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The VLBI Correlator Ambiguity and the Relativistic Group Delay Model

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Created 20/01/2025

Updated 20/01/2025

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The conventional VLBI relativistic delay model refers to the time epoch when the signal passes one of two stations of an interferometer baseline. Before, 2002, this model was used as part of the correlation procedure. Since 2002, a new correlation procedure has been adopted in which the VLBI group delays refers to the time epoch of signal passage at the geocenter. A new alternative to the conventional VLBI model delay should be introduced to follow that change because the discrepancy between the two relativistic geometrical delay models is up to 6 ps for ground-based VLBI experiments. In addition, a miscalculation of the signal arrival moment to the geocentre or the "reference station" may cause a larger modelling error (up to 50 ps) which would directly affect the radio telescope positions with a corresponding formal error of 15 mm. This is particularly essential for upcoming geodetic VLBI observations as the final goal of 1-mm accuracy needs to be achieved.

Presented at the Journées 2023: Temps et Relativité Générale (Time and General Relativity)

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Title The VLBI Correlator Ambiguity and the Relativistic Group Delay Model
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/ba66b0ca-49c9-4a02-8742-ab788a28b2e8
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 21/10/2024
Geospatial Coverage {"type": "Polygon", "coordinates": [[[112.92, -54.75], [159.11, -54.75], [159.11, -9.2402], [112.92, -9.2402], [112.92, -54.75]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "The VLBI Correlator Ambiguity and the Relativistic Group Delay Model". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/the-vlbi-correlator-ambiguity-and-the-relativistic-group-delay-model

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