Plans for VLBI and GPS monitoring network for geodesy and geodynamics in Canada |
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| Institution: | 1. Geophysics Division, Geological Survey of Canada, Canada;1. Geodetic Survey Division, Surveys and Mapping Branch, Department of Energy, Mines and Resources, Ottawa, Canada;7. Department of Earth and Atmospheric Science, York University, Downsview, Ontario, Canada;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;2. Shanghai Engineering Center for Microsatellites, Shanghai 201203, China;3. Satellite Navigation Laboratory, Beijing Institute of Tracking and Telecommunication Technology, Beijing, China;4. ShanghaiTech University, Shanghai 201203, China;5. Innovation Academy for Microsatellites of Chinese Academy of Sciences, Shanghai 201203,China;6. University of Chinese Academy of Sciences, Beijing 100094, China;1. School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture, Beijing 102616, China;2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;2. College of Marine Science and Technology, China University of Geoscience, Wuhan 430074, China;3. School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, China;4. School of Surveying and Geoinformation Engineering, East China University of Technology, Nanchang 330013, China |
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| Abstract: | A newtork of VLBI and GPS sites in Canada will provide a framework for precise geodetic and geodynamic observations to study continent-wide crustal deformations, post-glacial uplift and plate tectonics. The VLBI component will consist of three permanent stations with a −3000-km baseline located on the geologically stable Canadian Shield as the principal calibration line; it will facilitate continuous monitoring of the earth's rotational dynamics and by means of collocated GPS receivers will serve to maintain the accuracy and the long-term stability of GPS satellite orbit computations. A mobile VLBI system will be used to establish fiducial points with a spacing of about 1000-km to provide a reference for high-precision regional GPS surveys. The unique Canadian VLBI data acquisition and processing system features time-domain multiplexing, a wave-front clock and 24 Mb/sec data recording on standard video cassettes. High-precision differential GPS positions with uniform spacing of about 500-km will complement the VLBI network; these will be reoccupied at regular intervals to facilitate construction of a strain map of Canada. Absolute gravity observations will be carried out at most VLBI and GPS sites to provide additional constraints for geophysical interpretation.1 |
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