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Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis

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Abstract

In recent years, several studies have demonstrated the sensitivity of Global Navigation Satellite System (GNSS) station time series to displacements caused by atmospheric pressure loading (APL). Different methods to take the APL effect into account are used in these studies: applying the corrections from a geophysical model on weekly mean estimates of station coordinates, using observation-level corrections during data analysis, or solving for regression factors between the station displacement and the local pressure. The Center for Orbit Determination in Europe (CODE) is one of the global analysis centers of the International GNSS Service (IGS). The current quality of the IGS products urgently asks to consider this effect in the regular processing scheme. However, the resulting requirements for an APL model are demanding with respect to quality, latency, and—regarding the reprocessing activities—availability over a long time interval (at least from 1994 onward). The APL model of Petrov and Boy (J Geophys Res 109:B03405, 2004) is widely used within the VLBI community and is evaluated in this study with respect to these criteria. The reprocessing effort of CODE provides the basis for validating the APL model. The data set is used to solve for scaling factors for each station to evaluate the geophysical atmospheric non-tidal loading model. A consistent long-term validation of the model over 15 years, from 1994 to 2008, is thus possible. The time series of 15 years allows to study seasonal variations of the scaling factors using the dense GNSS tracking network of the IGS. By interpreting the scaling factors for the stations of the IGS network, the model by (2004) is shown to meet the expectations concerning the order of magnitude of the effect at individual stations within the uncertainty given by the GNSS data processing and within the limitations due to the model itself. The repeatability of station coordinates improves by 20% when applying the effect directly on the data analysis and by 10% when applying a post-processing correction to the resulting weekly coordinates compared with a solution without taking APL into account.

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Authors and Affiliations

  1. Astronomical Institute, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland

    Rolf Dach, Simon Lutz & Gerhard Beutler

  2. Institute of Geodesy and Geophysics, Vienna University of Technology, Gusshausstraße 27–29, 1040, Vienna, Austria

    Johannes Böhm

  3. Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Arcisstraße 21, 80333, Munich, Germany

    Peter Steigenberger

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  1. Rolf Dach
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  2. Johannes Böhm
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  3. Simon Lutz
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  4. Peter Steigenberger
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  5. Gerhard Beutler
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Correspondence to Rolf Dach.

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Dach, R., Böhm, J., Lutz, S. et al. Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis. J Geod 85, 75–91 (2011). https://doi.org/10.1007/s00190-010-0417-z

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