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Proceedings Paper

Real-time VLBI system using telephone network for online system diagnosis
Author(s): Masanori Nishio; Qinghui Liu; Tomoyuki Miyazaki; Toshihiro Omodaka; Masaki Morimoto; Noriyuki Kawaguchi; Tetsuo Sasao; Seisuke Kuji
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Paper Abstract

A real-time VLBI (Very Long Baseline Interferometer) system using conventional telephone lines is proposed. This system enables us to check if the VLBI network is alive by on-line manner, which is useful to reduce the loss of observation time caused by system malfunctions. In this system, a beacon of satellite or the emission from cosmic maser sources is received. The narrow-band spectral profile of the received signal leads us to compress the data up to the size less than the capacity of transmission rate on conventional telephone lines, that is to say a few tens of kbps. Additional devices for the real-time operation are A-D converters, PCs and modems, which are not special ones. As the link between the VLBI stations is performed by the conventional way, the system is applied not only to domestic VLBI networks, but also to international VLBI networks, in which a part of the VLBI stations is located in rural place. It has been confirmed that the cross-correlation is clearly detected for the compressed beacon wave data.

Paper Details

Date Published: 3 July 2000
PDF: 9 pages
Proc. SPIE 4015, Radio Telescopes, (3 July 2000); doi: 10.1117/12.390446
Show Author Affiliations
Masanori Nishio, Kagoshima Univ. (Japan)
Qinghui Liu, Kagoshima Univ. (Japan)
Tomoyuki Miyazaki, Kagoshima Univ. (Japan)
Toshihiro Omodaka, Kagoshima Univ. (Japan)
Masaki Morimoto, Kagoshima Univ. (Japan)
Noriyuki Kawaguchi, National Astronomical Observatory (Japan)
Tetsuo Sasao, National Astronomical Observatory (Japan)
Seisuke Kuji, National Astronomical Observatory (Japan)


Published in SPIE Proceedings Vol. 4015:
Radio Telescopes
Harvey R. Butcher, Editor(s)

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