不同树种对林间无线传感网信号传播特性的影响

为保证在智慧林业中无线传感器网络信号采集与传输的准确性,探究不同树种对林间无线传感网信号传播特性的影响。本文基于无线信号衰减模型,在五种林区环境中,分别研究了433MHz和2.4GHz频段无线信号的衰减规律,利用对数距离衰减模型对信号接收强度值进行拟合。结果表明：五种环境下信号衰减指数介于2.297～2.853之间,拟合优度在0.907～0.967之间,信号接收强度值与距离之间的关系均符合对数距离衰减模型；通过对不同树种林间两种频段信号的传输衰减特点分析可知,林间无线传感器信号传输的主要影响因素为林分郁闭度,以及低矮灌木等林间障碍物密度,树种不是决定性因素。本文还为实现林区环境中无线传感器网络高效、合理规划和部署提供了重要的参考价值。

Analysis of the influence of different tree species on the signal propagation characteristics of inter-forest wireless sensor networks

Wireless sensor networks require accurate signal collection and transmission in smart forestry.This article explores the effects of different tree species on the signal propagation characteristics of inter-forest wireless sensor networks.This paper relies on a wireless signal attenuation model. In five types of woods composed of different tree species, this paper studied the attenuation of wireless signals in the 433MHz and 2.4GHz bands. The article uses the logarithmic distance attenuation model to fit the experimental results. In five environments, the signal attenuation index is between 2.297 and 2.853, and the goodness of fit is between 0.907 and 0.967. The results show that the relationship between the signal reception strength value and the distance is consistent with the logarithmic distance attenuation model. This article compares the transmission attenuation characteristics of two frequency band signals between different tree species. The results show,the main influencing factors of wireless sensor signal transmission between forests are stand canopy density and density of forest obstacles such as low shrubs, Tree species are not the decisive factor. This article provides an important reference value for the realization of efficient and reasonable planning and deployment of wireless sensor networks in forest areas.