Modelling of correlated signals between subarrays of aperture array stations

Digital beamforming in aperture array stations used in LOFAR and SKA enables the definition of substations. Effects like electromagnetic coupling between antennas in the station may result in unwanted correlated signals in the beamformed output of these substations. In this contribution, we formulat...

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Bibliographic Details
Published in2024 4th URSI Atlantic Radio Science Meeting (AT-RASC) pp. 1 - 4
Main Authors Wijnholds, Stefan J., Bolli, Pietro, Davidson, David B., Labate, Maria Grazia
Format Conference Proceeding
LanguageEnglish
Published URSI 19.05.2024
Subjects
Apertures
Array signal processing
Background noise
Correlation
Mathematical models
Prototypes
Substations
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Summary:Digital beamforming in aperture array stations used in LOFAR and SKA enables the definition of substations. Effects like electromagnetic coupling between antennas in the station may result in unwanted correlated signals in the beamformed output of these substations. In this contribution, we formulate a mathematical model that can be fed by electromaagnetic simulations to describe these correlations. We use this model to make a first assessment of correlated sky background noise on the baseline between two substations in an SKA prototype station. Our findings indicate that further investigation into these effects is warranted to assess their impact on the scientific output of the SKA.
DOI:10.46620/URSIATRASC24/VWVD5153