本文選題：無線電波 + 路徑損耗��； 參考：《南京郵電大學》2017年碩士論文

【摘要】：近年來,隨著地理信息系統(tǒng)的普及,以數字形式存儲的數字地圖已方便獲取,通過數字地圖可以方便獲取無線傳播鏈路上的地形高度、經緯度等對無線電波傳播有影響的地理因素。本文基于數字地圖,結合ITU建議書提供的電波傳播預測模型,完成了以下工作:第一,分析研究了DTED格式的數字地圖在預測無線電波傳播損耗中的應用問題。能夠通過在數字地圖上選定發(fā)射點與接收點的位置確定一條無線電波傳播路徑,并將此路徑上樣本點的高度、經緯度信息使用txt格式存儲,以便后續(xù)程序調用。第二,分析研究了多種電波傳播預測模型,包括多徑干涉模型、地表繞射模型、單刃峰模型、單圓峰模型和多峰模型。然后根據SEKE算法,在不同的地形條件下調用對應的損耗模型,疊加后計算在接收點的總傳播損耗預測值。并且通過改變接收天線的高度和無線電波的發(fā)射頻率來觀察天線高度和無線電波的工作頻率對電波傳播的影響。第三,在多峰模型中,結合了單刃峰模型,單圓峰模型和Deygout等效法,提出了適用于多障礙物地形下的多峰繞射模型;在傳播路徑上有多個障礙物時,根據地形和障礙物的特點,提出了多障礙物合并等效計算法,提高了計算效率。第四,將本文模型的預測結果與Longley-Rice模型的預測結果和實測值進行對比分析,驗證了本文模型在復雜的山區(qū)地形中能夠更好地反映實際地形對電波傳播的阻擋效應及提供更精確的預測結果。
[Abstract]:In recent years, with the popularity of geographic information systems, digital maps stored in digital form have been easily obtained, through which the terrain height on wireless communication links can be easily obtained. Geographical factors affecting the propagation of radio waves, such as latitude and longitude. Based on the digital map and the radio wave propagation prediction model provided by ITU recommendation, this paper completes the following work: first, the application of digital map in DTED format in the prediction of radio wave propagation loss is analyzed and studied. A radio wave propagation path can be determined by selecting the position of the transmitting point and the receiving point on the digital map, and the height, longitude and latitude information of the sample point on the path can be stored in txt format for the subsequent program to call. Secondly, a variety of radio wave propagation prediction models, including multipath interference model, surface diffraction model, single-edged peak model, single-circular peak model and multi-peak model, are analyzed and studied. Then, according to the SEKE algorithm, the corresponding loss model is called under different terrain conditions, and the total propagation loss prediction value at the receiving point is calculated after superposition. The influence of antenna height and radio wave operating frequency on the propagation of radio wave is observed by changing the height of the receiving antenna and the transmitting frequency of radio wave. Third, in the multi-peak model, combining the single-edged peak model, the single-circular peak model and the Deygout equivalent method, a multi-peak diffraction model suitable for the multi-obstacle terrain is proposed, and when there are multiple obstacles in the propagation path, according to the characteristics of the terrain and obstacles, An equivalent method of combining multiple obstacles is proposed, which improves the efficiency of calculation. Fourthly, the prediction results of this paper are compared with those of Longley-Rice model and the measured values. It is verified that the proposed model can better reflect the blocking effect of the actual terrain on the propagation of radio waves and provide more accurate prediction results in the complex mountainous terrain.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN011

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本文編號：2019687