Phasing up the superterp - notes on calibration and S/N improvement
Presentation for the LOFAR status
meeting, Dwingeloo/Bonn, 22 August 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 discuss several aspects of phasing up the superterp post-correlation. Besides the motivation, I emphasize the calibration of phase and delays offsets between the superterp stations (for which I have developed a simple but robust strategy) and the actual S/N improvement that can be achieved. Noise correlations between the superterp stations cause final noise values that are higher than naively expected from the number of added stations. Luckily the effect can be estimated accurately using the intra-superterp correlations (visibilities). This effekt is only significant if there is a bright source within the superterp beam that contributes significantly to the total superterp noise (or system temperature).
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Script last modified on 7 Sep 2010
Last change to this data base entry on 22 Aug 2012