文献类型：期刊文献

中文题名：无线信号在针叶林中的传播性质

英文题名：Transmission properties of wireless signal in coniferous forest

作者：刘海洋[1,2] 于新文[1] 张旭[1] 张雁[2]

第一作者：刘海洋

机构：[1]中国林业科学研究院资源信息研究所;[2]西南林业大学

年份：2016

卷号：1

期号：3

起止页码：127-132

中文期刊名：林业工程学报

外文期刊名：Journal of Forestry Engineering

收录：CSTPCD;;北大核心:【北大核心2014】；

基金：国家高技术研究发展计划("863"计划)(2012AA102003-3)

语种：中文

中文关键词：传感器网络;射频信号;433;MHz无线信号;针叶林

外文关键词：sensor network; radio frequency signal; 433 MHz wireless signal; coniferous forest

分类号：S778

摘要：为解决针叶林中无线传感器网络规划和布署问题,笔者基于无线射频信号的传播特性,研究了中龄樟子松人工林中无线传感器网络信号传播和影响因素的关系。试验选取433 MHz载波频率,基于连续无线电波分析了无线射频信号受植被密度、天线高度和通讯距离等因素联合作用下在实验林中的衰减情况,并对实验数据进行回归分析,建立了实验林中不同影响因素下433 MHz无线射频信号强度与环境因子及通讯距离间的损耗模型。通过对损耗模型的分析,得到了无线传感器网络在不同密度的中龄针叶林中最佳的天线高度和传播距离的分布特征,可为森林环境中无线传感器网络动态组网与数据传输提供依据。
In order to solve the problems of wireless sensor network planning and deployment in coniferous forest,propagation experiments of 433 MHz wireless channel were conducted to analyze the relationship between the signal and the factors affecting the signal propagation in wireless sensor network in the middle-aged Pinus sylvestris forest. The experiment selected three P. sylvestris forests with different vegetation densities. Based on continuous radio wave analysis,it was found that the attenuation of the radio signal in the experimental forests was affected by the vegetation density,the antenna height and the communication distance. Radio signal propagation loss model PR= A- 10n·lg R was used to calculate the empirical value n. Based on the regression analysis of the experimental data,a model was built to establish the relationship between the intensity loss of the 433 MHz signal,the environment factors and the communication distance.The results showed that the communication distance and the antenna height significantly affected the radio signal propagation in the forest,while the forest density was another important factor influencing the radio signal transmission in the forest. The intensity of the radio signals with the same antenna height significantly attenuated with the increase of distance,and the signals from different heights showed different intensities at the same distance. Vegetation density showed a great effect on the radio signal propagation. The greater the vegetation density was,the faster the wireless signal attenuated,and the shorter the transmission distance was. It was concluded that 2. 5 and 3. 0 m were the most suitable heights for the installation of wireless communication equipment. When the vegetation density is very high,the wireless communication equipment should be installed within 60 m to ensure accurate and effective data transmission. The distribution characteristics of the best antenna height and the transmission distance of the wireless sensor network in different vegetation densities of the middle aged coniferous forest were obtained.