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dc.contributor.authorHickish, Jen
dc.contributor.authorRazavi-Ghods, Nimaen
dc.contributor.authorPerrott, Yvette Chanelen
dc.contributor.authorTitterington, Daviden
dc.contributor.authorCarey, SHen
dc.contributor.authorScott, PFen
dc.contributor.authorGrainge, KJBen
dc.contributor.authorScaife, AMMen
dc.contributor.authorAlexander, Paulen
dc.contributor.authorSaunders, Richarden
dc.contributor.authorCrofts, Men
dc.contributor.authorJavid, Kamranen
dc.contributor.authorRumsey, Cen
dc.contributor.authorJin, TZen
dc.contributor.authorEly, JAen
dc.contributor.authorShaw, Cen
dc.contributor.authorNorthrop, IGen
dc.contributor.authorPooley, Gen
dc.contributor.authorD'Alessandro, Ren
dc.contributor.authorDoherty, Pen
dc.contributor.authorWillatt, GPen
dc.date.accessioned2019-04-16T23:30:12Z
dc.date.available2019-04-16T23:30:12Z
dc.date.issued2018-04-21en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/291703
dc.description.abstract© 2016 The Authors. TheArcminute Microkelvin Imager (AMI) telescopes located at the Mullard RadioAstronomy Observatory near Cambridge have been significantly enhanced by the implementation of a new digital correlator with 1.2MHz spectral resolution. This system has replaced a 750-MHz resolution analogue lag-based correlator, and was designed to mitigate the effects of radio frequency interference, particularly that from geostationary satellites which are visible from the AMI site when observing at low declinations. The upgraded instrument consists of 18 ROACH2 Field Programmable Gate Array platforms used to implement a pair of real-time FX correlators - one for each of AMI's two arrays. The new system separates the down-converted RF baseband signal from each AMI receiver into two sub-bands, each of which are filtered to a width of 2.3 GHz and digitized at 5-Gsps with 8 bits of precision. These digital data streams are filtered into 2048 frequency channels and cross-correlated using FPGA hardware, with a commercial 10 Gb Ethernet switch providing high-speed data interconnect. Images formed using data from the new digital correlator show over an order of magnitude improvement in dynamic range over the previous system. The ability to observe at low declinations has also been significantly improved.
dc.rightsPublisher's own licence
dc.titleA digital correlator upgrade for the Arcminute MicroKelvin Imageren
dc.typeArticle
prism.issueIdentifier4en
prism.publicationDate2018en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.volume475en
dc.identifier.doi10.17863/CAM.38863
dcterms.dateAccepted2018-01-04en
rioxxterms.versionofrecord10.1093/mnras/sty074en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-04-21en
dc.contributor.orcidRazavi-Ghods, Nima [0000-0003-2930-5396]
dc.contributor.orcidPerrott, Yvette Chanel [0000-0002-6255-8240]
dc.contributor.orcidTitterington, David [0000-0003-1431-920X]
dc.contributor.orcidAlexander, Paul [0000-0002-0292-9513]
dc.contributor.orcidSaunders, Richard [0000-0003-3167-5863]
dc.contributor.orcidJavid, Kamran [0000-0002-2089-3964]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2018-01-10en


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