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dc.contributor.authorMort, Ben
dc.contributor.authorDulwich, Fen
dc.contributor.authorRazavi-Ghods, Nimaen
dc.contributor.authorAcedo, EDLen
dc.contributor.authorGrainge, Ken
dc.date.accessioned2017-03-06T10:17:22Z
dc.date.available2017-03-06T10:17:22Z
dc.date.issued2017-03en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/262875
dc.description.abstractThe Square Kilometre Array’s Low Frequency instrument (SKA-LOW) will operate in the undersampled regime for most of the frequency band where grating lobes pose particular challenges. To achieve the expected level of sensitivity for SKA-LOW, it is particularly important to understand how interfering sources in both near and far side-lobes of the station beam affect the imaging performance. In this study, we discuss options for station designs, and adopting a random element layout, we assess its effectiveness by investigating how sources far from the main lobe of the station beam degrade images of the target field. These sources have the effect of introducing a noise-like corruption to images, which is called the far sidelobe confusion noise (FSCN). Using $\tiny{OSKAR}$, a software simulator accelerated using graphics processing units, we carried out end-to-end simulations using an all-sky model and telescope configuration representative of the SKA-LOW instrument. The FSCN is a function of both the station beam and the interferometric point spread function, and decreases with increasing observation time until the coverage of the aperture plane no longer improves. Using apodization to reduce the level of near-in sidelobes of the station beam had a notable improvement on the level of the FSCN at low frequencies. Our results indicate that the effects of picking up sources in the sidelobes are worse at low frequencies, where the array is less sparse.
dc.description.sponsorshipThis work used the Wilkes GPU cluster at the University of Cambridge High Performance Computing Service (http://www.hpc.cam.ac.uk/), provided by Dell Inc., NVIDIA and Mellanox, and part funded by STFC with industrial sponsorship from Rolls Royce and Mitsubishi Heavy Industries.
dc.language.isoenen
dc.publisherOxford University Press
dc.subjectinstrumentation: interferometersen
dc.subjecttechniques: interferometricen
dc.subjecttelescopesen
dc.titleAnalysing the impact of far-out sidelobes on the imaging performance of the SKA-LOW telescopeen
dc.typeArticle
prism.endingPage3692
prism.issueIdentifier3en
prism.publicationDate2017en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage3680
prism.volume465en
dc.identifier.doi10.17863/CAM.8166
dcterms.dateAccepted2016-10-31en
rioxxterms.versionofrecord10.1093/mnras/stw2814en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-03en
dc.contributor.orcidRazavi-Ghods, Nima [0000-0003-2930-5396]
dc.identifier.eissn1365-2966
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/stw2814en
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/M001393/1)
cam.issuedOnline2016-11-03en
dc.identifier.urlhttp://dx.doi.org/10.1093/mnras/stw2814en
cam.orpheus.successThu Jan 30 12:56:44 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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