Details

Autor(en) / Beteiligte

• Offringa, A. R.
• Wayth, R. B.
• Hurley-Walker, N.
• Kaplan, D. L.
• Barry, N.
• Beardsley, A. P.
• Bell, M. E.
• Bernardi, G.
• Bowman, J. D.
• Briggs, F.
• Callingham, J. R.
• Cappallo, R. J.
• Carroll, P.
• Deshpande, A. A.
• Dillon, J. S.
• Dwarakanath, K. S.
• Ewall-Wice, A.
• Feng, L.
• For, B.-Q.
• Gaensler, B. M.
• Greenhill, L. J.
• Hancock, P.
• Hazelton, B. J.
• Hewitt, J. N.
• Hindson, L.
• Jacobs, D. C.
• Johnston-Hollitt, M.
• Kapińska, A. D.
• Kim, H.-S.
• Kittiwisit, P.
• Lenc, E.
• Line, J.
• Loeb, A.
• Lonsdale, C. J.
• McKinley, B.
• McWhirter, S. R.
• Mitchell, D. A.
• Morales, M. F.
• Morgan, E.
• Morgan, J.
• Neben, A. R.
• Oberoi, D.
• Ord, S. M.
• Paul, S.
• Pindor, B.
• Pober, J. C.
• Prabu, T.
• Procopio, P.
• Riding, J.
• Udaya Shankar, N.
• Sethi, S.
• Srivani, K. S.
• Staveley-Smith, L.
• Subrahmanyan, R.
• Sullivan, I. S.
• Tegmark, M.
• Thyagarajan, N.
• Tingay, S. J.
• Trott, C. M.
• Webster, R. L.
• Williams, A.
• Williams, C. L.
• Wu, C.
• Wyithe, J. S.
• Zheng, Q.

Titel

The Low-Frequency Environment of the Murchison Widefield Array: Radio-Frequency Interference Analysis and Mitigation

Ist Teil von

• Publications of the Astronomical Society of Australia, 2015, Vol.32, Article e008

Ort / Verlag

New York, USA: Cambridge University Press

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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).