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MWA tied-array processing I: Calibration and beamformation

Published online by Cambridge University Press:  02 August 2019

S. M. Ord
Affiliation:
CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia
S. E. Tremblay
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Curtin University, Bentley, WA 6102, Australia
S. J. McSweeney
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Curtin University, Bentley, WA 6102, Australia
N. D. R. Bhat
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Curtin University, Bentley, WA 6102, Australia
C. Sobey
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia
D. A. Mitchell
Affiliation:
CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Curtin University, Bentley, WA 6102, Australia
P. J. Hancock
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Curtin University, Bentley, WA 6102, Australia
F. Kirsten
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), GPO Box U1987, Perth, WA 6845, Australia Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, Sweden
Corresponding
E-mail address:

Abstract

The Murchison Widefield Array is a low-frequency Square Kilometre Array precursor located at the Murchison Radio-astronomy Observatory in Western Australia. Primarily designed as an imaging telescope, but with a flexible signal path, the capabilities of this telescope have recently been extended to include off-line incoherent and tied-array beam formation using recorded antenna voltages. This has provided the capability for high-time and frequency resolution observations, including a pulsar science program. This paper describes the algorithms and pipeline that we have developed to form the tied-array beam products from the summation of calibrated signals of the antenna elements, and presents example polarimetric profiles for PSRs J0437-4715 and J1900-2600 at 185 MHz.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2019 

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