基于不同种植密度的玉米大田环境无线传感器网络射频信号损耗研究

Research on the wireless sensor networks radio frequency signal loss based on different planting density corn environment

为了在玉米大田中合理布置无线传感器网络节点,研究了2.4GHz无线传感器射频信号在大喇叭口期玉米田地的信号衰减情况,以3个水平种植密度在田间进行随机试验,选取传输距离和天线高度作为影响因素,利用Matlab进行曲线拟合与分析。研究表明,种植密度对信号衰减程度有一定影响,种植密度越大,植株越密集,植株的散射、反射、漫射更严重,导致信号衰减的斜率增加;根据射频信号传播模型中的环境影响因子n与天线高度h的线性关系,依据Matlab建立了数学模型,数学模型的理论值与实际测量值之间的相关度在0.9370与0.9888之间,说明数学模型具有较高的实用价值。

In order to rationally arrange WSN nodes in cornfield, signal attenuation of 2.4GHZ wireless sensor radio frequency signal was studied through the field random test based on 3 levels of planting density with transmission distance and antenna height as influencing factors, matlab was used to carry out curve fitting and analysis. Different planting density has certain influence on signal attenuation degree. Reflection and diffuse will be more serious when planting density is high and plant is intensive, and this increased the slope signal attenuation; A mathematical model was established considering the linear relationship of environmental impact factors and antenna height in RF signal propagation model. It has high practical value as the correlation between theory value and measurement value is in 0.937 and 0.9888.