ku波段衛(wèi)星通信雨衰計(jì)算及分析外文翻譯-其他專業(yè)-資料下載頁
2025-01-19 06:41本頁面
【導(dǎo)讀】量和分析了武漢市降雨率及雨衰對(duì)Ku波段衛(wèi)星通信信號(hào)的影響。利用測(cè)得的數(shù)據(jù)，對(duì)不準(zhǔn)確的預(yù)測(cè)模型，提出了一個(gè)改進(jìn)。算法，證明ITU-R提出的預(yù)測(cè)模型是正確的。實(shí)驗(yàn)結(jié)果表明，有必。率控制，通過分集接收來提高鏈路效率。然后有兩個(gè)問題：應(yīng)該提供。多少冗余來滿足鏈路的有效性要求；應(yīng)采取什么措施來對(duì)抗雨衰。鏈路的設(shè)計(jì)要求，實(shí)驗(yàn)結(jié)果不是很符合。衰減，繪制了降雨和信號(hào)衰減之間的關(guān)系圖。圖一顯示了測(cè)量系統(tǒng)的原理。該圖的左側(cè)的是降雨衰耗估。下行鏈路信號(hào)由天線接收，并且其頻率被轉(zhuǎn)增下來的低噪聲B. 轉(zhuǎn)換，并且隨后轉(zhuǎn)到頻譜。最后，通過RS-232接口，信號(hào)電壓被保。右側(cè)是降雨量的測(cè)量。每分鐘(毫米),并發(fā)送數(shù)據(jù)在計(jì)算機(jī)中的數(shù)據(jù)收集器。其中，L是降雨的有效路徑，氣和水蒸氣組成。其中水的蒸氣在不同的天氣變化最大?！?”曲線是降雨試驗(yàn)測(cè)得,“ð”曲線是在ITU-R提供的。如圖所示,由ITU-R提供雨衰模型與武漢地區(qū)實(shí)際情況有。年測(cè)量和在Ku波段雨衰衛(wèi)星通道CCIR估計(jì)”，IEICE，
【正文】 : Perror=*R*R+* (dB) Where , R is the rainfall. Then the modified rainfall 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 the increasing 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, 2021(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, 2021, 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,2021(6):130133. [6] ,Propagation data and prediction methods required for the design of earthspace telemunications systems[S].ITU,Geneva,2021. 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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