Baseline Vector Repeatability at the Sub-Millimeter Level Enabled by Radio Interferometer Phase Delays of Intra-Site Baselines
Artikel i vetenskaplig tidskrift, 2023

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-hr 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 toward the goal of global geodesy at the 1 mm level.

VGOS

ITRF

GGOS

reference frames

phase delays

geodetic VLBI

Författare

Minghui Xu

Deutsches GeoForschungsZentrum (GFZ)

Aalto-Yliopisto

T. Savolainen

Aalto-Yliopisto

S. Bolotin

NASA Goddard Space Flight Center

Simone Bernhart

Reichert GmbH/Bundesamt für Kartographie und Geodäsie

C. Plötz

Federal Agency for Cartography and Geodesy

Rüdiger Haas

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Eskil Varenius

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Guangli Wang

Shanghai Astronomical Observatory

J. N. McCallum

University of Tasmania

R. Heinkelmann

Deutsches GeoForschungsZentrum (GFZ)

Susanne Lunz

Technische Universität Berlin

Harald Schuh

Deutsches GeoForschungsZentrum (GFZ)

Technische Universität Berlin

Nataliya Zubko

Finnish Geospatial Research Institute (FGI)

Niko Petteri Kareinen

Finnish Geospatial Research Institute (FGI)

Journal of Geophysical Research: Solid Earth

21699313 (ISSN) 21699356 (eISSN)

Vol. 128 3 e2022JB025198

Ämneskategorier

Telekommunikation

Annan fysik

Signalbehandling

DOI

10.1029/2022JB025198

Mer information

Senast uppdaterat

2023-10-23