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A digital-receiver for the Murchison Widefield Array

Citation

Prabu, T and Srivani, KS and Roshi, DA and Kamini, PA and Madhavi, S and Emrich, D and Crosse, B and Williams, AJ and Waterson, M and Deshpande, AA and Shankar, NU and Subrahmanyan, R and Briggs, FH and Goeke, RF and Tingay, SJ and Johnston-Hollitt, M and Gopalakrishna, MR and Morgan, EH and Pathikulangara, J and Bunton, JD and Hampson, G and Williams, C and Ord, SM and Wayth, RB and Kumar, D and Morales, MF and deSouza, L and Kratzenberg, E and Pallot, D and McWhirter, R and Hazelton, BJ and Arcus, W and Barnes, DG and Bernardi, G and Booler, T and Bowman, JD and Cappallo, RJ and Corey, BE and Greenhill, LJ and Herne, D and Hewitt, JN and Kaplan, DL and Kasper, JC and Kincaid, BB and Koenig, R and Lonsdale, CJ and Lynch, MJ and Mitchell, DA and Oberoi, D and Remillard, RA and Rogers, AE and Salah, JE and Sault, RJ and Stevens, JB and Tremblay, S and Webster, RL and Whitney, AR and Wyithe, SB, A digital-receiver for the Murchison Widefield Array, Experimental Astronomy, 39, (1) pp. 73-93. ISSN 0922-6435 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Springer Science+Business Media Dordrecht

DOI: doi:10.1007/s10686-015-9444-3

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.

Item Details

Item Type:Refereed Article
Keywords:ADC, channelizer, digital-receiver, FPGA, MWA, MRO, PFB, radio astronomy instrumentation, radio telescope, SKA
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Stevens, JB (Dr Jamie Stevens)
ID Code:106294
Year Published:2015
Web of Science® Times Cited:3
Deposited By:Mathematics and Physics
Deposited On:2016-02-04
Last Modified:2016-09-05
Downloads:0

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