Journal article

Absolving the SSINS of Precision Interferometric Radio Data: A New Technique for Mitigating Faint Radio Frequency Interference

Michael J Wilensky, Miguel F Morales, Bryna J Hazelton, Nichole Barry, Ruby Byrne, Sumit Roy

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC | IOP PUBLISHING LTD | Published : 2019

Abstract

We introduce a new pipeline for analyzing and mitigating radio frequency interference (RFI), which we call Sky-Subtracted Incoherent Noise Spectra (SSINS). SSINS is designed to identify and remove faint RFI below the single baseline thermal noise by employing a frequency-matched detection algorithm on baseline-averaged amplitudes of time-differenced visibilities. We demonstrate the capabilities of SSINS using the Murchison Widefield Array (MWA) in Western Australia. We successfully image aircraft flying over the array via digital television reflection detected using SSINS and summarize an RFI occupancy survey of MWA Epoch of Reionization data. We describe how to use SSINS with new data using..

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University of Melbourne Researchers

Grants

Awarded by NSF


Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)


Funding Acknowledgements

M.W. acknowledges Xiang Zhang for helpful discussions. We would like to thank the development teams of PYUVDATA, NUMPY, SCIPY, SIX, H5PY, PYYAML, ASTROPY, and MATPLOTLIB, which enabled this work. This work was directly supported by NSF grants AST-1643011, AST-1613855, and OAC-1835421. Computation on the Amazon Web Services public cloud was supported by the University of Washington student-led Research Computing Club with funding provided by the University of Washington Student Technology Fee Committee. N.B. is supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. This scientific work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre which is supported by the Western Australian and Australian Governments.