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Baseline vector repeatability at the sub‐millimeter level enabled by radio interferometer phase delays of intra‐site baselines

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Xu,  M.
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Savolainen,  Tuomas
External Organizations;

Bolotin,  Sergei
External Organizations;

Bernhart,  Simone
External Organizations;

Plötz,  Christian
External Organizations;

Haas,  Rüdiger
External Organizations;

Varenius,  Eskil
External Organizations;

Wang,  Guangli
External Organizations;

McCallum,  Jamie
External Organizations;

/persons/resource/rob

Heinkelmann,  R.
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/slunz

Lunz,  Susanne
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/schuh

Schuh,  H.
1.1 Space Geodetic Techniques, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zubko,  Nataliya
External Organizations;

Kareinen,  Niko
External Organizations;

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5015711.pdf
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Zitation

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): Baseline vector repeatability at the sub‐millimeter level enabled by radio interferometer phase delays of intra‐site baselines. - Journal of Geophysical Research: Solid Earth, 128, 3, e2022JB025198.
https://doi.org/10.1029/2022JB025198


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015711
Zusammenfassung
We report the results of position ties for short baselines at eight geodetic sites based on phase delays that are extracted from global geodetic very-long-baseline interferometry (VLBI) observations rather than dedicated short-baseline experiments. 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. Position ties are also obtained for other short baselines between legacy antennas and nearby, newly built antennas. They are critical for maintaining a consistent continuation of the realization of the terrestrial reference frame, especially when including the new VGOS network. The phase delays of the baseline WETTZ13N–WETTZELL enable an investigation of sources of error at the sub-millimeter level. We found that a systematic variation of larger than 1 mm can be introduced to the Up estimates of this baseline vector when atmospheric delays were estimated. Although the sub-millimeter repeatability has been achieved for the baseline vector WETTZ13N–WETTZELL, we conclude that long term monitoring should be conducted for more short baselines to assess the instrumental effects, in particular the systematic differences between phase delays and group delays, and to find common solutions for reducing them. This will be an important step towards the goal of global geodesy at the 1 mm level.