Effelsberg sensitivity problem
Presentation for the LOFAR status
meeting, Dwingeloo/Bonn, 12 September 2012
O. Wucknitz [1,2]
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
- Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract
I present recent progress in the analysis of sensitivity problems with the Effelsberg station DE601. The station is not only less sensitive than others, but the sensitivity is also strongly position-dependent. By mapping the beam shape and finding that even in local station coordinates it is not stationary, I came to the conclusion that the element coordinates may be slightly off. Fitting a rotation matrix revealed a rotation of 1.6 deg in the horizontal plane. This result was later confirmed by new geodesic measurements of the positions. Relative to the old positions, the new positions are rotated by exactly those 1.6 deg.
The problem is thus identified. New files with proper element coordinates will be installed soon, and the station calibration will then be repeated.
We hope that this improves the sensitivity of the station significantly!
Much more information is available here.
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Script last modified on 7 Sep 2010
Last change to this data base entry on 13 Sep 2012