中文摘要：

为解决温室中无线传感器网络的规划和部署问题，探讨作物对无线电波传播特性的影响，研究了种植青椒的温室中2．4GHz无线信号在不同方向和高度下的传播特性。通过试验实地测量了3个方向和2个高度下接收信号强度和丢包个数，并通过Matlab对试验数据进行回归分析。结果表明：不同方向和高度下，青椒中无线信道传播特性符合对数路径衰减模型，拟合相关系数在0．9007和0．9473之间；传感器节点在青椒中的不同高度决定着青椒中2．4GHz无线电波的传播特性，对无线信道传播特性的影响较为显著，而传播方向对青椒中无线信号的影响较弱。同时得到了青椒中传感器节点最宜部署在青椒冠层及以上位置，为无线传感器网络在种植青椒的温室中的节点部署提供了技术支持。

英文摘要：

In order to configure wireless sensor networks system and node deployment in greenhouse, this paper researched propagation characteristics of 2.4 GHz wireless channel at different directions and heights in greenhouse of green peppers. Received signal strength and packet loss numbers were investigated by field testing measurements at three directions and two heights. Regression analysis results showed that the radio channel propagation characteristics in different directions and heights of green peppers accorded with logarithm distance path loss model, and the fitting correlation coefficients between computational values and measurement values were between 0. 900 7 and 0. 947 3. Different heights of sensor nodes in the green peppers determined the radio wave propagation characteristics. Besides, validation results showed that it was the best to deploy the sensor nodes antennas at the top of green peppers canopy or above of it in greenhouse. This research can provide technical support for WSN application in greenhouse.