基于定向天线WSN射频信号传播试验  

Test of wireless sensor network radio frequency signal propagation based on the directional antenna in paddy field

作　　者：孙宝霞[1,2] 王卫星[1,3] 雷刚[1] 郑少雄[1] 

机构地区：[1]华南农业大学工程学院,广东广州510642 [2]广东工程职业技术学院,广东广州510520 [3]华南农业大学南方农业机械与装备关键技术省部共建教育部重点实验室,广东广州510642

出　　处：《广东农业科学》2013年第14期185-188,共4页Guangdong Agricultural Sciences

基　　金：广东省科技计划项目(2010B020315021;2011B020313019)

摘　　要：为解决水稻田中无线传感器网络(WSN)的规划与部署问题,基于无线射频信号的传播特性,研究了水稻田间WSN射频信号与影响因素间的关系,并对全向天线和定向天线在水稻田的通信性能进行了对比分析。试验选取WSN的载波频率为915MHz,分析WSN射频信号受天线高度、天线类型和通信距离等因素联合作用下在水稻田的衰减情况,建立了915 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,并进行数据拟合,拟合曲线的R2最低为0.882、最高为0.934,验证了WSN射频信号衰减程度与通信距离的一致性,为WSN在水稻田的节点部署和天线类型选择提供指导和依据。For configuring WSN system architecture and node deployment in paddy field, 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, and the c.ommunication performances for omni-directional antenna and directional antenna in paddy field were analyzed. In this study, a carrier frequency being 915 MHz was selected and the attenuation of radio wave in paddy field was analyzed based on continuous radio waves in the different combinations of impact factors including antenna heights, antenna type, communication distances etc. Additionally, a WSN RF signal strength linear model was built, with the related determination coefficients for fitting-curves ranging from 0.882 to 0.934, which can prove the consistency between WSN RF signal attenuation degree and communication distance, possibly providing good guidance for WSN system node deployment and antenna type selection in paddy field.

关 键 词：无线传感器网络 定向天线 射频信号 水稻田 

分 类 号：S126[农业科学—农业基础科学]