A digital-receiver for the MurchisonWidefield Array
Journal
Date Issued
2015
Author(s)
Prabu, Thiagaraj
•
Srivani, K. S.
•
Roshi, D. Anish
•
Kamini, P. A.
•
Madhavi, S.
•
Emrich, David
•
Crosse, Brian
•
Williams, Andrew J.
•
Waterson, Mark
•
Deshpande, Avinash A.
•
Shankar, N. Udaya
•
Subrahmanyan, Ravi
•
Briggs, Frank H.
•
Goeke, Robert F.
•
Tingay, Steven J.
•
Johnston-Hollitt, Melanie
•
R, Gopalakrishna M.
•
Morgan, Edward H.
•
Pathikulangara, Joseph
•
Bunton, John D.
•
Hampson, Grant
•
Williams, Christopher
•
Ord, Stephen M.
•
Wayth, Randall B.
•
Kumar, Deepak
•
Morales, Miguel F.
•
deSouza, Ludi
•
Kratzenberg, Eric
•
Pallot, D.
•
McWhirter, Russell
•
Hazelton, Bryna J.
•
Arcus, Wayne
•
Barnes, David G.
•
•
Booler, T.
•
Bowman, Judd D.
•
Cappallo, Roger J.
•
Corey, Brian E.
•
Greenhill, Lincoln J.
•
Herne, David
•
Hewitt, Jacqueline N.
•
Kaplan, David L.
•
Kasper, Justin C.
•
Kincaid, Barton B.
•
Koenig, Ronald
•
Lonsdale, Colin J.
•
Lynch, Mervyn J.
•
Mitchell, Daniel A.
•
Oberoi, Divya
•
Remillard, Ronald A.
•
Rogers, Alan E.
•
Salah, Joseph E.
•
Sault, Robert J.
•
Stevens, Jamie B.
•
Tremblay, S.
•
Webster, Rachel L.
•
Whitney, Alan R.
•
Wyithe, Stuart B.
Abstract
An FPGA-based digital-receiver has been developed for a low-frequency imaging radio interferometer, the Murchison Widefield Array (MWA). The MWA, located at the Murchison Radio-astronomy Observatory (MRO) in Western Australia, consists of 128 dual-polarized aperture-array elements (tiles) operating between 80 and 300 MHz, with a total processed bandwidth of 30.72 MHz for each polarization. Radio-frequency signals from the tiles are amplified and band limited using analog signal conditioning units; sampled and channelized by digital-receivers. The signals from eight tiles are processed by a single digital-receiver, thus requiring 16 digital-receivers for the MWA. The main function of the digital-receivers is to digitize the broad-band signals from each tile, channelize them to form the sky-band, and transport it through optical fibers to a centrally located correlator for further processing. The digital-receiver firmware also implements functions to measure the signal power, perform power equalization across the band, detect interference-like events, and invoke diagnostic modes. The digital-receiver is controlled by high-level programs running on a single-board-computer. This paper presents the digital-receiver design, implementation, current status, and plans for future enhancements.
Volume
39
Issue
1
Start page
73
Issn Identifier
0922-6435
Ads BibCode
2015ExA....39...73P
Rights
open.access
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