發(fā)布時間：2018-03-07 07:07

  本文選題：麥田環(huán)境　切入點：無線傳感器網絡　出處：《農業(yè)機械學報》2014年09期 　論文類型：期刊論文

【摘要】：針對麥田環(huán)境無線傳感器網絡(WSN)應用需求,開展了4種無線信道路徑損耗建模方法研究及適用性分析。首先利用WSN節(jié)點進行2.4 GHz無線信號的麥田實地測試,得到不同傳播距離上的路徑損耗變化趨勢;然后分析了自由空間模型、雙射線模型理論計算路徑損耗與實測路徑損耗差異,同時提出改進的雙折線對數距離模型,并采用單折線和改進后的雙折線對數距離模型對實測路徑損耗運用最小二乘法進行回歸分析建模。結果表明:自由空間模型和雙射線模型所計算路徑損耗與實測路徑損耗存在較大差異,無法直接用于麥田環(huán)境路徑損耗建模;單折線和改進后的雙折線對數距離模型的回歸分析擬合度分別為0.879和0.943,回歸剩余標準差分別為3.242和2.229,均適用于麥田無線信道路徑損耗建模,且改進后的雙折線對數距離模型較單折線對數距離模型建模精度更高。
[Abstract]:According to the application requirement of WSNs in wheat field environment, four wireless channel path loss modeling methods and their applicability analysis are carried out. Firstly, the wheat field field test of 2.4 GHz wireless signal is carried out by using WSN node. The variation trend of path loss at different propagation distances is obtained, and then the free space model and the theory of two-ray model are analyzed to calculate the difference between the path loss and the measured path loss, and an improved logarithmic distance model with double broken lines is proposed. The regression analysis of the measured path loss is carried out by using the single broken line and the improved double-fold logarithmic distance model. The results show that the path loss calculated by the free space model and the two-ray model is the same as the measured path loss. There are great differences in path loss, Can not be directly used in wheat field environment path loss modeling; The regression fitting degree of single broken line and improved double broken logarithmic distance model is 0.879 and 0.943, respectively, and the residual standard deviation of regression is 3.242 and 2.229, respectively, which is suitable for the modeling of path loss in wheat field wireless channel. The improved logarithmic distance model is more accurate than that of single broken line logarithmic distance model.
【作者單位】： 西北農林科技大學機械與電子工程學院;
【基金】：“十二五”國家科技支撐計劃資助項目(2012BAH29B04)
【分類號】：TN929.5;TP212.9;S126
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本文編號：1578418