K-4 VLBI Data-Acquisition System

Publications of the Astronomical Society of Japan

Amagai, Jun¹  Imae, Michito¹  Kiuchi, Hitoshi¹  Hama, Shin'ichi¹ 

[1] Communications Research Laboratory, 4-2-1 Nukui-kita, Koganei, Tokyo 184

关键词: "Instruments: interferometers";    "Techniques: interferometric";    Time;   

DOI  :  10.1093/pasj/49.6.699

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WehavedevelopedanewVLBIsystembasedontheconventionalK-4system,whosedata-acquisitionmodeincludesVLBAandVSOPdatamodes.IndevelopingthenewVLBIdata-acquisitionsystem,multi-bitquantizationsampling,high-speed(wide-bandwidth)datasampling,andthedataacquisitionmodeweretakenintoconsideration.Thenewacquisitionsystemhasone-bitandtwo-bitquantizationsamplingmodesforVLBI,andfour-bitandeight-bitsamplingmodesforgeneral-purposeuse.Thetotaldatarateisupto256Mbps,andupto16videochannelscanbeselected.Anti-aliasingfilteringiscarriedoutinanalog(32MHz),andaftersampling,the16-MHz,8-MHz,etc.filteringsarecarriedoutinthedigitalfilter.Thedigitalfilterisusedbecauseitresultsingoodphasecharacteristics.ThissystemisspeciallydesignedfortheKeyStoneProject,andaninputinterfaceunitisincorporatedintheVSOP.

【 授权许可】

Unknown