Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf....9c&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
7
Scientific paper
The European VLBI Network (EVN) has conducted a dedicated non-standard 5 GHz geodetic VLBI experiment in November 2000 with the goal of improving the positions of the Torun, Westerbork (single dish) and Jodrell Bank Mk2 telescopes. The geodetic coordinates of these telescopes were previously known to a few meters only, which is not sufficient for proper reduction of VLBI observations conducted in phase-referencing mode. The experiment design and data analysis are discussed with special emphasis on the effects of the ionosphere, the dominating error source in such single-frequency observations. Based on various statistical tests, we estimate that the newly-derived telescope positions are accurate to about 5 cm. Additionally, improved geodetic coordinates of the phased-array at Westerbork, the Lovell telescope in Jodrell Bank and Cambridge antenna were obtained using locally-derived ties. Overall, these new EVN telescope positions dramatically improve phase-referencing results.
Alef Walter
Borkowski Kazik
Campbell Robert Moses
Charlot Patrick
Conway John E.
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