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IVS contribution to ITRF2014

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Abstract

Every few years the International Terrestrial Reference System (ITRS) Center of the International Earth Rotation and Reference Systems Service (IERS) decides to generate a new version of the International Terrestrial Reference Frame (ITRF). For the upcoming ITRF2014 the official contribution of the International VLBI Service for Geodesy and Astrometry (IVS) comprises 5796 combined sessions in SINEX file format from 1979.6 to 2015.0 containing 158 stations, overall. Nine AC contributions were included in the combination process, using five different software packages. Station coordinate time series of the combined solution show an overall repeatability of 3.3 mm for the north, 4.3 mm for the east and 7.5 mm for the height component over all stations. The minimum repeatabilities are 1.5 mm for north, 2.1 mm for east and 2.9 mm for height. One of the important differences between the IVS contribution to the ITRF2014 and the routine IVS combination is the omission of the correction for non-tidal atmospheric pressure loading (NTAL). Comparisons between the amplitudes of the annual signals derived by the VLBI observations and the annual signals from an NTAL model show that for some stations, NTAL has a high impact on station height variation. For other stations, the effect of NTAL is low. Occasionally other loading effects have a higher influence (e.g. continental water storage loading). External comparisons of the scale parameter between the VTRF2014 (a TRF based on combined VLBI solutions), DTRF2008 (DGFI-TUM realization of ITRS) and ITRF2008 revealed a significant difference in the scale. A scale difference of 0.11 ppb (i.e. 0.7 mm on the Earth’s surface) has been detected between the VTRF2014 and the DTRF2008, and a scale difference of 0.44 ppb (i.e. 2.8 mm on the Earth’s surface) between the VTRF2014 and ITRF2008. Internal comparisons between the EOP of the combined solution and the individual solutions from the AC contributions show a WRMS in X- and Y-Pole between 40 and 100 \(\upmu \)as and for dUT1 between 5 and 15 \(\upmu \)s. External comparisons with respect to the IERS-08-C04 series show a WRMS of 132 and 143 \(\upmu \)as for X- and Y-Pole, respectively, and 13 \(\upmu \)s for dUT.

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Notes

  1. IERS Message No. 225 in http://www.iers.org/Messages.

  2. ftp://ivs.bkg.bund.de/pub/vlbi/ITRF2014/daily_sinex/ivs2014a/.

  3. ftp://ivsopar.obspm.fr/vlbi/ITRF2014/daily_sinex/ivs2014a/.

  4. ftp://cddis.gsfc.nasa.gov/pub/vlbi/ITRF2014/daily_sinex/ivs2014a/.

  5. ftp://ivs.bkg.bund.de/pub/vlbi/ivscontrol/.

  6. http://www.iers.org/sinex.

  7. http://lupus.gsfc.nasa.gov/files_IVS-AC/ITRF2013_checklist_v2014Feb07.pdf.

  8. ftp://ivs.bkg.bund.de/pub/vlbi/ITRF2014/daily_sinex/ivs2014a/.

  9. http://vlbi.geo.tuwien.ac.at/.

  10. http://lacerta.gsfc.nasa.gov/mk5/help/dbngs_format.txt.

  11. http://ccivs.bkg.bund.de/.

  12. Description and models: http://ggosatm.hg.tuwien.ac.at/loading.html.

  13. http://ccivs.bkg.bund.de/.

  14. http://itrf.ign.fr/ITRF_solutions/2014/.

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Acknowledgments

The VLBI intra-technique combination is the last link of a process chain starting with the planning and realization of the VLBI observations. We want to thank everyone who contributes to this process, especially the IVS Analysis Centers who provided the input data for the combination process. Furthermore, we want to thank the responsible persons at the IERS ITRS Combination Centers at DGFI-TUM, IGN, and JPL who provided valuable remarks on the combined sessions. The support by the DFG research unit FOR 1503 for the studies on atmospheric loading is acknowledged, too. Finally, we want to thank R. Bertelmann, R. Heinkelmann and A. Nothnagel for the work on introducing the data DOI for the VTRF, to pay tribute to all contributors and to provide a reference for the wealth of VLBI data used in the VTRF combination.

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  1. Ole Roggenbuck

    Present address: Institute of Metrology and Analysis Technique, Jade Hochschule Wilhelmshaven/Oldenburg/Elsfleth, Friedrich-Paffrath-Str. 101, 26389, Wilhelmshaven, Germany

Authors and Affiliations

  1. Federal Agency for Cartography and Geodesy, Richard-Strauss-Allee 11, 60598, Frankfurt am Main, Germany

    Sabine Bachmann, Daniela Thaller, Ole Roggenbuck & Linda Messerschmitt

  2. Faculty of Architecture, Civil Engineering and Geomatics, Laboratory for Industrial Metrology, Frankfurt University of Applied Sciences, Nibelungenplatz 1, 60318, Frankfurt am Main, Germany

    Michael Lösler

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  1. Sabine Bachmann
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Correspondence to Sabine Bachmann.

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Bachmann, S., Thaller, D., Roggenbuck, O. et al. IVS contribution to ITRF2014. J Geod 90, 631–654 (2016). https://doi.org/10.1007/s00190-016-0899-4

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