Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011yera.confe..31n&link_type=abstract
The 41st Young European Radio Astronomers Conference, held at University of Manchester/Jodrell Bank Observatory, 18-20 July 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
In new phased array developments, a fundamental question is whether the geometrical redundant baselines in a regularly arranged phased array are really redundant. Based on real and simulated data, we demonstrate that for a phased array station, a regular arrangement of station elements is necessary but not sufficient to fulfill redundancy calibration requirements. This is due to the electromagnetic interaction between closely spaced antenna elements which leads to non-identical beams and possibly correlated noise. Each of these deterministic effects introduces a bias on the estimated calibration results. Understanding the nature of these effects has helped us to determine applicability and limitations of the redundancy calibration for a given phased array, which are presented in this paper.
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