학술논문
Design of PHAROS2 Phased Array Feed
Document Type
Conference
Author
Navarrini, A.; Monari, J.; Scalambra, A.; Melis, A.; Concu, R.; Naldi, G.; Maccaferri, A.; Cattani, A.; Ortu, P.; Roda, J.; Perini, F.; Comoretto, G.; Morsiani, M.; Ladu, A.; Rusticelli, S.; Mattana, A.; Marongiu, P.; Saba, A.; Schiaffino, M.; Carretti, E.; Schilliro, F.; Urru, E.; Pupillo, G.; Poloni, M.; Pisanu, T.; Nesti, R.; Muntoni, G.; Adami, K. Zarb; Magro, A.; Chiello, R.; Liu, L.; Grainge, K.; Keith, M.; Pantaleev, M.; van Cappellen, W.
Source
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC) URSI Atlantic Radio Science Meeting (AT-RASC), 2018 2nd. :1-4 May, 2018
Subject
Language
Abstract
We describe the design and architecture of PHAROS2, a cryogenically cooled 4–8 GHz Phased Array Feed (PAF) demonstrator with digital beamformer for radio astronomy application. The instrument will be capable of synthesizing four independent single-polarization beams by combining 24 active elements of an array of Vivaldi antennas. PHAROS2, the upgrade of PHAROS (PHased Arrays for Reflector Observing Systems), features: a) commercial cryogenic LNAs with state-of-the-art performance, b) a “Warm Section” for signal filtering, conditioning and single downconversion to select $\text{a}\approx 275\ \text{MHz}$: Intermediate Frequency (IF) bandwidth within the 4–8 GHz Radio Frequency (RF) band, c) an IF signal transportation by analog WDM (Wavelength Division Mutiplexing) fiber-optic link, and d) a FPGA-based Italian Tile Processing Module (iTPM) digital backend. PHAROS2 will be mounted at the primary focus of the 76-m diameter Lovell radio telescope (Jodrell Bank Observatory, UK) for technical and scientific validation.