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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-93
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 10 Sep 2018

Regular paper | 10 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Sensitivity of GNSS tropospheric gradients to processing options

Michal Kačmařík1, Jan Douša2, Florian Zus3, Pavel Václavovic2, Kyriakos Balidakis3, Galina Dick3, and Jens Wickert3,4 Michal Kačmařík et al.
  • 1Department of Geoinformatics, VŠB – Technical University of Ostrava, Ostrava, Czech Republic
  • 2Geodetic Observatory Pecný, Research Institute of Geodesy, Topography and Cartography, Zdiby, Czech Republic
  • 3GFZ German Research Centre for Geosciences, Potsdam, Germany
  • 4Institute of Geodesy and Geoinformation Science, Technical University of Berlin, Germany

Abstract. An analysis of processing settings impact on estimated tropospheric gradients is presented. The study is based on the benchmark data set collected within the COST GNSS4SWEC action with observations from 430 GNSS reference stations in central Europe for May and June 2013. Tropospheric gradients were estimated in eight different variants of GNSS data processing using Precise Point Positioning with the G-Nut/Tefnut software. The impact of the gradient mapping function, elevation cut-off angle, GNSS constellation and real-time versus post-processing mode were assessed by comparing the variants by each to other and by evaluating them with respect to tropospheric gradients derived from two numerical weather prediction models. Generally, all the solutions in the post-processing mode provided a robust tropospheric gradient estimation with a clear relation to real weather conditions. The quality of tropospheric gradient estimates in real-time mode mainly depends on the actual quality of the real-time orbits and clocks. Best results were achieved using the 3° elevation angle cut-off and a combined GPS+GLONASS constellation. Systematic effects of up to 0.3mm were observed in estimated tropospheric gradients when using different gradient mapping functions which depend on the applied observation elevation-dependent weighting. While the latitudinal troposphere tilting causes a systematic difference in the north gradient component on a global scale, large local wet gradients pointing to a direction of increased humidity cause systematic differences in both gradient components depending on the gradient direction.

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