of real-time and post-processed zenith total delay (ZTD) values from GPS (Global Positioning System) Precise Point Positioning (PPP) technique processing is investigated. GPS observations from a month-long period and eight European stations were processed in RTKLIB program package. Two versions of real-time processing solutions using different real-time IGS (International Global Navigation Satellite Systems Service) products (IGS01, IGS03) and two versions of post-processed solutions using different strategies were evaluated. Obtained ZTDs were compared with the final IGS ZTD product. The mean RMSE (root-mean-square error) was 10.3 mm for real-time solution based on the IGS03 real-time product and 12.2 mm for the other solution based on the IGS01 product. Both post-processed solutions reached a mean RMSE of about 5 mm. The better real-time ZTD solution from RTKLIB using IGS03 product was therefore close to the 10 mm value defined as a target ZTD accuracy necessary for their usage in NWP models and nowcasting applications in meteorology.
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Acknowledgements
The author acknowledges the support from the Czech Ministry of Education, Youth and Sports (project no. LD14102). The study has been organized within the E.U. COST Action ES1206 (GNSS4SWEC) project.
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Kačmařík, M. (2018). Retrieving of GNSS Tropospheric Delays from RTKLIB in Real-Time and Post-processing Mode. In: Ivan, I., Horák, J., Inspektor, T. (eds) Dynamics in GIscience. GIS OSTRAVA 2017. Lecture Notes in Geoinformation and Cartography. Springer, Cham. https://doi.org/10.1007/978-3-319-61297-3_13
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