Real-time Gigabit VLBI system and Internet VLBI system
Real-time Gigabit VLBI system and Internet VLBI system
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实时千兆VLBI系统和互联网VLBI系统
DOI：
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发表时间：
2002
期刊：
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通讯作者：
Y. Ichikawa
中科院分区：
文献类型：
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作者：
T. Kondo;Y. Koyama;J. Nakajima;M. Sekido;R. Ichikawa;E. Kawai;H. Okubo;H. Osaki;M. Kimura;Y. Ichikawa
中国射电天文台的千兆位VLBI系统和互联网VLBI系统的开发是作为两年前启动的新项目“建立空间时空基础设施的关键技术研究”的主题之一进行的。首先，我们开发了一个基于磁带的千兆位VLBI系统。利用该系统进行了一些大地测量VLBI实验。在开发磁带系统的同时，还与日本国家天文台、宇宙航空研究所和日本电报电话公司合作开发了一个实时千兆位VLBI系统。（NTT）。在实时系统中，VLBI数据通过高速ATM网络传输到相关器。2001年6月23日，我们利用鹿岛34 m天线和Usuda 64 m天线成功地进行了第一次实时1 Gbps VLBI实验，并首次成功地探测到了实时条纹。2001年12月12日，除了1 Gbps实时VLBI的成功外，我们还成功地实现了2 Gbps磁带VLBI。另一方面，自1999年以来，一种新的使用IP（互联网协议）技术的实时VLBI系统被称为“IP-VLBI”或“互联网VLBI”，以降低网络成本和扩大连接站点。我们研制的IP-VLBI系统是一个基于PC机的系统，它由PCI总线采样板和PC机软件组成，完成数据的实时发送、接收和相关。
The development of a gigabit VLBI system and an Internet VLBI system at CRL is carried out as one of subjects to promote “Research on key technologies to establish the space-time infrastructure in the space”, a new project started two years ago. First we have developed a tape-based gigabit VLBI system. Some geodetic VLBI experiments were performed using this system. In parallel with the development of the tape-based system, a real-time gigabit VLBI system has been developed in collaboration with National Astronomical Observatory Japan (NAOJ), Institute of Space and Astronautical Science (ISAS) and Nippon Telegraph and Telephone Corp.(NTT). In the real-time system, VLBI data are transmitted through the high speed ATM network to a correlator. We successfully carried out the first real-time 1 Gbps VLBI experiment using Kashima 34m antenna and Usuda 64m antenna on June 23, 2001, and first real-time fringes were successfully detected. In addition to the success in 1 Gbps real-time VLBI, we also succeeded in 2 Gbps tape-based VLBI on December 12, 2001. On the other hand a new real-time VLBI system using IP (Internet protocol) technology called “IP-VLBI” or “Internet VLBI” has been developed since 1999 to reduce network-cost and to expand connection sites. We have been developing the IP-VLBI system as a PC-based system consisting of a PCI-bus sampler board and PC softwares to make real-time data transmission, reception and correlation.