• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1994 Fiscal Year Final Research Report Summary

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
KeywordsElectomagnetic Cpmpatibility / Hyperbolic Navigation System / Loran-C / Positioning Error / Raido Aids to Navigation / Seto-Oohashi / Decca / Phase Disturbance
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

  • Research Products

    (8 results)

All Other

All Publications (8 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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

URL: 

Published: 1996-04-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi