人工林内射频信号传输绕射规律分析

发布时间：2018-06-18 20:09

本文选题：数据传输 + 模型　；参考：《农业工程学报》2015年04期

【摘要】：为解决无线传感器信号在人工林内传输时节点接收不到信号或通信质量差的问题,该文根据人工林的特点,采用4层独立介质简化方法,将人工林内场强模型简化成自由空间模型、衰减屏模型、吸收屏模型3个独立模型,基于波传播的局部性原理和过渡区一致性劈绕射理论,应用Kirchhoff-Huygens近似,推导了吸收屏绕射场强模型。并以白杨木人工林为采样区域采集数据,将90组实测样本平均分为9组,分别用3种模型计算各组的预测值并与实测值进行t检验,结果表明:绕射场强理论预测t值[0.242,2.193]小于t0.05,无显著性差异,可以用理论预测值代替实测值进行信号的分析和计算,距离越近可信度越高,而经验模型和半经验模型存在显著性差异,不适合用于人工林内绕射场强预测。研究结果为无线传感器网络林内优化布置策略提供了一个新思路,成果也可为林区的其他射频信号通讯技术开发提供理论支撑。
[Abstract]:In order to solve the problem that the node can not receive the signal or the communication quality is poor when the wireless sensor signal is transmitted in the artificial forest, according to the characteristics of the plantation, this paper adopts four layers of independent medium simplification method. The field intensity model of artificial forest is simplified into three independent models: free space model, attenuation screen model and absorption screen model. Kirchhoff-Huygens approximation is applied based on the local principle of wave propagation and the consistent splitting diffraction theory of transition zone. The diffraction field intensity model of absorption screen is derived. 90 groups of measured samples were divided into 9 groups on average, and the predicted values of each group were calculated with three kinds of models, and the t test was carried out with the measured values. The results show that the theoretical prediction t value of diffraction field strength [0.242 卤2.193] is less than that of t 0.05, and there is no significant difference. The theoretical prediction value can be used instead of the measured value to analyze and calculate the signal, and the closer the distance is, the higher the reliability is. But there is significant difference between empirical model and semi-empirical model, which is not suitable for prediction of diffraction field intensity in plantation. The results provide a new idea for the optimal layout strategy in the forest of wireless sensor networks, and the results can also provide theoretical support for the development of other radio frequency signal communication technology in the forest area.
【作者单位】：浙江农林大学暨阳学院;北京林业大学工学院;
【基金】：国家自然科学基金(30972425) 浙江省自然科学基金(LY15C16003) 校博士启动基金(2012FR101)
【分类号】：TP212.9;TN929.5

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