油菜大田环境下的WSN信道传播损耗特性建模研究

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...

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Bibliographic Details
Published in计算机应用研究 Vol. 34; no. 4; pp. 1189 - 1194
Main Author 李建辉 王访
Format Journal Article
LanguageChinese
Published 广东东软学院计算机科学与技术系,广东佛山,528225%湖南农业大学理学院,长沙,410128 2017
Subjects
信道特性建模
无线传感器网络
油菜
现场感知
WSN
rapeseed
信道特性建模
channel model
on-site sensing
现场感知
无线传感器网络
油菜
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Summary: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。
Bibliography:51-1196/TP
WSN; channel model; rapeseed ; on-site sensing
Modeling wireless channel transmission loss characteristics under Crop growth big field environment, is further optimization of on-site sensing method of WSN-based crop growth environmental information, and precondition for further design. Taken oilseed rape and its growth big field as example, according to different growth season, three typical test scenes were chosen. Signal loss value had been tested by wireless sensor node using two kinds of carrier frequency. Test result had been put in a fit modelling with least square method. It shows that there is a big difference between WSN channel transmission loss characteristics under testing big field environment and traditional mobile channel model, so it is suitable to characterize it with empirical model of multiple slope logarithmic shadow fading. Taking effective transmission distance of nodes （ dmax ） and predictable value of path loss as index, comparing to traditional models of free-space, COST321,
ISSN:1001-3695
DOI:10.3969/j.issn.1001-3695.2017.04.053