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A Study on Electromagnetic Compatibility of Navigation in the Sea Region near Land

Research Project

Project/Area Number 04650050
Research Category

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

Allocation TypeSingle-year Grants
Research Field 応用物理学一般(含航海学)
Research InstitutionHiroshima National College of Maritime Technology

Principal Investigator

SATO Naoto  Hiroshima National College of Maritime Tecnology, Professor, 商船学科, 教授 (00043761)

Co-Investigator(Kenkyū-buntansha) KASAI Seiji  Hiroshima National College of Maritime Tecnology, Associate Professor, 商船学科, 助教授 (70221869)
TAKENAKA Yasuo  Japan Maritime Safety Academy, Professor, 通信工学科, 教授
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥700,000 (Direct Cost: ¥700,000)
KeywordsElectomagnetic Cpmpatibility / Hyperbolic Navigation System / Loran-C / Positioning Error / Raido Aids to Navigation / Seto-Oohashi / Decca / Phase Disturbance / 側位誤差 / 環境電磁工学 / 電子航法 / 航海計器 / 船位誤差 / 地表波伝搬 / 電磁環境 / デッカ航法 / ロラン-C / 双曲線航法 / レーダ障害
Research Abstract

In this thesis, the first chapter gives a review of the progress of historical research of radio wave application and its assignment.
In the second chapter, the behavior of the Loran-C wave near a coast line is discussed. As a ship approaches the seashore, the secondary wave of the Loran-C wave is reradiated from land, and the primary wave and secondary wave overlap each other. Then, the velocity of radio wave resulting from superposition of the primary wave and the secondary wave gets faster and slower in an interval of 750-800m. These results are also interpreted by the numerical calculations. In the third and fourth chapter, the disturbance problems of Decca waves and the Loran-C waves caused by huge bridges are discussed. In order to elcidate theoretically the mechanism of the secondary radiation from Seto-Ohashi-Bridge, several experiments were carried out by using Decca waves. According to these results, a couple of high bridge-towers could be considered to be vertical electric dipole antennas. From the measurements of electric field strength of Decca waves, the static capacitance of each pair of high bridge-towers, which are modeled as a vertical electric dipole antennas, is about 0.2muF.Hence, it is possible to establish an antenna model of the bridge consisting of two parallel vertical electric dipole antennas with 0.2muF static capacitance in each. Furthermore, in order to investigate the magnitude of positioning errors, the phase measurements of Loran-C waves with the receiver, referenced to a highly stable Rubidium beam oscillator, were carried out near Seto-Ohashi bridge. From the results of measurement, it could be observed that in a wide region on both sides of the bridge far from 200m to 1,500m, the phase errors vary from <plus-minus> 0.2mus to <plus-minus> 0.4mus in time. These phase errors correspond to <plus-minus> 60 - <plus-minus> 120m in distance. Finally this thesis is concluded in the fifth

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 佐藤尚登,山下享子,田口一夫,西 隆昭: "ロランC電波の海岸付近における位相じょう乱" 電子情報通信学会論文誌B. J76-B,10. 820-826 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 佐藤尚登,宮崎保光,山下享子,竹中康雄: "デッカ電波の巨大架橋付近におけるじょう乱" 電子情報通信学会論文誌B. J77-B,4. 202-209 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sato N.,Miyazaki Y.Yamasita M.and Takenaka Y.: "Disturbance of Decca Waves Near a Huge Bridge" Journal of Electronics & Communications in Japan A John Willy & Sons,Inc.Company. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 佐藤尚登,宮崎保光,山下享子,竹中康雄: "ロランC電波の巨大架橋付近における位相じょう乱" 電子情報通信学会論文誌B. B-II(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sato N., Ymashita M., Taguchi K., and Nishi T.: "Phase Disturbance of Loran-C Wave near a Coast Line" The Transactions of the Institute of Electronics, Information and Communication Engineers. B,J76-B,10. 820-826 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sato N., Miyazaki Y., Yamashita M.and Takenaka Y.: "Disturbance of Decca Waves Near a Huge Bridge" The Transactions of the Institute of Electronics, Information and Communication Engineers. B,J77-B,4. 202-209 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sato N., Miyazaki Y., Yamashita M.and Takenaka Y.: "Disturbance of Decca Waves Near a Huge Bridge" Journal of Electronics & Communications in Japan A John Willy & Sons Inc.Company. (in print).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sato N., Miyazaki Y., Yamashita M.and Takenaka Y.: "Phase Disturbance of Loran-C Waves Near a Huge Bridge" The Transactions of the Institute of Electronics, Information and Communication Engineers. B,B-II,(in print).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 佐藤尚登,山下享子,田口一夫,西 隆昭: "ロランC電波の海岸付近における位相じょう乱" 電子情報通信学会論文誌B. J76-B,10. 820-826 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 佐藤尚登,宮崎保光,山下享子,竹中康雄: "デッカ電波の巨大架橋付近におけるじょう乱" 電子情報通信学会論文誌B. J77-B,4. 202-209 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Sato N.,Miyazaki Y.Yamasita M.and Takenaka Y.: "Disturbance of Decca Waves Near a Huge Bridge" Journal of Electronics & Communications in Japan A John Willy & Sons,Inc.Company. (印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] 佐藤尚登,宮崎保光,山下享子,竹中康雄: "ロランC電波の巨大架橋付近における位相じょう乱" 電子情報通信学会論文誌B. B-II(印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] 佐藤尚登: "ロランC電波の海岸付近における位相じょう乱" 電子情報通信学会論文集. 820-826 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 佐藤尚登: "デッカ電波の巨大架橋付近におけるじょう乱" 電子情報通信学会論文集. (印刷中).

    • Related Report
      1993 Annual Research Report
  • [Publications] 水井真治 他: "舶用レーダ情報からの船型の検出について" 広島商船高等専門学校紀要. 第15号. 139-153 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 佐藤 尚登: "ロランC電波の海岸付近におけるじょう乱" 電子情報通信学会 発表予定.

    • Related Report
      1992 Annual Research Report
  • [Publications] 佐藤 尚登: "巨大架橋によるデッカ電波のじょう乱" 発表予定.

    • Related Report
      1992 Annual Research Report
  • [Publications] 佐藤 尚登: "舶用レーダ情報からの船型の検出" 発表予定.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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