Calibration of Mid-Frequency aperture array stations using self-holography

The stations (subarrays) of the Mid-Frequency Aperture Array (MFAA) system for the Square Kilometre Array (SKA) operating in the 450-1450 MHz range are envisaged to have ~ 10 3 to ~ 10 4 receive paths. This will make standard calibration procedures based on the array covariance matrix computationall...

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Bibliographic Details
Published in2017 International Conference on Electromagnetics in Advanced Applications (ICEAA) pp. 967 - 970
Main Author Wijnholds, Stefan J.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2017
Subjects
Antenna arrays
Antenna measurements
Calibration
Correlation
Receiving antennas
Signal to noise ratio
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DOI10.1109/ICEAA.2017.8065418

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Summary:The stations (subarrays) of the Mid-Frequency Aperture Array (MFAA) system for the Square Kilometre Array (SKA) operating in the 450-1450 MHz range are envisaged to have ~ 10 3 to ~ 10 4 receive paths. This will make standard calibration procedures based on the array covariance matrix computationally expensive. In this paper, I therefore propose a method to calibrate the receive path gains during regular observations by correlating the signals from individual receive paths with the signal from a reference beam formed by the same station, i.e., "self-holography". I discuss the performance of this approach using simulations for a realistic MFAA scenario.
DOI:10.1109/ICEAA.2017.8065418