Stefan J. Wijnholds, "Calibration of Mid-Frequency Aperture Array Stations Using Self-holography," International Conference on Electromagnetics in Advanced Applications (ICEAA), Verona (Italy), 11-15 September 2017.

abstract:
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 ~10³ to ~10⁴ 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.

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