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

近陆海域航行电磁兼容性研究

• 批准号: 04650050
• 负责人: SATO Naoto
• 金额: $ 1.28万
• 依托单位: Hiroshima National College of Maritime Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650050/
• 关键词: Electomagnetic 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

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

本文第一章回顾了无线电波应用的历史研究进展及其任务。第二章讨论了罗兰C波在海岸线附近的行为。当船舶接近海岸时，罗兰-C波的次级波从陆地重新辐射，并且初级波和次级波相互重叠。然后，一次波和二次波叠加产生的无线电波的速度在750-800m的区间内逐渐变快和变慢。这些结果也可以通过数值计算来解释。第三章和第四章讨论了巨型桥梁引起的Decca波和Loran-C波的扰动问题。为了从理论上阐明濑户大桥二次辐射的机制，利用德卡波进行了多项实验。根据这些结果，几个高桥塔可以被认为是垂直电偶极子天线。根据Decca波电场强度的测量，建模为垂直电偶极子天线的每对高桥塔的静态电容约为0.2μF。因此，可以建立由两个平行的垂直电偶极子天线组成的桥的天线模型，每个天线的静态电容为0.2μF。此外，为了研究定位误差的大小，在濑户大桥附近用接收器参考高度稳定的铷束振荡器进行了罗兰-C波的相位测量。从测量结果可以看出，在桥梁两侧距离200m到1500m的广阔区域内，相位误差随时间变化范围为<正负>0.2mus到<正负>0.4mus。这些相位误差对应于<正负> 60 - <正负> 120 m 的距离。最后这篇论文在第五篇结束

项目成果

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)

Naoto Sato、Yasumitsu Miyazaki、Kyoko Yamashita、Yasuo Takenaka：“Decca 无线电波巨桥附近的干扰” IEICE Transactions B. J77-B，4. 202-209 (1994)

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.

佐藤直人：“海岸附近的罗兰C无线电波的干扰” 预定在电子信息通信工程师研究所发表。

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).

Sato N.、Miyazaki Y.、Yamashita M.和 Takenaka Y.：“一座巨大桥梁附近的 Decca 波的扰动” 电子杂志

佐藤 尚登: "舶用レーダ情報からの船型の検出" 発表予定.

Naoto Sato：将发表“从海洋雷达信息检测船舶类型”。

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).

Sato N.、Miyazaki Y. Yamasita M. 和 Takenaka Y.：“一座巨大桥梁附近的 Decca 波浪的扰动”，日本电子与通信杂志，John Willy & Sons, Inc. 公司（正在出版）。