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  • Geophysics  (4)
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  • 1
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    Estimation of Geodetic and Geodynamical Parameters with VieVS (2010)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: Since 2008 the VLBI group at the Institute of Geodesy and Geophysics at TU Vienna has focused on the development of a new VLBI data analysis software called VieVS (Vienna VLBI Software). One part of the program, currently under development, is a unit for parameter estimation in so-called global solutions, where the connection of the single sessions is done by stacking at the normal equation level. We can determine time independent geodynamical parameters such as Love and Shida numbers of the solid Earth tides. Apart from the estimation of the constant nominal values of Love and Shida numbers for the second degree of the tidal potential, it is possible to determine frequency dependent values in the diurnal band together with the resonance frequency of Free Core Nutation. In this paper we show first results obtained from the 24-hour IVS R1 and R4 sessions.
    Keywords: Geophysics
    Type: Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry; 202-206; NASA/CP-2010-215864
    Format: application/pdf
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  • 2
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    Design Aspects of the VLBI2010 System - Progress Report of the IVS VLBI2010 Committee (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This report summarizes the progress made in developing the next generation VLBI system, dubbed the VLBI2010 system. The VLBI2010 Committee of the International VLBI Service for Geodesy and Astrometry (IVS) worked on the design aspects of the new system. The report covers Monte Carlo simulations showing the impact of the new operating modes on the final products. A section on system considerations describes the implications for the VLBI2010 system parameters by considering the new modes and system-related issues such as sensitivity, antenna slew rate, delay measurement error. RF1, frequency requirements, antenna deformation, and source structure corrections_ This is followed by a description of all major subsystems and recommendations for the network, station. and antenna. Then aspects of the feed, polarization processing. calibration, digital back end, and correlator subsystems are covered. A section is dedicated to the NASA. proof-of-concept demonstration. Finally, sections tm operational considerations, on risks and fallback options, and on the next steps complete the report.
    Keywords: Geophysics
    Type: NASA/TM-2009-214180 , 200901964
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  • 3
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    GFZ Analysis Center (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This report briefly provides general information and a component description of the recently established IVS Analysis Center at GFZ and outlines the planned activities.
    Keywords: Geophysics
    Type: International VLBI Service for Geodesy and Astrometry 2012 Annual Report; 255-256; NASA/TP-2013-217511
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  • 4
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    Prospects for UT1 Measurements from VLBI Intensive Sessions (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Very Long Baseline Interferometry (VLBI) Intensives are one-hour single baseline sessions to provide Universal Time (UT1) in near real-time up to a delay of three days if a site is not e-transferring the observational data. Due to the importance of UT1 estimates for the prediction of Earth orientation parameters, as well as any kind of navigation on Earth or in space, there is not only the need to improve the timeliness of the results but also their accuracy. We identify the asymmetry of the tropospheric delays as the major error source, and we provide two strategies to improve the results, in particular of those Intensives which include the station Tsukuba in Japan with its large tropospheric variation. We find an improvement when (1) using ray-traced delays from a numerical weather model, and (2) when estimating tropospheric gradients within the analysis of Intensive sessions. The improvement is shown in terms of reduction of rms of length-of-day estimates w.r.t. those derived from Global Positioning System observations
    Keywords: Geophysics
    Type: Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry; 251-255; NASA/CP-2010-215864
    Format: application/pdf
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