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DEVELOPMENT OF AN INTERFACE SYSTEM TO ENSURE COMPATIBLITY OF THE EXITING VARIOUS VLBI RECORDING SYSTEMS FOR GLOBAL GEODETIC OBSERVATIONS

Research Project

Project/Area Number 07404022
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionNATIONAL ASTRONOMICAL OBSERVATORY,JAPAN

Principal Investigator

YOKOYAMA Koichi  NATIONAL ASTRONOMICAL OBSERVATORY,PROFESSOR, 地球回転研究系, 教授 (10088784)

Co-Investigator(Kenkyū-buntansha) SAKAI Satoshi  NATIONAL ASTRONOMICAL OBSERVATORY,ASSISTANT, 地球回転研究系, 助手 (80141969)
KUJI Seisuke  NATIONAL ASTRONOMICAL OBSERVATORY,ASSISTANT, 地球回転研究系, 助手 (40132675)
SATO Katsuhisa  NATIONAL ASTRONOMICAL OBSERVATORY,ASSISTANT, 水沢観測センター, 助手 (90178715)
KANEKO Yoshihisa  NATIONAL ASTRONOMICAL OBSERVATORY,ASSISTANT, 地球回転研究系, 助手 (00000175)
MANABE Seiji  NATIONAL ASTRONOMICAL OBSERVATORY,ASSOCIATE PROFESSOR, 地球回転研究系, 助教授 (30000178)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1996: ¥3,900,000 (Direct Cost: ¥3,900,000)
KeywordsVery Long Baseline Interferometry / Global VLBI Network / Geodynamics / 超長基線電波千渉法(VLBI)
Research Abstract

Background
Very Long Baseline Interferometry (VLBI), which was brought into regular operation in early 1980's, has made a number of remarkable scientific accomplishment in the field of geodynamics. They are, first detection of the contemporary plate motions and motions along the plate boundaries, insight of the earth's core by means of nutation, polar motion and earth's variable rotation, precise understanding of angular momentum exchange of solid earth, atmosphere and oceans, establishment of the astronomical reference frame based on precise positioning of extra-galactic radio sources, establishment of terrestrial reference frame based on precise determination of the station coordinates and motions, etc.
However, due to the advent of GPS (Global Positioning System), the role of terrestrial reference system has been gradually taken over by GPS.Hence it is the time for VLBI to clearly define its future scientific targets for the next decade. This will be certainly realized by establishing … More a high-accuracy global VLBI networks for continuous monitoring of the earth's rotation.
On the other hand, according to the history of VLBI system development made in various countries, the exiting recording systems are mutually incompatible. For example, Japanese VLBI community has developed K-4 recording system whose recording format is different from that of US developed and preceding Mark-III system. Also Canadian VLBI community has developed S2 system which has different recording format compared to the Japanese and US systems. This situation has made it difficult to make a concerting global VLBI observation for geodynamic research.
Accomplishments
As the geotic VLBI group of the National Astronomical Observatory, Japan (NAOJ) has only K-4 system, we have been unable of participating global VLBI observations. In order to resolve the problem, we have made effort to deploy K-4 recording system to overseas antenna sites. By the end of the 1995 academic year, we deployed our system to the Urumqi Astronomical Observatory of China and the Crimean Astrophysical Observatory of Ukraine and initiated K-4 global observations.
However, VLBI activities of NAOJ is still restricted to this K-4 network and cannot participate in the Mark-III VLBI networks. Hence we planned to develop an interface system which enables us to handle both K-4 and Mark-III format through this two-year research project.
In this research project, we introduced a set of high density digital tape recorder (DR-101B,made by INTERFEROMETRICS), and developed and installed an interface circuit which is possible to read and write both K-4 and Mark-III formats. This has successfully been accomplished and at present we can operate a network composed of two different recording systems.
Future Plan
During the term of our research project, NASA announced the plan of forming Mark-IV VLBI global networks for continuous 24-hour observations, which is composed of seven networks. Mark-IV recorder is an up-graded version of Mark-III and has a bit rate of 0.5Gb/s. In order to join the NASA Mark-IV network, we still have to grade up our newly developed interface system. Also NAOJ is collaborating with the National Institute for Polar Research to conduct geodetic VLBI observations at the Antarctic Syowa station from the next year. In this project, we are planning to make joint observations with Australian VLBI community. The presently used VLBI system of Australia is Canadian S2 system. Hence we need to develop another interface to make compatibility with S2 system. Thus we are planning to extend our research project to make compatibility among K-4, Mark-IV and S2 systems. This system called 'Multi-Format System' will be completed during1997 to 1998 academic year. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (38 results)

All Other

All Publications (38 results)

  • [Publications] Nastula,J.,S.Manabe: "Influence of the shallow seas on the pressure terms of the EAAM function" 重力・ジオイド海洋測地国際シンポジウム集録(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yang,Z.,S.Manabe,K.Yokoyama,K.Heki: "Comprehensive ocean loading parameters and corrections of gravimetry of sites around East Asia with the spherical harmonic method" 重力・ジオイド海洋測地国際シンポジウム集録(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kameya,O.,T.Sasao,K.Iwadate,T.Hara,K.-H.Sato,S.Kuji,S.Tsuruta,Y.Asaki,and T.Jike: "VLBI observations using the Mizusawa 10m antenna" Proc. 3rd East-Asian Meeting on Astronomy,“Ground-Based Astronomy in Asia",Tokyo,ed.N.Kaifu. 500-501 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 原忠徳、佐藤克久、久慈清助: "VERAの信号電送系について" 1995年度VLBIシンポジウム集録. 53-55 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 寺家孝明、真鍋盛二、鈴木智也、外園大介、面高俊宏: "水沢-鹿児島基線での22GHz帯測地VLBI用電波源サーベイ" 1995年度VLBIシンポジウム集録. 36-37 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 真鍋盛二: "VERAによる地球回転パラメータ決定精度" 1995年度VLBIシンポジウム集録. 60-62 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 真鍋盛二: "VLBIの10年-地球科学への貢献" 天文月報. 88. 152-157 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 横山紘一、真鍋盛二、金子芳久、佐藤克久、久慈清助、酒井俐: "IRIS-P観測網のK-4化について" 1995年度VLBIシンポジウム集録. 32-35 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 鹿児島大学VLBIグループ、宮地竹史、久慈清助: "AOSでの水メーザーのモニター観測" 1995年度VLBIシンポジウム集録. 98-99 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 木内等、中島潤一、浜真一、金子明弘、川口則幸、近田義広、砂田和良、奥村幸子、久慈清助: "高速サンプラとデータレコーダ" 1995年度VLBIシンポジウム集録. 148-151 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 横山紘一: "重力と地球回転" 月刊地球. 号外11. 20-23 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 真鍋盛二: "「VERA計画の現状」1.経緯、5.解析" 1996年度VLBIシンポジウム集録. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 佐藤克久、原忠徳、西尾正則、久慈清助、河野宣之、: "能動型超高安定位相基準電送系システムの開発" 1996年度VLBIシンポジウム集録. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 原忠徳、佐藤克久、久慈清助: "高位相安定信号電送系" 1996年度宇電懇シンポジウム集録. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nastula, J., S.Manabe: "Influence of the shallow seas on the pressure terms of the EAAM function" Proc, Intern.Symp., Gravity, Geoid, and Marine Geodesy 1996. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yang, Z., S.Manabe, K.Yokoyama, K.Heki: "Comprehensive ocean loading parameters and correction of gravity of sites around East Asia with the spherical harmonic method" Proc, Intern.Symp., Gravity, Geoid, and Marine Geodesy 1996. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kameya, O., T.Sasao, K.Iwadate, T.Hara, K.-H.Sato, S.Kuji, S.Tsuruta, Y.Aoki, and T.Jike: "VLBI observations using the Mizusawa 10m antenna" Proc.3rd East-Asian Meeting on Astronomy, "Ground-Based Astronomy in Asia", Tokyo, ed.N.Kaifu. 500-501 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hara, T., K.-H.Sato, S.Kuji: "On the signal transfer system for VERA (in Japanese)." Proc.Japanese Symp.on VLBI 1995. 53-55 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Jike T., S.Manabe, T.Suzuyama, D.Hokazono, T.Omotaka: "Reference source survey of 22GHz geodetic VLBI observation with Mizusawa-Kagoshima baseline (in Japanese)." Proc.Japanese Symp.on VLBI 1995. 36-37 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Manabe S.: "Expected accuracy of earth rotation determination with VERA (in Japanese)." Proc.Japanese Symp.on VLBI 1995. 60-62 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yokoyama K., S.Manabe, H.Kaneko, K-H.Sato, S.Kuji, S.Sakai: "On development of the K-4 system for IRIS-P observation" Proc.Japanese Symp.on VLBI 1995. 32-35 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] VLBI group at Kagoshima University, T.Miyaji, S.Kuji: "Monitoring of H_2O maser objects by AOS (in Japanese)." Proc.Japanese Symp.on VLBI 1995. 98-99 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kiuchi H., J.Nakajima, S.Hama, A.Kaneko, N.Kawaguchi, Y.Chikada, K.Sunada, S.Okumura, S.Kuji: "High speed sampler and data recorder (in Japanese)." Proc.Japanese Symp.on VLBI 1995. 148-151 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Manabe S.: "10 years of VLBI-Contribution to earth science (in Japanese)." The Astronomical Herald. 88. 152-157 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yokoyama K.: "Gravity and earth rotation" Chikyu monthly. Extra 11. 20-23 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Manabe S.: ""Present status of VERA project" 1.Overview, 2.Reduction (in Japanese)." Proc.Japanese Symposium on VLBI 1996. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sato K.-H., T.Hara, M.Nishino, S.Kuji, N.Kawano: "Development of ultra stable actively controlled reference signal transfer system (in Japanese)." Proc.Japanese Symposium on VLBI 1996. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hara T., K.-H.Sato, S.Kuji: "Ultra stable signal transfer system (in Japanese)." Proc.Radio Astronomy Symposium 1996. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kameya,O.,T.Sasao,K.Iwadate,T.Hara,K.-H.Sato,S.Kuji,S.Tsuruta,Y.Asaki,and T.Jike: "VLBI observations using the Mizusawa 10m antenna" Proc.3rd East-AsianMeeting on Astronomy, "Ground-Based Astronomy in Asia",Tokyo,ed.N.Kaifu. 500-501 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 横山紘一、真鍋盛二、金子芳久、佐藤克久、酒井利: "IRIS-P観測網のK-4化について" 1995年度VLBIシンポジウム(1996年1月24日〜26日). 32-35 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 真鍋盛二: "VERAによる地球回転パラメータ決定精度" 1995年度VLBIシンポジウム(1996年1月24日〜26日). 60-62 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 鹿児島大学VLBIグループ、宮地竹史、久慈清助: "AOSでの水メーザーのモニター観測" 1995年度VLBIシンポジウム(1996年1月24日〜26日). 98-99 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 横山紘一: "重力と地球回転" 月刊地球. 号外11. 20-23 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 真鍋盛二: "VLBIの10年-地球科学への貢献" 天文月報. 88. 152-157 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Segawa,J.,I.Nakagawa,T.Tanaka,R.Shichi,T.Kato,K.Yokoyama,Y.Baba,Y.Ganeko,& Y.Okada: "The role of geodesy in the earth environmental study" J.Geod.Soc.Japan. 39. 419-424 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 横山紘一: "重力と地球回転" 月刊地球. 号外11. 20-23 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 真鍋盛二: "VERAによる地球回転パラメータ決定精度" 1995年度VLBIシンポジウム集録. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 横山紘一他: "IRIS-P(太平洋観測網)のK-4化について" 1995年度VLBIシンポジウム集録. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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