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dc.contributor.authorOffringa, A.
dc.contributor.authorWayth, Randall
dc.contributor.authorHurley-Walker, N.
dc.contributor.authorKaplan, D.
dc.contributor.authorBarry, N.
dc.contributor.authorBeardsley, A.
dc.contributor.authorBell, M.
dc.contributor.authorBernardi, G.
dc.contributor.authorBowman, J.
dc.contributor.authorBriggs, F.
dc.contributor.authorCallingham, J.
dc.contributor.authorCappallo, R.
dc.contributor.authorCarroll, P.
dc.contributor.authorDeshpande, A.
dc.contributor.authorDillon, J.
dc.contributor.authorDwarakanath, K.
dc.contributor.authorEwall-Wice, A.
dc.contributor.authorFeng, L.
dc.contributor.authorFor, B.
dc.contributor.authorGaensler, B.
dc.contributor.authorGreenhill, L.
dc.contributor.authorHancock, P.
dc.contributor.authorHazelton, B.
dc.contributor.authorHewitt, J.
dc.contributor.authorHindson, L.
dc.contributor.authorJacobs, D.
dc.contributor.authorJohnston-Hollitt, M.
dc.contributor.authorKapinska, A.
dc.contributor.authorKim, H.
dc.contributor.authorKittiwisit, P.
dc.contributor.authorLenc, E.
dc.contributor.authorLine, J.
dc.contributor.authorLoeb, A.
dc.contributor.authorLonsdale, C.
dc.contributor.authorMcKinley, B.
dc.contributor.authorMcWhirter, S.
dc.contributor.authorMitchell, D.
dc.contributor.authorMorales, M.
dc.contributor.authorMorgan, E.
dc.contributor.authorMorgan, J.
dc.contributor.authorNeben, A.
dc.contributor.authorOberoi, D.
dc.contributor.authorOrd, Stephen
dc.contributor.authorPaul, S.
dc.contributor.authorPindor, B.
dc.contributor.authorPober, J.
dc.contributor.authorPrabu, T.
dc.contributor.authorProcopio, P.
dc.contributor.authorRiding, J.
dc.contributor.authorShankar, N.
dc.contributor.authorSethi, S.
dc.contributor.authorSrivani, K.
dc.contributor.authorStaveley-Smith, L.
dc.contributor.authorSubrahmanyan, R.
dc.contributor.authorSullivan, I.
dc.contributor.authorTegmark, M.
dc.contributor.authorThyagarajan, N.
dc.contributor.authorTingay, Steven
dc.contributor.authorTrott, C.
dc.contributor.authorWebster, R.
dc.contributor.authorWilliams, A.
dc.contributor.authorWilliams, C.
dc.contributor.authorWu, C.
dc.contributor.authorWyithe, J.
dc.contributor.authorZheng, Q.
dc.identifier.citationOffringa, A. and Wayth, R. and Hurley-Walker, N. and Kaplan, D. and Barry, N. and Beardsley, A. and Bell, M. et al. 2015. The Low-Frequency Environment of the Murchison Widefield Array: Radio-Frequency Interference Analysis and Mitigation. Publications of the Astronomical Society of Australia. 32: Article ID e008.

The Murchison Widefield Array is a new low-frequency interferometric radio telescope built in Western Australia at one of the locations of the future Square Kilometre Array. We describe the automated radio-frequency interference detection strategy implemented for the Murchison Widefield Array, which is based on the aoflagger platform, and present 72–231 MHz radio-frequency interference statistics from 10 observing nights. Radio-frequency interference detection removes 1.1% of the data. Radio-frequency interference from digital TV is observed 3% of the time due to occasional ionospheric or atmospheric propagation. After radio-frequency interference detection and excision, almost all data can be calibrated and imaged without further radio-frequency interference mitigation efforts, including observations within the FM and digital TV bands. The results are compared to a previously published Low-Frequency Array radio-frequency interference survey. The remote location of the Murchison Widefield Array results in a substantially cleaner radio-frequency interference environment compared to Low-Frequency Array’s radio environment, but adequate detection of radio-frequency interference is still required before data can be analysed. We include specific recommendations designed to make the Square Kilometre Array more robust to radio-frequency interference, including: the availability of sufficient computing power for radio-frequency interference detection; accounting for radio-frequency interference in the receiver design; a smooth band-pass response; and the capability of radio-frequency interference detection at high time and frequency resolution (second and kHz-scale respectively).

dc.titleThe Low-Frequency Environment of the Murchison Widefield Array: Radio-Frequency Interference Analysis and Mitigation
dc.typeJournal Article
curtin.departmentDepartment of Electrical and Computer Engineering
curtin.accessStatusOpen access via publisher

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