The signal processing chain of the Low Frequency Aperture Array

Gianni Comoretto; Jader Monari; Carolina Belli; Simone Chiarucci; Francesco Schillirò; Marco Schiaffino; Federico Perini; Andrea Mattana; Monica Alderighi; Sergio d'Angelo; Sandro Pastore; Giovanni Naldi; Giuseppe Pupillo; Marco Poloni; Simone Rustichelli; Riccardo Chiello; Kris Zarb Adami; Alessio Magro

doi:10.1117/12.2561699

13 December 2020 The signal processing chain of the Low Frequency Aperture Array

Gianni Comoretto, Jader Monari, Carolina Belli, Simone Chiarucci, Francesco Schillirò, Marco Schiaffino, Federico Perini, Andrea Mattana, Monica Alderighi, Sergio d'Angelo, Sandro Pastore, Giovanni Naldi, Giuseppe Pupillo, Marco Poloni, Simone Rustichelli, Riccardo Chiello, Kris Zarb Adami, Alessio Magro

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Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 1144571 (2020) https://doi.org/10.1117/12.2561699
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

The SKA LOW telescope is an interferometer composed of 512 stations. Each station consists of 256 electronically steered antennas. The Low Frequency Aperture Array is the portion of the SKA-LOW telescope including the antennas and the related electronics. The LFAA signal processing chain amplifies, transports and combines the signals from the antennas composing each station into a coherent beam. Beamforming is performed in the frequency domain, with stringent requirements on bandpass flatness, linearity in a RFI contaminated spectral region, and allowed signal degradation. We adopted an architecture including a highly optimized oversampled polyphase filterbank for channelization, and a distributed network beamformer. The system has been validated as part of the Aperture Array Verification System, a single station operating at the SKA site in Western Australia.

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Gianni Comoretto, Jader Monari, Carolina Belli, Simone Chiarucci, Francesco Schillirò, Marco Schiaffino, Federico Perini, Andrea Mattana, Monica Alderighi, Sergio d'Angelo, Sandro Pastore, Giovanni Naldi, Giuseppe Pupillo, Marco Poloni, Simone Rustichelli, Riccardo Chiello, Kris Zarb Adami, and Alessio Magro "The signal processing chain of the Low Frequency Aperture Array", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 1144571 (13 December 2020); https://doi.org/10.1117/12.2561699

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