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1988 Fiscal Year Final Research Report Summary

Establishment of the Trans-Pacific VLBI Network for Monitoring the Earth's Variable Rotation

Research Project

Project/Area Number 62420003
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionNational Astronomical Observatory (1988)
緯度観測所 (1987)

Principal Investigator

YOKOYAMA Koichi  National Astronomical Observatory, Professor, 地球回転研究系, 教授 (10088784)

Co-Investigator(Kenkyū-buntansha) MANABE Seiji  National Astronomical Observatory, Associate Professor, 地球回転研究系, 助教授 (30000178)
HARA Tadayoshi  National Astronomical Observatory, Associate Professor, 地球回転研究系, 助教授 (60000171)
KAKUTA Chuichi  National Astronomical Observatory, Professor, 地球回転研究系, 教授 (50000162)
Project Period (FY) 1987 – 1988
KeywordsVery Long Baseline Interferometry / The Earth's Rotation / 時刻同期
Research Abstract

1. Objectives of the Research: (1) To achieve high-precision measurement of the Earth's variable rotation. (2) To achieve high-precision time synchronization between Kashima (Japan) and Richmond (Florida, USA). (3) To conduct data analysis and improve data analysis software. (4) To establish the management system to smoothly operate the Trans-Atrantic VLBI network (IRIS-P).
2. Cooperative Institutes: Although the research group consists solely of the National Astronomical Observatory staff, this research was carried out in close cooperation with two institutes, namely the Communications Research Laboratory (CRL, Japan) and the National Geodetic Survey (NGS, USA). CRL offered the use of K-3 VLBI system at Kashima, and NGS offered the arrangement of the US stations participation in IRIS-P network, as well as correlation of observed video tapes at the correlation center in the United States Naval Observatory.
3. Research Plans: (1) 1987: To initiate the IRSI-P network composed of Kashima of … More CRL (Japan). Richmond (Florida, USA), Ft. Davis (Texas, USA), and Fairbanks (Alaska, USA) and operate it smoothly as the network center for acquiring the data which meet the reseatch objectives, and to conduct data analysis and compare the results with those of CRL and NGS. (2) 1988: To improve observation schedule based on the results derived from 1987 observations, and to refine analysis software.
4. Research Activities: (1) Observation: Monthly 24-hour session observations were completely made as scheduled, by sending 3 observers to Kashima every time. (2) Network Operation: Within half a year from the initiation of the network, the system was established to shipping tapes to and from the correlation center and to send observation schedules to the participating stations through an electronic mail. (3) Data Analysis and Software Improvement: With the aid of CRL cooperation, the results obtained by our software were carefully examined and thereby necessary improvement was made. In June 1988, S. Manabe of the research group visited NGS to discuss matters on data analysis. Eventually, the presently used software has sufficient capability for data analysis as the network center of IRIS-P.
5. Scientific Findings: (1) We determined the Earth's rotation with the precision better than 1 cm. Thus the IRIS-P network is the best among existing three VLBI networks. (2) We found errors of the positions of extragalactic quasars of the order of a few milli-arcseconds. (3) We tied the positions of the participating stations with the global terretrial reference system with the precision of a few cm. (4) We achieved time synchronization between Kashima and Richmond with the precision of 0.5 ns. Less

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] K.Yokoyama;S.Manabe: Proc.IAU Symp.No.128.The Earth's Rotation and Reference Frames for Geodesy and Geodynamics,Coolfont,WV.USA.October,1986.128. 439-444 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hara.;I.Okamoto;T.Sasao: Vistas in Astronomy,Proc.4th Asian-Pacific Regional Meeting,IAU,Beijing,China,October.1987. 31. 647-652 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yoshino;Y.Takahashi;N.Kawaguchi;K.Heki;K.Yokoyama;S.Manabe: Vistas in Astronomy,Proc.4th Asian-Pacific Regional Meeting,IAU,Beijing,China,October.1987. 31. 653-656 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yokoyama;S.Manabe;T.Hara;T.Yoshino;Y.Kawaguchi;N.Kawaguchi: Vistas in Astronomy,Proc.4th Asian-Pacific Regional Meeting,IAU,Beijing,China,October.1987. 31. 657-662 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yoshino;Y.Takahashi;N.Kawaguchi;K.Heki;K.Yokoyama;S.Manabe: Astronomy and Astrophysics.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 真鍋盛二,横山絋一,原忠徳 他: 1987年度経緯度研究会集録. 46-59 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉野泰造,高橋幸雄,川口則幸,横山絋一,真鍋盛二: 1987年度経緯度研究会集録. 60-65 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 横山絋一: 1988年度経緯度研究会集録. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 真鍋盛二,横山絋一: 1988年度経緯度研究会集録. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 横山絋一: 南極・VLBIに関する研究小集会集録. 13-14 (1988)

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      「研究成果報告書概要(和文)」より
  • [Publications] 横山絋一: 南極・VLBIに関する研究小集会集録. 39-43 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Yokoyama; S. Manabe: "The Role of Japan in the New International Earth Rotation Service (Expected Contribution of the Planned Japanese VLBI System VERA)" Proc. IAU Symp. No. 128, The Earth's Rotation and Reference Frames for Geodesy and Geodynamics, Coolfont, WV, USA, October, 1986.128. 439-444 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Hara; I. Okamoto; T. Sasao: "The Japanese VLBI Project VERA (VLBI for the Earth Rotation Study and Astrometry)" Vistas in Astronomy, Proc. 4th Asian-Pacific Regional Meeting. IAU, Beijing, China, October, 1987.31. 647-652 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yoshino; Y. Takahashi; N. Kawaguchi; K. Heki; K. Yokoyama; S. Manabe: "The IRIS-P VLBI Experiment for the Earth Rotation Measurement and Time Comparison" ibid.31. 653-656 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yokoyama; S. Manabe; T. Hara; T. Yoshino; Y. Takahashi; N. Kawaguchi: "The Earth Rotation Parameters Determined with the New IRIS-P VLBI Network" ibid.31. 657-662 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yoshino; Y. Takahashi; N. Kawaguchi; K. Heki; K. Yokoyama; S. Manabe: "Intercomparison of the Earth Rotation Parameters Determined by Two Independent VLBI Networks" Astronomy and Astrophysics.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Manabe; K. Yokoyama; T. Hara; et al.: "Earth Rotation Parameters Derived from VLBI IRIS-P Network" Proc. 1987 Japanese Symposium on Positional Astronomy, January, 1988.46-59 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yoshino; Y. Takahashi; N. Kawaguchi; K. Yokoyama; S. Manabe: "Comparison of the Determined Earth Orientation Parameters between IRIS-P and IRIS-A VLBI Experiments" ibid.60-65 (1988)

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      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yokoyama: "Analysis of Precession and Nutation Based on VLBI Observations" Proc. 1988 Japanese Symposium on Positional Astronomy. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Manabe; K. Yokoyama: "Earth Rotation Parameters and Reference Frames Determined with IRIS-P VLBI Network" ibid.(1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yokoyama: "IRIS Celestial Reference Frame" Proc. Meeting on VLBI Observation in Antarctica. September, 1988.13-14 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yokoyama: "Analysis of Precession and Nutation Based on VLBI Observations" Proc. Meeting on VLBI Observation in Antarctica. September, 1988. 39-43 (1988)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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