ku波段衛(wèi)星通信雨衰計(jì)算及分析外文翻譯-資料下載頁
2025-08-21 12:24本頁面
【正文】 all forecasting model is: Ap=Aitur—(*R*R+* ) Fig 4 Relationship between the rain attenuation Fig 5. The error curve.V. CONCLUSION In this paper, the rainfall and Kuband satellite signal attenuation are measured by using the equipments. And then the measured value is pared with the rainfall model provided by the ITUR and some differences are found between the measured and forecasted. We propose a modified algorithm to modify the model provided by ITUR by analyzing the measured data. The result shows that after modifying data will be more consistent with the real value with theincreasing of the measured data number. Signal attenuation is related with the rainfall lasting period. For the same rainfall ratio, the signal attenuation caused by rainfall lasting for 20 minutes is greater then the one for one or two minutes. Meanwhile ,the real situation is very plex and various, especially some factors decided the rain attenuation ,such as the dimension of raindrop, the rainfall distributing on the whole attenuation path, wind velocity and temperature ,they are all even. Then it is necessary for us to set up a longtime observation mechanism to obtain enough data about rainfall attenuation and rainfall. These data will be the important foundation in the research for the Kaband satellite munication in the future.REFERENCES[1]Zulfajri B H, Kiyotaka F, Kenichi I, and Mitsuo of KuBand Rain Attenuation Using Several VSATs in Kyushu Island,Japan[J]. IEEE Antennas and Wireless Propagation Letters, 2002(1): 116119.[2],and ,”Threeyear measurement by VSAT system and CCIR estimation for rain attenuation in Kuband satellite channel, ”IEICE ., .[3]Amaya C, Rogers D V. Characteristics of Rain Fading on KaBand Satellite–Earth Links in a Pacific Maritime Climate[J]. IEEE Trans. On Microwave Theory and Techniques, 2002, 50(1): 4145.[4] Dissanayake A, Allnuh J. A Prediction Model that RainAttenuation and other Propagation Impairments alongEarthSatellite Path[J]. IEEE Trans. On Antennas andPropagation, 1997, 45(10): 15461557.[5] Dong You Choi,Rain attenuation prediction model by using the 1hour rain rate without 1minute rain rate conversion[J].IJCSNS International Journal of Computer Science and Network Security,2006(6):130133.[6] ,Propagation data and prediction methods required for the design of earthspace telemunications systems[S].ITU,Geneva,2003. Author: Xu Kai(M’90) was born in 1965,in Jiangsu, China. He became an associateProfessor in interests include wave propagation, scattering and satellite munication
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