2001 GPS and Classical Survey at Medicina Observatory: Local Tie and VLBI Antenna's Reference Point Determination

Details 2001 GPS and Classical Survey at Medicina Observatory: Local Tie and VLBI Antenna's Reference Point Determination 2001 GPS and Classical Survey at Medicina Observatory: Local Tie and VLBI Antenna's Reference Point Determination

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..161v&link_type=abstract

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

Statistics

Methodology

Scientific paper

During a 6 days campaign in June 2001, we have performed a local survey at Medicina Observatory using classical geodesy and GPS techniques in order to determine the effects of an undergone track repair. We have determined the position of the reference point P within a local and ITRF2000 (epoch 1997.0) reference frames using trilateration and triangulation: Pclas_{loc}^{2001}=(21.580pm0.001,45.536pm0.001,17.699pm0.001) Pclas_{loc}^{2001}=(21.580pm0.001,45.536pm0.001,17.699pm0.001) Pclas_{ITRF2000}^{1997.0}=(4461369.982pm0.001,919596.818pm0.001,4449559.207pm0.001)
Kinematic GPS has also given interesting results:In order to roto-translate the estimated coordinates from the local frame to ITRF2000, thus having the possibility to compare results of both measurement approaches, we have computed a 4+1 parametres transformation using a triangol surveyed with both methods. Comparing results given above with the values obtained making use of the position and velocities given by IERS for Medicina in ITRF2000 the agreement is striking especially for the classical technique. A complete tie between the 3-D forced centered local ground control network (materialised in May 2000) and the widely used older network (which is now experiencing some problems due to the disgregation of the concrete where bolts are situated) has also been realised. This will allow inter-comparison of results obtained by the different campaigns that have been carried out in the last decade. Finally, the position of the ASI-GPS permanent station has been estimated within the local ground control network. Thus, using classical methodology, a precise determination of the VLBI-GPS ex-centre vector has been possible.

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