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Rüdiger Haas
Type of contribution: poster

Contributions of the Onsala Space Observatory to the GGOS

Rüdiger Haas, Gunnar Elgered, Thomas Hobiger, Hans-Georg Scherneck, Chalmers University of Technology, Department of Earth and Space Sciences, Onsala Space Observatory, SE-439 92 Onsala (Sweden)

The Onsala Space Observatory is the fundamental geodetic station of Sweden and operates several geodetic and geophysical infrastructures that contribute to the GGOS. Onsala is the European observatory with the longest history in VLBI. Already 1968 Onsala was involved in VLBI observations. Since 1979 the 20 m telescope is used for VLBI, and currently about 40–50 sessions per year are observed in the programs of the IVS. Onsala also participated in all CONT campaigns. In 2011 we received funding for twin telescopes at Onsala, to be part of the VGOS network. A contract to purchase the new telescopes has been signed in late 2014 and we expect that they will become operational in 2016/2017. In parallel to the VLBI activities, the observatory operates other instrumentation for geosciences, in particular receivers for GNSS, and ground-based microwave radiometers. There are several monuments used for GNSS measurements, and Onsala is actively contributing to the IGS. Recently a GNSS array consisting of six new GNSS monuments has been installed. Also several microwave radiometers are operated for tropospheric measurements. A superconducting gravimeter is operated at the observatory since 2009 in a dedicated gravity laboratory which is also hosting visiting absolute gravimeters, and in 2011 a seismometer station has been installed that is part of the Swedish National Seismic Network. Since 2010 we operate a so-called GNSS-R tide gauge. Additional equipment comprises several pressure-sensor based tide gauges, and since the autumn of 2013 a pneumatic tide gauge that is operated together with SHMI. In cooperation with SMHI, a multi-sensor installation, including also a radar-based tide-gauge, has been installed during 2014.