Short baseline observations at Geodetic Observatory Wettzell

The Geodetic Observatory Wettzell (GOW), jointly operated by the Federal Agency for
Cartography and Geodesy (BKG), Germany and the Technical University of Munich, Germany is
equipped with three radio telescopes for Very Long Baseline Interferometry (VLBI). Correlation
capability primarily designed for relative positioning of the three Wettzell radio telescopes, i.e. to
derive the local ties between the three telescopes from VLBI raw data in addition to the conventional
terrestrial surveys. A computing cluster forming the GO Wettzell Local Correlator (GOWL) was
installed in 2017 as well as the Distributed FX (DiFX) software correlation package and the Haystack
Observatory Post processing System (HOPS) for fringe fitting and post-processing of the output.
Data pre-processing includes ambiguity resolution (if necessary) as well as the generation of the
geodetic database and NGS card files with uSolve. The final analysis is either carried out with local
processing software (LEVIKA short baseline analysis) or with the Vienna VLBI and Satellite (VieVS)
software. We will present an overview of the scheduling, correlation and analysis capabilities at GOW
and results obtained so. The dataset includes auxiliary files (schedule and log files) which contain
information about the participating antenna, observed sources, clock offset between formatter and GPS time, cable delay, meteorological parameters (temperature, barometric pressure, and relative
humidity) and ASCII files created after fringe fitting and final analysis. The published dataset can be
used by the researchers and scientists to further explore short baseline interferometry.