A STUDY ON TIME DURATION CHARCTERISTICS OF RAIN ATTENUATION AND DATA TRANSMISSION EFFCIENCY FOR SATELLITE COMMUNICATIONS

卫星通信雨衰持续时间特性和数据传输效率研究

• 批准号: 12650403
• 负责人: MAEKAWA Yasuyuki
• 金额: $ 1.34万
• 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650403/
• 关键词: Satellite comunications; Rain Attenuation; Ka-band; Ku-band; Time duration characteristics; raindrop size distribution; Rain front; Unavailable time percentage; 衛星通信回線; 準ミリ波帯; 交差偏波識別度; 前線通過速度; 前線種別; 降雨の水平スケール; 継続時間率

The time duration characteristics of rain attenuation of Ka-band satellite radiowave are investigated related to the kinds of rain fronts, using CS-2, CS-3 and N-Star beacon signals (19., 45 GHz, Right-hand circular polarization, Elevation=49.5 deg) received at the Neyagawa earth station for the past 15 years. For the threshold levels less than 4 dB, warm, cold, and occluded fronts five large cumulative time distribution of rain attenuation, while for the threshold values of more than 5 dB, stationary fronts, shower, and typhoon give large distribution. The duration time distribution of rain attenuation becomes large in the order of cold fronts, stationary fronts, and shower-typhoon events for the threshold values of more than 5 dB, stationary fronts, shower, and typhoon give large distribution. The duration time distribution of rain attenuation becomes large in the order of cold fronts, stationary fronts, and shower-typhoon events for the threshold values of 3-10 dB, Rain attenuation … More ratio of Ka-to Ku-band satellite signals is similarly investigated related to the kinds of rain fronts, using BS (11.84 GHz) and N-Star (19.45 GHz) signals, which have been received in our university (Neyagawa, Osaka) for the past 13 years. A comparatively large attenuation ratio was primarily found, when the cold fronts passed over the earth station in Baiu season. In contrast, a comparatively small ratio was primarily obtained, when the earth station was located to the south of the stationary fronts in Akisame season. A small ratio was also found in summertime shower. This difference seems to be caused by a dominant kind of raindrop size distribution in each season. The effects of satellite diversity on Ka-band ranin attenuation were assessed in three propagation paths with the satellite orbital positions are 110, 132, and 150 E, respectively. The attenuation of each path was observed over the four years of 1995-1998 in our university. The up- and/or down-link Ku-band (14/12 GHz) attenuation was converted to the Ka-band down-link (19, 45 GHz) by the frequency attenuation methods, taking into account the kind of raindrop size distribution in each event. As for the attenuation of 20 dB, time percentage of the cumulative distribution is decreased down to about 60% and 40% of the original 0.01% in two-or three-path diversity systems, respectively.. The effects of satellite diversiyt, however, largely depend on the type of rainfall events Less

利用内河地面站15年来接收到的CS-2、CS-3和N-Star信标信号(19.45 GHz、右旋圆偏振、仰角49.5°)，研究了Ka波段卫星无线电波雨衰减的时长特征。阈值小于4分贝时，暖锋、冷锋和遮挡锋面雨衰减累积时间分布较大，而阈值大于5分贝时，静止锋、阵雨和台风分布较大。降雨衰减的持续时间分布由大到小依次为冷锋、静止锋、阵雨-台风事件，阈值大于5d B时，静止锋、阵雨、台风分布较大。雨衰减的持续时间分布按冷锋、静止锋和阵雨台风事件的顺序依次增大，阈值为3-10分贝，雨衰减…利用我校(大阪内谷川)13年来接收到的BS(11.84 GHz)和N-Star(19.45 GHz)信号，对Ka和Ku波段卫星信号与雨锋类型的比值进行了类似的研究。白云季节冷锋经过地面站时有较大的衰减率。相反，在赤潮季节，当地面站位于静止锋面以南时，主要获得一个相对较小的比率。在夏季阵雨中也发现了一个很小的比例。这种差异似乎是由每个季节雨滴大小分布的一种主导类型造成的。在卫星轨道位置分别为110、132和150 E的三种传播路径上，分析了卫星分集对Ka波段Ranin衰落的影响。在1995-1998年的四年中，我们在我校观察到了每条路径的衰减。通过频率衰减法将Ku波段(14/12 GHz)的上行和/或下行衰减转换为Ka波段(19，45 GHz)的下行衰减，并考虑到每个事件中雨滴的尺寸分布类型。对于20db的衰减，在两径和三径分集系统中，累积分布的时间百分比分别下降到原来的0.01%左右和40%左右。然而，卫星多样性的影响在很大程度上取决于降雨事件的类型。

项目成果

Y.Maekawa: "Year-to Year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc. Of the 2000 International Symposium on Antennas and Propagation (ISAP2000).. Vol.1. 281-284 (2000)

Y.Maekawa：“Ka 波段到 Ku 波段卫星信号衰减比的逐年变化”Proc。

Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, S.Fukao: "Meso-beta to gamma-scale circulations associated with precipitating clouds near the Baiu front observed by the MU and meteorological radar"J. Meteor. Soc. Japan. Vol.78. 69-91

Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, S.Fukao：“与 MU 和气象观测到的 Baiu 锋面附近的降水云相关的中贝塔到伽马尺度环流

Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, and S.Fukao: "Meso-beta to gamma-scle circulations associated with precipitating clouds near the Baiu front observed by the MU and meteorological radar"J. Meteor. Soc. Japan. Vol.78, no

Y.Shibagaki、M.D.Yamanaka、S.Shimizu、H.Uyada、A.Watanabe、Y.Maekawa 和 S.Fukao：“与 MU 和

Y.Maekawa: "Year-to-year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc. of the 2000 International Symposium on Antennas and Propagation. Vol.1. 281-284 (2000)

Y.Maekawa：“Ka 波段到 Ku 波段卫星信号衰减比的逐年变化”Proc。

Y.Shibagaki 他: "Meso-β to γ-scale circulations associated with precipitating clouds near the Baiu front observed by the MUand meteorological radars"J.Meteoro.Soc.Japan. 78・1. 69-91 (2000)

Y. Shibagaki 等人：“与 MU 和气象雷达观测到的 Baiu 锋面附近的降水云相关的中观 β 到 γ 尺度环流”J.Meteoro.Soc.Japan 78・1 (2000)。