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Advancements in Giga-bit Geodesy e-VLBI Using Super-Sinet: Future Plans and Collaborations

This document outlines the advancements in Giga-bit geodesy e-VLBI utilizing the Super-Sinet network in Japan. Research teams from various institutions, including Gifu University, NAOJ, and NICT, are collaborating on enhancing the accuracy and speed of geodetic measurements. The paper discusses the implementation of high-speed sampling techniques, optical transceivers, and real-time correlators that contribute to increased signal-to-noise ratios and observation frequencies. Future plans aim to connect all Japanese VLBI telescopes with Super-Sinet for improved geodesy and atmospheric gradient estimations.

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Advancements in Giga-bit Geodesy e-VLBI Using Super-Sinet: Future Plans and Collaborations

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  1. Giga-bit Geodesy e-VLBI Using the Super-Sinet Ｈ．Takaba , H. Sudou, K. Wakamatsu(Gifu Univ.) Ｎ.Kawaguchi, Y. Kono, H. Suda (NAOJ) K． Takashima, M. Ishimoto (GSI) T.Kondo, Y. Koyama, M. Sekido, H. Takeuchi (NICT) Japan

  2. e-VLBI network NTT Connection JGN2 Super Sinet Future Plan North American Plate Hokkaido Univ 11m ISAS Usuda 64m NAOJ Mizusawa 20m Amurian Plate NAOJ Nobeyama 45m Gifu Univ. 11m GSI Tsukuba 32m 2002 NAOJ Yakaguchi 32m 2003 NICT Kashima 34m 2005 NAOJ Kagoshima 20m Pacific Plate Philippine Sea Palte

  3. 11m Radio Telescope at Gifu University

  4. Accuracy of the Giga-bit Geodesy e-VLBI • Very high speed Tape base VLBI => 128Mbps～1Gbps Giga-bit e-VLBI => 2Gbps～８Gbps => one order higher! • Merits for Geodesy VLBI Increase of the Signal to the Noise ratio (2-3 times) Increase of the Number of Observations (2-3 times) 　　＝＞　Atmospheric gradient can be estimated

  5. Giga-bit e-VLBI System • High Speed Sampler: NICT 500MHz bandwidth, 2bit sampling =>2Gbps • Optical transceiver: NAOJ Two 2.4Gbps ATM/IP links • Correlator: NAOJ Three Baseline 256 lags with 2Gbps • Analysis Software for Geodesy: Gifu Univ.,NICT & GSI

  6. Geodesye-VLBI using the Super-Sinet Gifu Univ. Tsukuba X 11m Telescope 32m Telescope Real time Correlator A/D converter 2Gbps×4ch A/D converter 2Gbps×4ch S Optical Transceiver OC48(2.4Gbps)×２ Optical Transceiver OC48(2.4Gbps)×２ Gifu Inf. Super Highway Tsukuba CATV WDM WDM Real time Correlator Super- Sinet Super- Sinet Super-Sinet OC48(2.4Gbps) Super-Sinet OC48(2.4Gbps) Super-Sinet OC48(2.4Gbps) Fusion Research Lab. 2003.Oct High Energy Lab. NAOJ（Mitaka City）

  7. K4vsSuper-SINET K4 Super-SINET Results of the K4 and Super-SINET coincident within 3mm !

  8. Future Plan • Wider Band Width e-VLBI ～ 8Gbps, 2/8GHz => 22GHzGeodesy VLBI with GPS ionospheric correction • Connect all the Japanese VLBI telescopes with Super-Sinet ! (within several years)

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