VGOS CRF: Celestial Reference Frame from VGOS until Dec 2024

We present a celestial reference frame (CRF) from Very Long Baseline Interferometry (VLBI) Global Observing System (VGOS) including data until December 2024. The VGOS CRF is built with 1.8 million group delays observed in 193 multi-baseline 24-hour sessions (178 VGOS-OPS, 15 VGOS-R&D) with a fixed frequency distribution. It includes 418 radio sources, where 271 sources were observed in VGOS-OPS and 459 sources in VGOS-R&D. We show that VGOS-R&D scheduled with the source-centric method are beneficial for generating the VGOS CRF and at the same time they have been proven to provide high quality geodetic parameters. Comparison with ICRF3-SX reveals that 21% sources have normalized angular separation higher than 5 times the formal error. The VIE2024-VG CRF solution has excellent formal source position precision: median formal precision is 25 microas in right ascension and 41 microas in declination.

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Publication Details

Journal
Open MIND
Published
2025-04-08
DOI
https://doi.org/10.5281/zenodo.15237287
Primary Topic
GNSS positioning and interference
Type
article
Field-Weighted Citation Impact
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article

VGOS CRF: Celestial Reference Frame from VGOS until Dec 2024

Open MIND
GNSS positioning and interference
article

VGOS CRF: Celestial Reference Frame from VGOS until Dec 2024

article en

Abstract

We present a celestial reference frame (CRF) from Very Long Baseline Interferometry (VLBI) Global Observing System (VGOS) including data until December 2024. The VGOS CRF is built with 1.8 million group delays observed in 193 multi-baseline 24-hour sessions (178 VGOS-OPS, 15 VGOS-R&D) with a fixed frequency distribution. It includes 418 radio sources, where 271 sources were observed in VGOS-OPS and 459 sources in VGOS-R&D. We show that VGOS-R&D scheduled with the source-centric method are beneficial for generating the VGOS CRF and at the same time they have been proven to provide high quality geodetic parameters. Comparison with ICRF3-SX reveals that 21% sources have normalized angular separation higher than 5 times the formal error. The VIE2024-VG CRF solution has excellent formal source position precision: median formal precision is 25 microas in right ascension and 41 microas in declination.

Open MIND
Jet Propulsion Laboratory (US), TU Wien (AT), ETH Zurich (CH), Laboratoire d'Astrophysique de Bordeaux (FR)
Openalex Percentile: Top 46%
GNSS positioning and interference
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