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Title: A digital receiver for the Murchison Widefield array
Authors: Prabu, T.
Srivani, K.S.
Kamini, P.A.
Madhavi, S.
Deshpande, A.A.
Udaya Shankar, N.
Subrahmanyan, Ravi
Gopalakrishna, M.R.
Kumar, Deepak
+45 Co-authors
Issue Date: Mar-2015
Publisher: Springer
Citation: Experimental Astronomy, 2015, Vol. 39, p73-93
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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 1572-9508
0922-6435 (Online)
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Copyright: 2015 Springer
Appears in Collections:Research Papers (A&A)

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