Abstract
Abstract Space geodetic techniques provide highly accurate methods for estimating bedrock stability at subcentimetre level. We utilize data derived from Satellite Laser Ranging (SLR), Very Long Baseline Interferometry (VLBI) and Global Positioning Systems (GPS) techniques, collocated at the Hartebeesthoek Radio Astronomy Observatory, to characterise local plate motion and compare the solutions from the three techniques. Data from the GNSS station were processed using the GAMIT/GLOBK (version 10.4) software, data from the SLR station (MOBLAS-6)were processed using the Satellite Laser Ranging Data Analysis Software (SDAS) and the VLBI data sets were processed using the Vienna VLBI Software (VieVS) software. Results show that there is a good agreement between horizontal and vertical velocity components with a maximum deviation of 1.7 mm/yr, 0.7 mm/yr and 1.3 mm/yr between the North, East and Up velocity components respectively for the different techniques. At HartRAO there is no significant trend in the vertical component and all the techniques used are consistent with the a-priori velocities when compared with each other. This information is crucial in monitoring the local motion variations since geodetic instruments require a very stable base to minimise measurement errors. These findings demonstrate that station coordinate time-series derived with different techniques and analysis strategies provide comparable results.
Highlights
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The U.S Department of Defense (DOD) originally designed the satellite-based navigation system for military purposes. It has a constellation of at least 24 satellites orbiting at about 20 000 km in altitude, with an orbital period of 24 hours, in six di erent planes, with approximately four or more satellites on each plane (Yu et al, 1997)
Summary
O.J. BoÜtabierlieferung der Abweichungen von Mensch und Comparison of site velocities derived from contents_1_Übergreifende Fragestellung zu Methode. Coclolnotenctsa_2tteo nd_StGudPienSun,dVÜbLerBliefIeruangnd SLR techniques at the Hartebeesthoek Radio Astronomy Observatory der Abweichungen 22 Wirkung der Ausgabe 34. Jörg Riecke Die Zukunft und Gegenwart bei Studien und (Comparison of site velocities)Überlieferung der Abweichungen unter Fragestellung der Ausgabe und Mensch und Natur der Abweichungen
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