Local survey activities at the Onsala Space Observatory 1999--2001

Details Local survey activities at the Onsala Space Observatory 1999--2001 Local survey activities at the Onsala Space Observatory 1999--2001

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..177h&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We describe the local survey activities at the Onsala Space Observatory during 1999-2001. In the summer of 1999 we installed one GPS antenna behind the sub-reflector of the 20 m VLBI telescope and a second one close to the vertex of the paraboloid. They are denoted APEX and VTEX, respectively. Since then we perform campaign type tie-measurements between the reference monuments for the International VLBI Service for Geodesy and Astrometry (IVS) and the International GPS Service (IGS), using these two GPS antennas on the VLBI telescope. So far, the repeatabilities of the determined topocentric up, east and north components are 2.3, 0.8 and 1.0 millimetres for APEX, and 2.8, 0.4 and 1.9 millimetres for VTEX. In spring 2001 we performed a combined local and regional GPS campaign at the observatory and the surrounding region. The campaign lasted for 38 days and included in total 12 stations. Repeatabilities of 1-2 millimetres for the horizontal components and 2-3 millimetres for the vertical component were achieved. Helmert transformation of the 2001 results for the markers at the observatory with respect to results from earlier classical geodetic survey and GPS measurements gave residuals on the level of 2-7 millimetres.

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