Conventions on thermal expansion modelling of radio telescopes for geodetic and astrometric VLBI

Details Conventions on thermal expansion modelling of radio telescopes for geodetic and astrometric VLBI Conventions on thermal expansion modelling of radio telescopes for geodetic and astrometric VLBI

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgeod..83..787n&link_type=abstract

Journal of Geodesy, Volume 83, Issue 8, pp.787-792

Astronomy and Astrophysics

Astronomy

13

Geodetic Vlbi, Radio Telescopes, Thermal Expansion

Scientific paper

Thermal expansion of radio telescopes has long been recognized as an effect which cannot be neglected in geodetic and astrometric VLBI data analysis if millimeter accuracy is desired. In this article, the author documents the conventions which are being set by the International VLBI Service for Geodesy and Astrometry (IVS) for a consistent modelling of this effect in its routine product generation. For the largest telescopes, the annual cycle of thermal expansion may change the height of the VLBI reference point by as much as 20 mm. However, for telescopes which are used in present-day IVS operations, the variations rather range from 4 to 6 mm.

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