Global Reference Frame VLBI solution VIE2025 (SX+VG)

Context and methodology

Global reference frame solution from Very Long Baseline Interferometry based on IVS data at S/X-band and VGOS until 2026.0. Analyzed with VieVS software package. The methodology of the analysis follows description in Krásná et al. (2023).

Technical details

• DATA START: 1979-08-03T00:00:00
• DATA END: 2025-12-30T00:00:00 
• FREQUENCY BANDS: S/X, VGOS
• ANALYSIS CENTER: VIE (TU Wien, Austria) 
• CONTACT: Hana Krasna (hana.krasna@tuwien.ac.at) 
• SOFTWARE: VieVS v4.0 
• TECHNIQUE: VLBI 
• DATA ORIGIN: vgosDB databases from IVS data centers 

Data format

Plain ASCII files.

Files

• vie2025_sxvg_CRF.txt: Celestial Reference Frame, source positions are in the J2000 frame, but at the 2015.0 galactic aberration epoch with 5.8 uas/y GA amplitude
• vie2025_sxvg_TRF.txt: Terrestrial Reference Frame, globally adjusted station positions at reference epoch 2020.0 with linear velocity
• vie2025_sxvg_TRFr.txt: simplified format of the TRF (without formal errors, external TRF VieVS input format) which in addition includes mean position of the session-wise reduced telescopes
• vie2025_sxvg_EOP.eoxy.txt: Earth Orientation Parameters, reported is one offset per EOP per session. Earth rotation parameters are reported for 0 UT, celestial pole offsets for the middle of the session

Acknowledgements

The International VLBI Service for Geodesy and Astrometry and all its components are acknowledged for providing the S/X and VGOS data.