Development of the K5/VSSP System

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  • Kondo Tetsuro
    National Institute of Information and Communications Technology Ajou University
  • Koyama Yasuhiro
    National Institute of Information and Communications Technology
  • Ichikawa Ryuichi
    National Institute of Information and Communications Technology, Kashima Space Research Center
  • Sekido Mamoru
    National Institute of Information and Communications Technology, Kashima Space Research Center
  • Kawai Eiji
    National Institute of Information and Communications Technology, Kashima Space Research Center
  • Kimura Moritaka
    National Institute of Information and Communications Technology, Kashima Space Research Center

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  • K5/VSSPシステムの開発

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The National Institute of Information and Communications Technology (NICT) has been contributing to the development of a Very Long Baseline Interferometry (VLBI) system as a technology development center (TDC) of the International VLBI Service for Geodesy and Astrometry (IVS). Since the 1990s NICT has been developing a series of VLBI samplers and hard disk recording systems called K5. The K5 system is designed in such a manner that a commercially sold PC can be used for data recording, and it is dedicated to the transfer of observed raw data through the Internet (e-VLBI). A software correlator has been developed to process the K5 VLBI data. A series of samplers named the Versatile Scientific Sampling Processor (VSSP) can be directly connected to a host PC throuh a PCI-bus intrrface or a USH 2.0 interface, and the latest sampler named VSSP32 supports 4 ch×1 bit×64 MHz sampling per PC (thus, four PCs can support conventional 16 ch observations with a total data rate of 1024 Mbps). Currently, VSSP series samplers are widely being employed not only for geodetic VLBI observations but also for radio astronomical observations and precise time comparisons.

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