NEWS
9th International VLBI Technology Workshop 2024
The 9th International VLBI Technology Workshop was held from October 20 to 23, 2024 at MIT Haystack Observatory, Westford, MA, USA. The scope of this conference was hardware and software development related to VLBI technology. Frederic Jaron contributed three talks on the following topics:
– A Source Structure Correction Tool for VLBI Visibility Data
– Cross-polarization Gain Calibration of VGOS Antennas
– VGOS Phase Cal Performance at High Frequencies
This on-site conference brought together experts from both the astronomical and the geodetic application of VLBI, which led to very fruitful discussions.
TU Wien Joins Global Effort in Geodesy as a Partner of the United Nations Geodetic Centre of Excellence
The UN-GGCE Partnership Program launched in June 2024 to recognize the exceptional commitment and significant contributions Member States, universities, and organizations have made to the science of geodesy and strengthening the global geodesy supply chain. Since July 2024, TU Wien is recognized as a valued “Partner” of the UN-GGCE. This partnership acknowledges TU Wien’s expertise in Earth observations and representation, supporting global efforts in many scientific areas such as sustainable development. By joining this network, TU Wien strengthens its involvement in key international initiatives aimed at improving the precision and accessibility of geospatial data. This partnership marks a major step forward in raising awareness of the importance of geodesy and its role in shaping global geospatial infrastructure. More information can be found at the website of the UN-GGCE.
16th DiFX Users and Developers Meeting 2024
The 16th DiFX Users and Developers Meeting was held in Vienna from September 9 to 13, 2024. The first two days were devoted to the DiFX Users at the Federal Office of Metrology and Surveying (BEV) with many interesting presentations also from our Vienna VLBI group. The last three days were dedicated to the DiFX Developers who met at the TU Wien.
Further details and the photo shown here are both sourced from here.
European VLBI Network Symposium 2024
The 16th European VLBI Network (EVN) Symposium took place in Bonn from September 2nd to 6th, 2024. Frédéric Jaron presented a poster summarizing recent results from a project about the mitigation of source structure in geodetic VLBI.
The conference was an excellent opportunity for the discussion with leading experts in the field.
Excursion to the Geodetic Observatory Wettzell
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 is necessary to maximize the signal-to-noise ratio of observations. This study investigates these cross-polarization gain differences and their temporal evolution for selected antennas. Check it out!
Vienna VLBI Group at EGU 2024
- Benefits for the terrestrial reference frame with VLBI observations to Genesis (Johannes Böhm et al.)
- Atmospheric excitation of the annual wobble over the 21st-century from CMIP6 predictions under different scenarios (Sigrid Böhm et al.)
- Verifying the impact of additional breaks in station coordinates on VLBI scale drift (Lisa Kern et al.)
- Potential of VLBI observations to satellites to estimate orbital elements (Helene Wolf et al.)
Like every year, it was an enriching experience to engage with fellow researchers and exchange insights at this esteemed gathering. We look forward to next year!
Vienna VLBI Group at IVS General Meeting 2024
- Geodetic analysis of K band VLBI observations until 2024.0 (Hana Krásná et al.)
- Q band (43 GHz) celestial reference frame observed in 2021 (Hana Krásná et al.)
- Ambiguity Resolution in Legacy Sessions using Singleband Delays (Axel Nothnagel et al.)
- Optimal requirements for determining frame ties using VLBI observations to satellites (Wolf and Böhm)
- VieRDS for Simulating Source Structures at the Raw Data Level (Jakob Gruber et al.)
- Status Report and Aspirations: The Vienna Correlator in the VGOS Era (Jakob Gruber et al.)
The Vienna VLBI group also contributed to several other studies. For more information check out the program and the abstract book.
Paper on optimal distribution of VLBI transmitters on GALILEO satellites for frame ties published
A paper on the optimal distribution of VLBI transmitters in the Galileo space segment for frame ties (simulation study) has been published in Earth, Planets and Space. Check it out!
Paper on the importance of accurate a priori information for VLBI Intensive sessions published
A paper on the importance of accurate pole and station coordinates for the determination of UT1 with VLBI Intensive sessions (simulation study) has been published in the Journal of Geodesy. Check it out!