摘要
为了揭示电磁波在土壤中传输的一般特性,部署无线地下传感器网络节点,设计了土壤信息采集传感器节点的透地通信试验.试验利用433MHz载波频率无线地下传感器网络节点,通过小麦大田试验和计算机模拟,对不同的接收节点高度、发射节点和接收节点间水平距离等条件下传感器节点电磁波的传输特性进行了研究,建立了接收信号强度和丢包率的关系模型,提出了小麦4个生育期农田土壤信息采集传感器节点在土壤中的传输特性.试验结果表明,接收节点高度变化时,接收节点高度和节点间水平距离对接收信号强度影响的8种模型拟合优度,R^2最大为0.998,R^2最小为0.837;对丢包率影响的8种模型拟合优度,R^2最大为0.998,R^2最小为0.900.节点间水平距离变化时,接收节点高度和节点间水平距离对接收信号强度影响的8种模型拟合优度,R^2最大为0.958,R 2最小为0.847;对丢包率影响的8种模型拟合优度,R^2最大为0.997,R^2最小为0.941.
With deployment of wireless underground sensor network nodes through-the-earth communication tests on soil information acquisition sensor nodes were designed to reveal general characteristics of electromagnetic wave transmission in soil.The electromagnetic wave transmission characteristics of the sensor nodes were studied based on wheat field experiments and computer simulations by using wireless underground sensor network nodes at 433 MHz carrier frequency under various conditions such as different receiving node heights and variable node horizontal distances between transmitting and receiving nodes.A relationship model between received signal strength and packet loss rate was established,and the transmission characteristics of soil information acquisition sensor nodes in four wheat growth stages were put forward.The experiment demonstrate that when the receiving high varies the goodness of fit R^2 under effect of receiving node height on RSSI shows a less variation for eight regression models,namely,the maximum R^2 of RSSI is 0.998 and the minimum is 0.837.For PLR,the ma-ximum goodness is 0.998,and the minimum is 0.900.As the node horizontal distance changes,the maximum goodness of fit R^2 under effect of node horizontal distance on RSSI is 0.958,and the minimum is 0.847.For PLR the maximum goodness is 0.997,while the minimum is 0.941.The result shows that the transmissive characteristics can better predict the received signal intensity under various conditions of through-the-earth communication.The study has provided a technical support to sensor network node deployment and establishment of soil information acquisition system.
作者
郁晓庆
张增林
柴锐
YU Xiaoqing;ZHANG Zenglin;CHAI Rui(Data Science and Technology,North University of China,Taiyuan,Shanxi 030051,China;College of Mechanical and Electronic Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2019年第11期1005-1012,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
山西省应用基础研究项目(201801D221209)
中北大学“333”人才项目(13011921)
国家自然科学基金资助项目(51509207)
关键词
土壤信息采集
透地通信
传感器节点
接收信号强度
丢包率
soil information acquisition
through-the-earth communication
sensor node
received signal strength
packet loss rate
