A STUDY ON NETWORK PERFORMANCE QUALITY AND DATA TRANSMISSION EFFCIENCY FOR SATELLITE COMMUNICATIONS IN RAINY CONDITIONS

雨天卫星通信网络性能质量和数据传输效率研究

• 批准号: 14550388
• 负责人: MAEKAWA Yasuyuki
• 金额: $ 2.3万
• 依托单位: OSAKA ELECTRO-COMMUNICATION UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550388/
• 关键词: Satellite communications; Rain attenuation; Cumulative time percentages; Time duration; Site diversity; Ku band; Ka band; Satellite diversity; 衛生通信回線; 前線; 不稼働率

For the performance of satellite network operations related to the distributions of rain areas in rainy conditions, the effects of satellite diversities are numerically studied using the Ku- and Ku-band rain attenuation data obtained at our university (Neyagawa, Osaka) from the three satellites, SCC,N-Star, and BS, with each separated by 30 deg in azimuth. Using these satellites, the effects of site diversities are also numerically examined among three location, such as the Uji campus of Kyoto University Shigaraki MU observatory and our university with their distances of 20-50 km. The statistics are evaluated during the two years of 2003-2004, using the attenuation data aceumulated at each location. As a result, the yearly time percentages for Ku-band attenuation of 3-4 dB are shown to be reduced from 0.1% to 0.01% by switching operations between the two earth stations using the site diversity techniques. On the other hand, velocities and directions of rain area motions am estimated from the time difference of attenuation occurrence among the three locations. The results of more than 100 rainfall events are compared with those obtained from the cyclones and rainy fronts in weather charts for the past two years. A very good agreement is found between the velocities and directions inferred from the two methods with correlation coefficients of more than 0.9, indicating that the rain cloud motions are just perpendicular to the rain fronts in almost all cases over a horizontal scale of a few 10 km. This nature of rain cloud motions suggests that site and satellite diversity techniques are especially effective when the site or antenna beam locations am aligned in the direction perpendicular to the motion of rain fronts.

为了研究多雨条件下与雨区分布有关的卫星组网作业性能，利用我校(大阪内谷川)的SCC、N-Star和BS三颗卫星的Ku和Ku波段降雨衰减资料，对卫星多样性的影响进行了数值研究。利用这些卫星，还对京都大学茂崎市天文台的Uji校区和距离为20-50公里的我校等三个地点的站点多样性效应进行了数值检验。利用每个地点累积的衰减数据，对2003-2004年两年期间的统计数据进行了评估。结果表明，通过使用站点分集技术在两个地面站之间切换操作，Ku频段衰减3-4db的年时间百分比从0.1%减少到0.01%。另一方面，根据三个地点之间的衰减发生的时间差来估计雨区运动的速度和方向。将超过100次降雨的结果与过去两年气旋和雨锋的天气图结果进行了比较。两种方法得到的速度和方向有很好的一致性，相关系数都在0.9以上，表明在10公里的水平尺度上，几乎所有的雨云运动都是垂直于雨锋的。雨云运动的这种性质表明，当站点或天线波束位置在垂直于雨锋运动的方向对齐时，站点和卫星分集技术特别有效。

项目成果

赤道域と温帯における衛星回線の降雨減衰特性の比較検討

赤道和温带地区卫星链路降雨衰减特性对比研究

• 发表时间: 2004
• 期刊: 平成16年度CPEA公開ワークショップ (印刷中)
• 作者: 前川泰之;藤原正;柴垣佳明;佐藤亨;山本衛;橋口浩之;深尾昌一郎
• 通讯作者: 深尾昌一郎

Ku-Band Long Distance Site-Diversity (SD) Characteristics by Using New Measuring System

使用新测量系统的 Ku 波段长距离站点分集 (SD) 特性

• 发表时间: 2004
• 期刊: IEEE Trans.on AP (Antenna and Propagation) Vol.52, No.6(未定)
• 作者: T.Hatsuda;Y.Aoki;H.Echigo;F.Takahata;Y.Maekawa;K.Fujisaki
• 通讯作者: K.Fujisaki

Y.Sonoi, Y.Maekawa, Z-I.Kawasaki, S.Fukao: "Correlation coefficients between disturbance indexes and updraft associated with lightning discharges observed at two kinds of radars and SAFIR"Proceeding of 12th International Conference on Atmospheric Electric

Y.Sonoi，Y.Maekawa，Z-I.Kawasaki，S.Fukao：“两种雷达和 SAFIR 观测到的与闪电放电相关的扰动指数和上升气流之间的相关系数”第十二届国际大气电会议论文集

Y.Maekawa, Fujiwara, Y.Shibagaki, T.Sato, H.Hashiguchi, M.Yamamoto, S.Fukao: "Effects of Rainfall on Satellite Communication Links from the Equatorial Radar to Japan"XXIII General Assembly of the International Union of Geodesy and Geophysics. Week A. 390-

Y.Maekawa、Fujiwara、Y.Shibagaki、T.Sato、H.Hashiguchi、M.Yamamoto、S.Fukao：“降雨对赤道雷达至日本卫星通信链路的影响”国际大地测量学联盟第二十三届大会

前川泰之, 藤原正, 柴垣佳明, 佐藤亨, 山本衛, 橋口浩之, 深尾昌一郎: "赤道大気レーダーにおける衛星通信回線の降雨減衰測定"平成15年度CPEA公開ワークショップ. 1(印刷中). (2004)

Yasuyuki Maekawa、Tadashi Fujiwara、Yoshiaki Shibagaki、Toru Sato、Mamoru Yamamoto、Hiroyuki Hashiguchi、Shoichiro Fukao：“赤道大气雷达中卫星通信线路的降雨衰减测量”2003 CPEA 公共研讨会 1（出版中）。