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1990 Fiscal Year Final Research Report Summary

Study of the Earth Rotation and the Space Positioning with a Newly Precise VLBI Method

Research Project

Project/Area Number 01041094
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionNational Astronomical Observatory

Principal Investigator

KAKUTA Chuichi  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・重力部門, 教授 (50000162)

Co-Investigator(Kenkyū-buntansha) KAWAGUCHI Noriyuki  National Astronomical Observatory, Radio Astronomy Division, 電波天文学研究系・超長基線干渉計天体物理部門, 助教授 (90214618)
SATO Katsuhisa  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・電波地球計測部門, 助手 (90178715)
FUJISHITA Mitsumi  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・電波地球計測部門, 助手 (60141967)
KUJI Seisuke  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・電波地球計測部門, 助手 (40132675)
HARA Tadayoshi  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・電波地球計測部門, 助教授 (60000171)
SASAO Tetsuo  National Astronomical Observatory, Earth Rotation Division, 地球回転研究系・電波地球計測部門, 教授 (20000177)
Project Period (FY) 1989 – 1990
KeywordsVLBI / VLBI backend / radio astronomy / antenna / correlator / radio wave propagation
Research Abstract

The purpose of this study is, to research international activities of the VLBI (Very Long Baseline Interferometer) to establish a much more accurate VLBI system in Japan, VERA (VLBI for the Earth Rotation Study and Astrometry).
Investigations have been made in Australia, U. S. A., Canada, Germany, Sweden, Netherland and U. K. Main results are as follows :
1. Antenna and the VLBI system
Old and new large radio telescopes were investigated. Displacements of the reference point of the an tenna and deformations of the optical system of the antenna were well corrected at Wettzell's antenna, Germany.
2. The VLBI hardware systems and correlators
Researches were made on the frontend, frequency standard, phase delay calibrator and optical fiber system. Data acquisition terminals are strongly requested for the capability of compatibility ofthe VLBI backend.
3. Excess path delay (EPD) of the radio wave propagation
The EPD are well determined in the clear-air day. But in the case of rainfall and heavy cloudy days measurements of water vapor in the atmosphere may be determined by VHF, Radio Acoustic Sounding System and the precipitation.
4. International cooperative observation with the VLBI backend K4
Experimental VLBI observations between the DLR, Institute fur Hochfrequenztechnik, Germany with the portable VLBI backend system K4 and the Nobeyama Radio observatory with the backend Mrak 3 have been made and proved the compatibility between K4 and Mark 3.
5. Compatibility of the VLBI backend and study of the correlator
At Haystack Observatory, U. S. A. a new backend Mark 4 is now developing and the Mark 4 correlator has been studied. The United States Navy Observatory has been operating the Mark 3A correlator. It needs management of the VLBI tapes in order to operate the VLBI network smoothly.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 角田 忠一: "リモ-トセンシングによる大気水蒸気量測定" GPS研究会集録. 169-173 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 角田 忠一: "リモ-トセンシングによる大気水蒸気分布の地上観測" 国立天文台水沢観測センタ-技報. 2. 71-82 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 角田 忠一: "放射計、レ-ダ-およびライダ-による大気水蒸気量の測定" 1989年度経緯度研究会集録. 260-264 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 角田 忠一: "降雨中の大気水蒸気量の測定" 1990年度経緯度研究会集録. 119-128 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 角田 忠一: "Measurments of Water Vapor during the Rain fall" 測地学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 原 忠徳: "西ドイツとアメリカにおけるVLBIハ-ドウェアシステムの現状" 1989年度経緯度研究会集録. 227-231 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤下 光身: "豪・北欧・北米のVLBI事情と将来計画" 1989年度経緯度研究会集録. 232-236 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chuichi KAKUTA: "Remote sensing of the atmospheric water vapor from the ground-based measurements" Proc. Japanese Symp. on GPS. 169-173 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chuichi KAKUTA: "Remote sensing of the atmospheric water vapor distribution with ground-based measurements" The Technical Report of the Mizusawa Kansoku Center, National Astronomical Observatory. 2. 71-82 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chuichi KAKUTA: "Measurements of the atmospheric water vapor by using radiometers, radars and liders" Proc. Japanese Symp. on Earth Rotation, Astrometry, and Geodesy. 260-264 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chuichi KAKUTA: "Measurements of the atmospheric water vapor during rainfall" Proc. Japanese Symp. on Earth Rotation, Astrometry, and Geodesy. 119-128 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chuichi KAKUTA: "Measurements of water vapor during rainfall" J. Geod. Soc. Japan.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tadayoshi HARA: "VLBI hardware system in FRG and USA" Proc. Japanese Symp. on Earth Rotation, Astrometry, and Geodesy. 227-231 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mitsumi FUJISHITA: "Status and plan of Australia, North European, and North American VLBI" Proc. Japanese Symp. on Earth Rotation, Astrometry, and Geodesy. 232-236 (1990)

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

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Published: 1993-08-12  

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