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A Digital-Receiver for the Murchison Widefield Array | | Thiagaraj Prabu
; K. S. Srivani
; D. Anish Roshi
; P. A. Kamini
; S. Madhavi
; David Emrich
; Brian Crosse
; Andrew J. Williams
; Mark Waterson
; Avinash A. Deshpande
; N. Udaya Shankar
; Ravi Subrahmanyan
; Frank H. Briggs
; Robert F. Goeke
; Steven J. Tingay
; Melanie Johnston-Hollitt
; Gopalakrishna M R
; Edward H. Morgan
; Joseph Pathikulangara
; John D. Bunton
; Grant Hampson
; Christopher Williams
; Stephen M. Ord
; Randall B. Wayth
; Deepak Kumar
; Miguel F. Morales
; Ludi deSouza
; Eric Kratzenberg
; D. Pallot
; Russell McWhirter
; Bryna J. Hazelton
; Wayne Arcus
; David G. Barnes
; Gianni Bernardi
; T. Booler
; Judd D. Bowman
; Roger J. Cappallo
; Brian E. Corey
; Lincoln J. Greenhill
; David Herne
; Jacqueline N. Hewitt
; David L. Kaplan
; Justin C. Kasper
; Barton B. Kincaid
; Ronald Koenig
; Colin J. Lonsdale
; Mervyn J. Lynch
; Daniel A. Mitchell
; Divya Oberoi
; Ronald A. Remillard
; Alan E. Rogers
; Joseph E. Salah
; Robert J. Sault
; Jamie B. Stevens
; S. E. Tremblay
; Rachel L. Webster
; Alan R. Whitney
; Stuart B. Wyithe
; | | Date: |
14 Feb 2015 | | 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. | | Source: | arXiv, 1502.5015 | | Services: | Forum | Review | PDF | Favorites | |
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