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Rüdiger Haas
Type of contribution: oral

GLONASS-VLBI: Onsala-Wettzell test observations

Rüdiger Haas (1), Thomas Hobiger (1), Andreas Hellerschmied (2), Alexander Neidhardt (3), Jan Kodet (3), (1) Chalmers University of Technology, Earth and Space Sciences, Space Geodesy and Geodynamics, Onsala, Sweden (rudiger.haas@chalmers.se), (2) Vienna University of Technology, Institute of Geodesy and Geophysics, Vienna (Austria), (3) Technical University Munich, Geodetic Observatory Wettzell (Germany)

During the last years several experimental Very Long Baseline Interferometry (VLBI) sessions have been conducted to observe Global Navigation Satellite System (GNSS) signals with VLBI. Since GNSS satellites usually transmit signals in L-band, radio telescopes with corresponding receiving equipment are necessary to do these observations. Most telescopes involved in the astronomical European VLBI Network (EVN) have L-band capability, but usually telescopes contributing to geodetic observations within the International VLBI Service for Geodesy and Astrometry (IVS) do not. Therefore, special equipment was developed at Wettzell to allow L-band observations via the existing Wettzell S-band receiving system (Kodet et al., 2013). This new equipment was tested in early 2013 during an experiment together with the 25 m telescope at Onsala. One GLONASS satellite was observed on the baseline Onsala-Wettzell for about 1 hour on January 28, 2013. The observed data were correlated at Onsala with the DiFX correlator (Deller et al., 2007) that is widely used in the geodetic VLBI community and fringes were successfully found (Haas et al., 2014). The RMS-scatter of the derived group and phase delays were 1.4 ns and 8.8 ps, respectively, for integration times of 30 s (Haas et al., 2014). In 2013/2014 a satellite scheduling module was written for the Vienna VLBI Software (VieVS) (Hellerschmied et al., 2014). Using this scheduling software, several GLONASS-VLBI tests were planned for the baseline Onsala-Wettzell, this time with observations of several GLONASS satellites. The observations were performed in early 2014 and several hours of data were recorded. The data were correlated at Onsala with DiFX and fringes were successfully found. In this presentation we give an overview on the 2014 test observations, the data correlation, and preliminary results.