Comparison of site velocities derived from collocated GPS, VLBI and SLR techniques at the Hartebeesthoek Radio Astronomy Observatory (Comparison of site velocities)

dc.contributor.authorMunghemezulu, Cilence
dc.contributor.authorCombrinck, Ludwig
dc.contributor.authorMayer, D.
dc.contributor.authorBotai, Joel Ongego
dc.contributor.emailjoel.botai@up.ac.zaen_US
dc.date.accessioned2014-12-01T11:59:52Z
dc.date.available2014-12-01T11:59:52Z
dc.date.issued2014-04
dc.description.abstractSpace 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.en_US
dc.description.sponsorshipThe University of Pretoria, Vienna University of Technology, the National Research Foundation (NRF) of South Africa, Hart-RAO and Inkaba yeAfrica.en_US
dc.description.urihttp://www.degruyter.com/view/j/jogsen_US
dc.identifier.citationMunghemezulu, C, Combrinck, L, Mayer, D & Botai, OJ 2014, 'Comparison of site velocities derived from collocated GPS, VLBI and SLR techniques at the Hartebeesthoek Radio Astronomy Observatory (Comparison of site velocities)', Journal of Geodetic Science, vol. 4, no. 1, pp. 1-7.en_US
dc.identifier.issn2081-9943 (online)
dc.identifier.other10.2478/jogs-2014-0002
dc.identifier.urihttp://hdl.handle.net/2263/42728
dc.language.isoenen_US
dc.publisherDe Gruyter Openen_US
dc.rights© 2014 C. Munghemezulu et al., licensee De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.en_US
dc.subjectGlobal Positioning Systems (GPS)en_US
dc.subjectSite velocitiesen_US
dc.subjectSatellite Laser Ranging (SLR)en_US
dc.subjectVery Long Baseline Interferomtry (VLBI)en_US
dc.titleComparison of site velocities derived from collocated GPS, VLBI and SLR techniques at the Hartebeesthoek Radio Astronomy Observatory (Comparison of site velocities)en_US
dc.typeArticleen_US

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