• Vienna Center for VLBI

    The Vienna Center for VLBI is a joint effort by TU Wien and Austria's Federal Office of Metrology and Surveying (BEV).

  • Geodetic Very Long Baseline Interferometry

    Very Long Baseline Interferometry (VLBI) is a microwave-based technique that evolved from radio astronomy in the early 1970s. Nowadays, VLBI is a major space-geodetic technique, indispensable for geodesy.

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  • Unique Geodetic Products

    VLBI delivers unique geodetic products that play indispensable roles for science and society.

  • Where are we?

    VLBI uniquely contributes to the most precise and stable reference frames, which are fundamental for numerous applications - from navigation to global change monitoring.

  • Precise timing!

    VLBI is the only operational technique to determine the Universal Time UT1 that reflects the Earth's rotation behavior. Precisely knowing this parameter is essentiual for navigation systems, such as ESA's Galileo.

  • Extragalactic benchmarks

    Bright radio sources located at the edge of the universe - billions of light-years from Earth - serve as ultra-stable benchmarks that are observed by VLBI.


Scheduling: generating highly sophisticated VLBI observation schedules

Our new scheduling software VieSched++ smoothly connects observation planning with simulations to generate the best schedules for your specific purposes.

Scheduling Center

Correlation: Processing raw data records to derive delay observables

The VSC has the capacities to process vast amounts of raw observation data. The derived quantities are the basis for geodetic parameter estimation.

Correlation Center

Analysis: Estimation of geodetic products

Using our in-house software suite VieVS for the analysis of VLBI sessions gives us great flexibility at estimating high quality geodetic parameters.

Analysis Center

Latest News

Excursion to the Geodetic Observatory Wettzell

Excursion to the Geodetic Observatory Wettzell

On June 13, the excursion to the Geodetic Observatory Wettzell organised by the Vienna VLBI Group took place. Students and…

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Paper on Cross-Polarization Gain Calibration of Linearly Polarized VLBI Antennas published

Paper on Cross-Polarization Gain Calibration of Linearly Polarized VLBI Antennas published

The new-generation geodetic radio telescopes observe two orthogonal linear polarization directions. Calibration of the gain differences between the two polarizers…

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Vienna VLBI Group at EGU 2024

Vienna VLBI Group at EGU 2024

The General Assembly 2024 of the European Geosciences Union (EGU) took place in Vienna from April 14th to 19th. The…

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Team Members

Hana Krásná

Assistant Professor

Johannes Böhm


Sigrid Böhm

Senior Scientist

Frédéric Jaron

Postdoc Researcher

Axel Nothnagel


Lisa Kern

University Assistant

Helene Wolf


David Mayer


Jakob Gruber


Olivia Panzenböck

Student Assistant

Leo Baldreich

Student Assistant

Peter Urban

Student Assistant

Sofie Steinmetz

Student assistant