Stefan J. Wijnholds, "Blind calibration of dense irregular
arrays by exploiting mulitply-measured nearly-identical spatial
frequencies," IEEE International Symposium on Antennas and
Propagation (APS), Fajardo (Puerto Rico), 26 June - 1 July 2016.
In this paper, I introduce a novel method for blind calibration of
dense irregular arrays on an arbitrary scene. This method exploits the
fact that in such arrays, several pairs of antennas may sample almost
the same spatial frequency. I demonstrate this method using actual
data from a single aperture array station of the Low Frequency Array
radio telescope. This example showcases the advantages of blind
calibration over calibration based on a source model in actual
operating conditions. The results also indicate that the impact of
errors introduced by modeling nearly-identical spatial frequencies as
being identical may be less than the impact of the commonly made (but
wrong) assumption that all antennas have the same radiation pattern.
The proposed method could thus be an interesting alternative for
calibration of the very compact Low Frequency Aperture Array stations
of the Square Kilometre Array.
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