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A single-FPGA real-time dual beam-former with FX correlation capabilities. First results at the Nançay radio telescope with the FAN antenna array

H. Deschamps 1 C. Viou 2 J. Pezzani 2 P. Abbon 1 R. Ansari 3 C. Beigbeder 4 D. Breton 4 T. Caceres 4 D. Charlet 4 C. Flouzat 1 P. Kestener 5 C. Magneville 1 B. Mansoux 4 C. Pailler 4 M. Taurigna 4 C. Yèche 1
1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 USN - Unité Scientifique de la Station de Nançay
3 BAO-radio
LAL - Laboratoire de l'Accélérateur Linéaire
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 DEDI - Département d'Electronique, des Détecteurs et d'Informatique (ex SEDI)
Abstract : A full-time beam-former for two independent antenna groups, with visibility computation capabilities at a slower rate, have been formerly designed on a single FPGA for the BAO-radio instrument, a radio telescope demonstrator for the study of dark energy by HI probing technique. On the same FPGA, a firmware dedicated for the FAN project at the Nancay radio telescope have been designed, and can provide a full-time dual beam-forming on a single antenna group. It can process an incoming data flow of twelve channels organized each as complex spectrum (2×8bits) of 4096 frequency with a 4GbPS effective rate. The dual-beam capability of the system has been successfully tested on the FAN array with transits on CasA and 3C123 radio sources after a configuration by complex coefficients computed from previous off-line software correlations on CasA. Recently, another beam-forming on 3C123 has been done after a calibration on CasA performed by the beam-former set in correlation mode and a source-tracking.
Keywords : Adders Arrays Clocks Field programmable gate arrays Multiplexing Optical fibers Random access memory
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Conference papers
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http://hal.in2p3.fr/in2p3-00797811
Contributor : Sabine Starita <>
Submitted on : Thursday, March 7, 2013 - 11:39:45 AM
Last modification on : Wednesday, September 23, 2020 - 4:38:38 AM

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H. Deschamps, C. Viou, J. Pezzani, P. Abbon, R. Ansari, et al.. A single-FPGA real-time dual beam-former with FX correlation capabilities. First results at the Nançay radio telescope with the FAN antenna array. 18th IEEE-NPSS Real Time Conference, Jun 2012, Berkeley, United States. pp.3620-3626, ⟨10.1109/TNS.2013.2277663⟩. ⟨in2p3-00797811⟩

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