橘园无线传感器网络不同节点部署方式下的射频信号传播试验

为解决橘园中无线传感器网络（WSN）规划和快速部署问题，该文基于无线射频信号的传播特性，研究了橘园中WSN射频信号与影响因素间的关系。试验中选取433 MHz载波频率，基于连续无线电波分析了WSN射频信号受植被深度、天线高度和通信距离等因素联合作用下射频信号在橘园的衰减情况，建立了橘园中不同影响因素作用下，433 MHz无线射频信号接收强度与环境传播因子及通信距离间的线性模型，拟合曲线的R2最低为0.797，最高为0.980，验证了此模型用来预测橘园中影响因素对接收信号强度衰减趋势的可行性；得到了基于无线射频信号接收强度指示下不同植被深度、天线高度和通信距离变化联合作用下的最佳天线高度分布表，为无线传感器网络在橘园中的节点部署提供指导。

Test of wireless sensor network radio frequency signal propagation based on different node deployments in citrus orchards

In this paper, for configuring WSN system architecture and node deployment in citrus orchards, relationship between wireless sensor network (WSN) radio frequency (RF) signal strength attenuation and the corresponding influential factors was studied based on radio wave propagation characteristics. In this study, a carrier frequency being 433MHz was selected and the attenuation of radio wave in citrus orchards was analyzed based on continuous radio waves in the circumstance of different combinations of impact factors including plant depths, antenna heights, communication distances etc. Additionally, a WSN RF signal strength linear model objectively feasible in citrus orchards was built, with the related determination coefficients for fitting-curves ranging from 0.797 to 0.980, in order to ensure the possibility of predicting the tendency of receive signal strength attenuation with the existence of two factors, RF propagation distance and environmental propagation factor. As a consequence, a distributive chart of the best antenna height indicating the combination of different plant depths, antenna heights and communication distance variations was obtained, possibly providing good guidance for WSN system configuration and node deployment in citrus orchards.