GPS on the VLBI Telescopes at Onsala and Ny-Ålesund

Other conference contribution, 2006

In the years 1999 and 2000 the VLBI stations at Onsala and Ny-Ålesund were equipped with GPS antennas mounted on top of the radio telescopes. Since then several GPS measurement campaigns were carried out to check the stability of the telescopes and to monitor the local tie between the reference monuments for the International VLBI Service for Geodesy and Astrometry (IVS) and the International GPS Service (IGS). In this paper we present the results of the analysis of the GPS observations recorded since the antennas were installed.