Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/vlbi/dokuwiki/lib/exe/fetch.php/difx/meetings/hobart2015/asiaa-activity-difx-hobart-2015.pdf
Дата изменения: Wed Nov 18 09:00:25 2015
Дата индексирования: Tue Apr 12 12:47:35 2016
Кодировка:
DiFXac(vi(esatASIAA
HiroakiNishioka


DiFXgroupinASIAA
· StartedasapartoftheGreenlandTelescope (GLT)project(partneroftheEHTandAPP) · CurrentDiFXgroupmember

· Formermember

­ HiroakiNishioka,LupinLin(Supportscien(sts,real workers) ­ KeiichiAsada,SatokiMatsushita,MakotoInoue(VLBI/ GLTfacultymembers,managementandadvisors) ­ NicolasPradel(SupportScien(st) ­ ZhengMeyer-Zhao(SoRwareengineer) ­ Cheng-YuKuo(Postdoc)


ASIAADiFXac(vi(es
· Zoombandmodeenhancement(automa(c zoomfrequencyselec(onfromVexfile) [Nicolas,Zheng] · Zoombandmodetes(ng[NicolasandH.N] · Simulatordevelopment(enhanced`anoise' fromGeoffCrewandanothersimulator `Datasim')[Zheng,Cheng-yu]


ASIAAcomputerclusterforDiFX
· 1xMasterNode(DELLR720,2x2.00GHzIntelXeon HexaCoreCPU,64GBofmemory,1.2TBoflocaldisk space) · 4xCompu(ngNodes(HPSL230SGen8,2x2.00GHz IntelXeonHexaCoreCPU,48GBofmemory,3TBof localdiskspacepernode) · 40GbpsQDRInfinibandSwitch · 1xStorage(48TB) · 1xMark5C(VLBIdatarecorder/playbacksystem) · 2xMark6justarrived


Zoombandmodetes(ng
· Testforthecorrela(onbetweendata recordedindifferentsamplingschemetoward correla(onwithAPPdata. · Wehaveevaluatedcorrela(onwith Zoombandmodeusingsimulateddata · Asimulator`enoise'wasdeveloped(expanded `anoise'fromGeoffCrew)forthenon-zero baselinesimula(ons(Cheng-Yu,Zheng)


Zoombandtes(ng:methodtotest
· Performseveralrealiza(onsincludingALMA (62.5MHzchannel)andVLBI(32or64MHz channel)sta(ons. · Correlatedatausingzoombandmodeand derivefundamentalquan((es(amplitudes, phase,closurephase,delay,rate) · Comparetheresultsfromthecorrela(on betweenVLBI-VLBIandALMA-VLBIsta(ons.


Zoombandtes(ng simula(onsetup(oneexample)
· · · · ALMA-CARMA-SMAvsAPEX-CARMA-SMA ALMA:62.5MHzx32IFchannels Others:64MHzx32IFchannles Correla(onzooming32MHzforALMA-CARMASMA Correla(onwithoutzoomingforAPEX-CARMASMA Scanfor4spoin(ngtoM87 Sta(s(csweretakenover32IFchannels AnalysishasbeendonewithAIPS

· · · ·


Zoombandmodeexample


Correla(onamplitude


Correla(onamplitude


Delayandrate


Delayandrate


Closurephase


Summaryoftheresults
· Wehaverun4ssimula(onswithandwithout ALMAsta(on(differentsamplingratefrom others). · Wehavedonesta(s(caltests(K-Stest)to comparecorrela(onswithandwithout zoombandmode. · Nosta(s(callysignificantdifferenceswere foundinamplitudes,delay,rate,phase,and closurephase.


Zoombandmodeenhancement (Autozoom)[Zheng,Nicolas]
· Automa(czoomfrequencyselec(onprogram wrimeninPython · IndependentofDiFX(apre-processingtool) · Inputparameters:
­ Vexfile,.v2dfile,scannumber,zoomcase (frequencyarrangement.Tobeexpanded dependingontherequirement)

· Finalproduct:anewv2dfile


Datasimulator(Datasim)
· `Anoise'(0-baselinesimulatordevelopedby GeoffCrew)wasexpandedtonon-0baseline simulator`Enoise'(Cheng-yu,Zheng) · Othersimulator`Datasim'wasdeveloped (algorithmfromAdamandWalter)[Zheng] · Datasimis50(mesfasterthanenoise(3baseline,4s,64MHzx4chsimla(ontakes ~20minutes)


Summary
· Zoombandmodeenhancement(automa(c zoomfrequencyselec(onfromVexfile) [Nicolas,Zheng] · Zoombandmodetes(ng[NicolasandH.N] · Simulatordevelopment(enhanced`anoise' fromGeoffCrewandanothersimulator `Datasim')[Zheng,Cheng-yu]