Phase correction of VLBI with water vapour radiometry

Details Phase correction of VLBI with water vapour radiometry Phase correction of VLBI with water vapour radiometry

2007-03-05

arxiv.org/abs/astro-ph/0703066v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to appear in the proceedings of the 8th EVN symposium held in Torun, Poland, September 2006

Scientific paper

We demonstrate phase correction of 3 mm VLBI observations using the scanning 18 GHz to 26 GHz water vapour radiometer at Effelsberg and we demonstrate an absolute accuracy of 15 mm in zenith path delay by comparing with GPS and radiosondes. This accuracy should provide significant improvement in astrometric phase referencing observations. It is not good enough for geodetic VLBI to replace the tropospheric delay estimation but could be used to remove short-term path-length fluctuations and so improve the geodetic observables. We discuss lessons learned and opportunities for further improvement.

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