油菜大田环境下的WSN信道传播损耗特性建模研究

发布时间：2018-05-11 02:34

本文选题：无线传感器网络 + 信道特性建模　；参考：《计算机应用研究》2017年04期

【摘要】：针对因特定农业环境下无线信道模型缺乏而造成的现场感知业务的优化与分析难题,建立了油菜大田环境下WSN信道传播损耗特征模型。以油菜及其生长大田为例,依据不同的生育期提炼出三个典型的测试场景,采用两种载波频率的无线传感器节点测试大田现场的信号损耗值,对测定结果进行了最小二乘法拟合建模,结果表明,供试大田环境下的WSN信道传播损耗特性与传统的移动信道模型存在较大差异,适合采用多斜率对数阴影衰落经验模型进行表征。以节点的有效传播距离和路径损耗预测值为指标,与free-space、COST321和Egli等经典模型比较,对拟合模型进行有效性验证的结果表明,本模型各项指标与实测数据接近,可为优化和设计较高能量效率的现场感知业务系统提供精准参考。
[Abstract]:In order to solve the problem of optimization and analysis of field perceptual services caused by the lack of wireless channel model in a specific agricultural environment, a WSN channel propagation loss characteristic model in rape field environment was established. Taking rape and its growing field as an example, three typical test scenarios were extracted according to different growth periods. Two carrier frequency wireless sensor nodes were used to test the field signal loss. The least-square fitting model is used to model the measured results. The results show that the propagation loss characteristics of the WSN channel in the field environment are different from those of the traditional mobile channel model. It is suitable to be represented by multi-slope logarithmic shadow fading model. Compared with the free-space COST321 and Egli models, the validity of the fitting model is verified by using the effective propagation distance and path loss prediction value of the node as the index. The results show that the index of this model is close to the measured data. It can provide accurate reference for optimization and design of high energy efficiency field sensing service system.
【作者单位】：广东东软学院计算机科学与技术系;湖南农业大学理学院;
【基金】：国家自然科学基金资助项目(31501227) 广东高校省级重点平台和重大科研资助项目(2015KTSCX165)
【分类号】：S565.4;TP212.9;TN929.5

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