27 July 2016 Introduction to the SKA low correlator and beamformer system
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The Square Kilometre Array (SKA) organisation is building a low frequency (50-350 MHz) aperture array to be located in remote Western Australia. The array consists of 512-stations, each consisting of 256-dual polarisation log-periodic antennas. The stations are distributed over a distance of 80km, with the greatest density of stations located in the central core. The input bandwidth is processed in a two stage polyphase filterbank, with the first stage channeliser producing 384 x 781 kHz narrow-band channels. Each station beamforms the antennas together to form a single dual polarisation beam with a bandwidth of 300 MHz (additional beams can also be traded for bandwidth). The second stage polyphase filterbank is located in a system called the Correlator and BeamFormer (CBF) which is the topic of this paper. In the CBF the station signals are first aligned in time. Thereafter the signals are simultaneously correlated and beamformed.
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Grant A. Hampson, Grant A. Hampson, John D. Bunton, John D. Bunton, Andre W. Gunst, Andre W. Gunst, Peter Baillie, Peter Baillie, Jan-Geralt bij de Vaate, Jan-Geralt bij de Vaate, } "Introduction to the SKA low correlator and beamformer system", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99062S (27 July 2016); doi: 10.1117/12.2231524; https://doi.org/10.1117/12.2231524


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