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Position ties between legacy VLBI antennas and VGOS antennas by using phase delays

Authors
/persons/resource/mhxu

Xu,  M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Savolainen,  Tuomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bolotin,  Sergei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bernhart,  Simone
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Plötz,  Christian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Haas,  Rüdiger
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Varenius,  Eskil
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Guangli
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

McCallum,  Jamie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/rob

Heinkelmann,  R.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/slunz

Lunz,  Susanne
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schuh

Schuh,  H.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zubko,  Nataliya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kareinen,  Niko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Xu, M., Savolainen, T., Bolotin, S., Bernhart, S., Plötz, C., Haas, R., Varenius, E., Wang, G., McCallum, J., Heinkelmann, R., Lunz, S., Schuh, H., Zubko, N., Kareinen, N. (2023): Position ties between legacy VLBI antennas and VGOS antennas by using phase delays, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3023


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020598
Abstract
The next-generation VLBI system, known as the VLBI Global Observing System (VGOS), is currently being deployed worldwide to replace the legacy S/X VLBI system. The latter has been operating for geodesy and astrometry during the last four decades and meanwhile suffers from aging instrumentation, thus needing replacement by VGOS. For a consistent continuation of the International Terrestrial Reference Frame (ITRF) in the VGOS era, the new VGOS antennas need to be tied to the legacy S/X VLBI antennas as accurately as possible. In this contribution we report the results of such position ties at eight geodetic sites with co-located legacy S/X VLBI and VGOS instrumentation, using phase delays that are extracted from global geodetic VLBI observations. An analysis of phase delay observables at X band from two antennas at the Geodetic Observatory Wettzell, Germany, extracted from 107 global 24-hour VLBI sessions since 2019 yields weighted root-mean-square scatters about the mean baseline vector of 0.3, 0.3, and 0.8 mm in the east, north, and up directions, respectively. We also investigate the systematic errors in these short baseline observations, which allows us to seperate the purely instrumental effects, affecting both short-baseline and long-baseline observables and dominating the estimates of the short-baseline vectors, from other contributions due to geophysical/astrophysical effects.