Statistics – Applications
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.g13a..02s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #G13A-02
Statistics
Applications
[1204] Geodesy And Gravity / Control Surveys, [1229] Geodesy And Gravity / Reference Systems, [1294] Geodesy And Gravity / Instruments And Techniques
Scientific paper
From an analysis of regional European VLBI data we evaluate the impact of a VLBI signal path correction model developed to account for gravitational deformations of the antenna structures. The model was derived from a combination of terrestrial surveying methods applied to telescopes at Medicina and Noto in Italy. We find that the model corrections shift the derived height components of these VLBI telescopes' reference points downward by 14.5 and 12.2 mm, respectively. No other parameter estimates nor other station positions are affected. Such systematic height errors are much larger than the formal VLBI random errors and imply the possibility of significant VLBI frame scale distortions, of major concern for the International Terrestrial Reference Frame (ITRF) and its applications. This demonstrates the urgent need to investigate gravitational deformations in other VLBI telescopes and eventually correct them in routine data analysis.
Abbondanza Claudio
Negusini Monia
Petrov Leonid
Sarti Pierguido
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