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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 12
Atmos. Meas. Tech., 9, 5965–5973, 2016
https://doi.org/10.5194/amt-9-5965-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Advanced Global Navigation Satellite Systems tropospheric...

Atmos. Meas. Tech., 9, 5965–5973, 2016
https://doi.org/10.5194/amt-9-5965-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 13 Dec 2016

Research article | 13 Dec 2016

Tropospheric delay parameters from numerical weather models for multi-GNSS precise positioning

Cuixian Lu1, Florian Zus1, Maorong Ge1, Robert Heinkelmann1, Galina Dick1, Jens Wickert1,2, and Harald Schuh1,2 Cuixian Lu et al.
  • 1German Research Centre for Geosciences GFZ, Telegrafenberg, 14473 Potsdam, Germany
  • 2Technische Universität Berlin, Institute of Geodesy and Geoinformation Science, 10623 Berlin, Germany

Abstract. The recent dramatic development of multi-GNSS (Global Navigation Satellite System) constellations brings great opportunities and potential for more enhanced precise positioning, navigation, timing, and other applications. Significant improvement on positioning accuracy, reliability, as well as convergence time with the multi-GNSS fusion can be observed in comparison with the single-system processing like GPS (Global Positioning System). In this study, we develop a numerical weather model (NWM)-constrained precise point positioning (PPP) processing system to improve the multi-GNSS precise positioning. Tropospheric delay parameters which are derived from the European Centre for Medium-Range Weather Forecasts (ECMWF) analysis are applied to the multi-GNSS PPP, a combination of four systems: GPS, GLONASS, Galileo, and BeiDou. Observations from stations of the IGS (International GNSS Service) Multi-GNSS Experiments (MGEX) network are processed, with both the standard multi-GNSS PPP and the developed NWM-constrained multi-GNSS PPP processing. The high quality and accuracy of the tropospheric delay parameters derived from ECMWF are demonstrated through comparison and validation with the IGS final tropospheric delay products. Compared to the standard PPP solution, the convergence time is shortened by 20.0, 32.0, and 25.0 % for the north, east, and vertical components, respectively, with the NWM-constrained PPP solution. The positioning accuracy also benefits from the NWM-constrained PPP solution, which was improved by 2.5, 12.1, and 18.7 % for the north, east, and vertical components, respectively.

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The recent dramatic development of multi-GNSS constellations brings great opportunities and potential for more enhanced precise positioning, navigation, timing, and other applications. In this contribution, we develop a numerical weather model (NWM) constrained PPP processing system to improve the multi-GNSS precise positioning. Compared to the standard PPP solution, significant improvements of both convergence time and positioning accuracy are achieved with the NWM-constrained PPP solution.
The recent dramatic development of multi-GNSS constellations brings great opportunities and...
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