无线信号在马尾松林中传播特性分析

ANALYSIS OF WIRELESS SIGNAL PROPAGATION CHARACTERISTICS IN PINE FOREST

为解决马尾松林中无线传感器网络的部署、定位和功率控制等问题,研究433 MHz无线信号在马尾松林中的传播特性。实地测量自然生长状态下马尾松林中水平方向距地0.25 m~2.0 m的8个高度40个水平测试点的接收功率。结果表明在不同接收高度下,可以用对数衰减模型来预测433 MHz无线信号在马尾松林中的路径损耗。433 MHz无线信号随着天线高度增加,路径损耗减小,当h=2.0 m时,路径损耗最小。理论值与实测值间的相关系数为0.8599~0.9531。给出适用于马尾松林环境下对数损耗模型的范围及条件,为无线传感器网络在马尾松林环境中的部署、定位和功率控制等提供了依据。

In order to solve the problems of deployment,location and power control of wireless sensor networks in masson pine forests,the propagation characteristics of 433 MHz wireless signals in masson pine forests were studied.The receiving power of 40 horizontal test points at 8 heights from 0.25 m to 2.0 m in the horizontal direction of masson pine forest under natural growth condition was measured in situ.The results show that the logarithmic attenuation model can be used to predict the path loss of 433 MHz wireless signal in masson pine forest at different receiving heights.The path loss of 433 MHz wireless signal decreases with the increase of antenna height.When h=2.0 m,the path loss is the smallest.The correlation coefficient between theoretical value and measured value is 0.8599-0.9531.The scope and conditions of logarithmic loss model suitable for masson pine forest environment are given,which provids a basis for deployment,location and power control of wireless sensor networks in masson pine forest environment.