發(fā)布時間：2018-04-18 01:12

  本文選題：Ka頻段衛(wèi)星通信 + 雨衰��； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：隨著毫米波技術(shù)的發(fā)展,衛(wèi)星通信應(yīng)用頻段已向著大容量、高頻段擴展。采用Ka頻段大容量衛(wèi)星通信不僅是我國軍事通信應(yīng)用的必然發(fā)展,同時也能為民用領(lǐng)域高速衛(wèi)星通信多媒體業(yè)務(wù)提供一種嶄新的手段。 對于Ka頻段衛(wèi)星通信系統(tǒng),由于其工作頻率高,降雨所引起的信號衰減較為嚴重。本文首先分析降雨的物理特征,其中包括雨滴形狀、收尾速度、降雨強度、尺寸分布等,重點闡述了降雨引起信號功率衰減的機理；其次,運用ITU-R推薦的雨衰計算模型,根據(jù)我國氣候分布情況,選擇了典型觀測站的相關(guān)參數(shù)作為計算依據(jù),計算當?shù)啬昶骄�超過P%降雨率的雨衰值,分析了雨衰的分布特點；再次,以小型衛(wèi)星移動通信地球站為平臺,建立雨衰測試系統(tǒng),詳細介紹了測試系統(tǒng)的組成和原理,并對測試系統(tǒng)的測量誤差進行了分析,通過在我國部分地區(qū)對Ka頻段地一空鏈路上、下行信號降雨衰減的測試,得出了不同降雨率情況下的信號衰減；最后,將測試結(jié)果和計算結(jié)果進行分析比較,得出計算結(jié)果和測試結(jié)果在工程化應(yīng)用中的實際意義,為Ka頻段衛(wèi)星通信系統(tǒng),尤其是小型衛(wèi)星通信地球站的系統(tǒng)設(shè)計提供較為準確的取值依據(jù)。 本文采用的研究方法有一定的局限性,本次試驗以小型衛(wèi)星移動通信地球站為基礎(chǔ),接收到的衛(wèi)星信號信噪比不高,動態(tài)范圍有限,同時,受時間、試驗經(jīng)費制約,測試的地區(qū)、時間有限,所測數(shù)值并不能完全反映該地區(qū)長期降雨衰減統(tǒng)計特性,在后期的工作中,將選擇更多地區(qū)進行相關(guān)試驗,以期獲得更多試驗數(shù)據(jù),對雨衰數(shù)據(jù)進行補充。
[Abstract]:With the development of millimeter wave technology, the application frequency band of satellite communication has been expanded to large capacity and high frequency band.Ka-band large capacity satellite communication is not only the inevitable development of military communication applications in China, but also provides a new means for high-speed satellite communication multimedia service in civil field.For Ka band satellite communication system, the signal attenuation caused by rainfall is serious because of its high operating frequency.This paper first analyzes the physical characteristics of rainfall, including the shape of raindrops, finishing speed, rainfall intensity, size distribution, etc. The mechanism of signal power attenuation caused by rainfall is described in detail. Secondly, the rain decay calculation model recommended by ITU-R is used.According to the climate distribution in China, the relevant parameters of typical observation stations are selected as the basis of calculation, and the local average annual rainfall rate exceeding P% rainfall rate is calculated, and the distribution characteristics of rain decline are analyzed.Taking the small satellite mobile communication earth station as the platform, the rain decline test system is established. The composition and principle of the test system are introduced in detail, and the measurement error of the test system is analyzed.By testing downlink rainfall attenuation in some areas of China, the attenuation of downlink signal under different rainfall rates is obtained. Finally, the results of test and calculation are analyzed and compared.The practical significance of the calculation results and the test results in the engineering application is obtained, which provides a more accurate basis for the design of the Ka-band satellite communication system, especially the small satellite communication earth station.The research method adopted in this paper has some limitations. This experiment is based on the small satellite mobile communication earth station. The signal to noise ratio (SNR) of the received satellite signal is not high, the dynamic range is limited, at the same time, it is restricted by the time and the test funds.The measured values do not fully reflect the statistical characteristics of long-term rainfall attenuation in the region, and more areas will be selected to carry out the relevant tests in a later period of work, with a view to obtaining more experimental data.Supplement the rain decline data.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN927.2

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本文編號：1766128