Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-10-13
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
4 pages, 4 figures, oral presentation at the XXX URSI General Assembly and Scientific Symposium (Istanbul, Turkey, August 13-2
Scientific paper
Direction-dependent effects (DDEs) represent a major challenge both for calibration of new radio telescopes, and for advancing the state of the art of existing ones. Various approaches to the problem are currently in development. This paper describes several WSRT observations where a pointing error -- commonly thought to be a major contributor to DDEs at higher frequencies -- was deliberately introduced. These observations were reduced using the MeqTrees package, using two different approaches to correct for DDEs: differential gain solutions, and a direct solution for pointing errors. The results of this are analysed and compared.
de Bruyn Ger A.
Smirnov Oleg M.
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