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A novel approach for the direct estimation of the instantaneous Earth rotation velocity

Created 16/10/2025

Updated 16/10/2025

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The Very Long Baseline Interferometry (VLBI) measures two standard observables: group delay and fringe frequency (delay rate). While the group delay is widely used for estimation of a large set of geodetic and astrometric parameters, the fringe frequency is almost entirely ignored due to some technical limitations. However, the fringe frequency could be used as a direct measure of the instantaneous Earth rotation vector which is not accessible with the group delay. Here we show that nowadays all three components of the instantaneous Earth rotation vector are estimated on daily basis with a formal error of 1 prad/s or 10−8 in relative units, or even better if a large international VLBI network is at work. Implementation of the fringe frequency to the routine analysis of the geodetic VLBI results will result in additional improvement of the Earth rotation velocity estimation. A direct comparison of the angular rotation velocity with the length of day (LOD) parameter is now possible to develop a more precise transformation between the two observable values.

Citation: Titov, O. (2025). A novel approach for the direct estimation of the instantaneous Earth rotation velocity. Astronomy & Astrophysics, 699, A155. https://doi.org/10.1051/0004-6361/202553928

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Field Value
Title A novel approach for the direct estimation of the instantaneous Earth rotation velocity
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/fef54acc-ad94-42a2-9053-9be74d5c80bf
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "A novel approach for the direct estimation of the instantaneous Earth rotation velocity". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/a-novel-approach-for-the-direct-estimation-of-the-instantaneous-earth-rotation-velocity