柿园无线传感器网络信号传输损耗研究

发布时间：2018-04-13 21:03

本文选题：无线传感器网络 + 数据传输　；参考：《农业工程学报》2014年15期

【摘要】：为探究柿园无线传感器网络信号传输特性,该文研究了在2.4 GHz无线信道下柿树处于萌芽期、幼叶期和花期3种时期时无线网络信号传输的衰减情况。试验中分别在柿子树萌芽期、幼叶期和花期3个生长时期下选择一列长势均匀的柿树,通过调节子节点和汇聚节点装置的高度和距离测量柿子树从距离地面3个高度冠层底部(0.8 m)、冠层最密部(1.8 m)和冠层顶部(2.8 m)处各8个距离点的链路质量指示值(link quality indicator,LQI),并对试验数据进行分析。结果表明LQI值随着距离的变化呈正弦曲线式衰减趋势。萌芽期时子节点和汇聚节点的高度均位于冠层顶部时,节点间距38 m时是最佳位置;幼叶期时子节点和汇聚节点的高度均位于冠层顶部,节点间距32 m时是最佳位置;花期时子节点和汇聚节点的高度均位于冠层顶部时,节点间距26 m时是最佳位置。通过对3次数据进行曲线拟合分析分别建立了在2.4 GHz信道下信号衰减模型,其中3种生长时期下均是三次多项式模型决定系数R2最大,为最适模型。果园中无线传感器网络信号传输损耗的研究为在果园中无线传感器网络节点部署提供了技术基础。
[Abstract]:In order to investigate the signal transmission characteristics of Persimmon Garden wireless sensor network, the attenuation of wireless network signal transmission in the period of budding, young leaf and flowering of persimmon trees in 2.4 GHz wireless channel was studied in this paper.In the experiment, a row of persimmon trees with uniform growth was selected under three growth stages: budding stage, young leaf stage and flowering stage, respectively.Measurement of the Link quality indicator of Persimmon Tree at 8 distance points each from 3 heights above the ground by adjusting the height and distance of the sub-node and the convergent node device at the bottom of the canopy (0.8 m), the densest part of the canopy (1.8 m) and the top of the canopy (2.8 m)Quality indicator LQI, and the test data were analyzed.The results show that the LQI values show a sinusoidal attenuation trend with the distance.When the height of the child node and the convergent node is at the top of the canopy, the best position is when the node spacing is 38 m, the height of the child node and the convergent node is both located at the top of the canopy in the young leaf period, and the best position is when the node spacing is 32 m.When the height of the child node and the convergent node are both at the top of the canopy, the best position is when the distance between the nodes is 26 m.Based on the curve fitting analysis of three times of data, the attenuation model of signal in 2. 4 GHz channel is established, in which the cubic polynomial model has the largest determinant coefficient R2 in three growth periods, which is the most suitable model.The study of wireless sensor network signal transmission loss in orchard provides a technical basis for the deployment of wireless sensor network nodes in orchard.
【作者单位】：西北农林科技大学机械与电子工程学院;西北农林科技大学中国旱区节水农业研究院;
【基金】：教育部新世纪优秀人才支持计划资助项目(NCET-12-0473) “十二五”国家科技支撑计划资助项目(2011BAD29B08)
【分类号】：TP212.9;TN929.5;S665.2

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