Precision and accuracy of GPS-derived station displacements |
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| Affiliation: | 1. Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Arcisstraße 21, D-80333 München, Germany;2. Deutsches Geodätisches Forschungsinstitut, Alfons-Goppel-Straße 11, D-80539 München, Germany;3. Institut für Geodäsie und Geoinformation, Universität Bonn, Nussallee 17, D-53116 Bonn, Germany;4. OHB-System AG, Universitätsallee 27–29, D-28359 Bremen, Germany;5. Fachgebiet Satellitengeodäsie, Technische Universität München, Arcisstraße 21, D-80333 München, Germany;1. Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC, Canada H3C 1K3;2. IRSST, Montréal, QC, Canada H3A 3C2;3. Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada J1K 2R1;1. Helmholtz Centre Potsdam – GFZ German Research Centre for Geosciences, Section 1.3: Earth System Modelling, Germany;2. Charles University in Prague, Czech Republic;3. DIAS – Dublin Institute of Advanced Studies, Ireland;4. Utrecht University, The Netherlands;1. College of Earth Science and Engineering, Hohai University, Nanjing 211100, China;2. North China University of Water Resources and Electric Power, Zhengzhou 450045, China;1. GFZ German Research Centre for Geosciences, Department 1: Geodesy and Remote Sensing, Section 1.3: Earth System Modelling, Potsdam, Germany.;2. Freie Universitát Berlin, Institute of Meteorology, Berlin, Germany.;1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2. Key Laboratory of Advanced Transducers and Intelligent Control Systems (Ministry of Education and Shanxi Province), Taiyuan University of Technology, Taiyuan 030024, China;3. State Key Laboratory of Coal and CBM Co-mining, Jincheng 048000, China |
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| Abstract: | Space geodetic techniques like Global Navigation Satellite Systems (GNSS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI) provide valuable input for, e.g., studies of Global Isostatic Adjustment (GIA). This paper discusses the current precision and accuracy of GPS-derived vertical and horizontal station displacements. The precision is evaluated by repeatabilities and solutions computed from different subintervals of the data available. However, due to systematic effects, the precision is often much better than the accuracy. The accuracy is evaluated by comparisons of the space geodetic techniques amongst each other and comparisons with geophysical models for atmospherical and hydrological loading. Besides the analysis of time series, co-located GNSS, SLR, and VLBI sites allow for a comparison of velocities estimated in Terrestrial Reference Frame (TRF) solutions of the different techniques. |
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