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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3890

Title: The Murchison widefield arrary: design overview
Authors: Lonsdale, C.J.
Deshpande, A.A.
Gopalakrishna, M.R.
Kamini, P.A.
Kumar, Deepak
Madhavi, S.
Prabhu, T.
Roshi, Anish D.
Udaya Shankar, N.
Srivani, K.S.
and 33 co-authors
Keywords: antenna arrays
astronomy
calibration
imaging
ionosphere
Issue Date: Aug-2009
Publisher: IEEE
Citation: Proceedings of the IEEE, 2009, Vol.97, p1497-1506
Abstract: The Murchison Widefield Array is a dipole-based aperture array synthesis telescope designed to operate in the 80-300 MHz frequency range. It is capable of a wide range of science investigations but is initially focused on three key science projects: detection and characterization of three-dimensional brightness temperature fluctuations in the 21 cm line of neutral hydrogen during the epoch of reionization (EoR) at redshifts from six to ten; solar imaging and remote sensing of the inner heliosphere via propagation effects on signals from distant background sources; and high-sensitivity exploration of the variable radio sky. The array design features 8192 dual-polarization broadband active dipoles, arranged into 512 ldquotilesrdquo comprising 16 dipoles each. The tiles are quasi-randomly distributed over an aperture 1.5 km in diameter, with a small number of outliers extending to 3 km. All tile-tile baselines are correlated in custom field-programmable gate array based hardware, yielding a Nyquist-sampled instantaneous monochromatic uv coverage and unprecedented point spread function quality. The correlated data are calibrated in real time using novel position-dependent self-calibration algorithms. The array is located in the Murchison region of outback Western Australia. This region is characterized by extremely low population density and a superbly radio-quiet environment, allowing full exploitation of the instrumental capabilities.
Description: Open Access.
URI: http://hdl.handle.net/2289/3890
ISSN: 0018-9219
Alternative Location: http://adsabs.harvard.edu/abs/2009IEEEP..97.1497L
http://arxiv.org/abs/0903.1828
http://dx.doi.org/10.1109/JPROC.2009.2017564
Copyright: © 2009 IEEE. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Raman Research Institute's's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
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