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北京邮电学院二系
Published:1986
移动端阅览
[1]连汉雄.超高频侧面波在森林中的损耗(英文)[J].电子学报,1986(05):12-20.
Lian Han-xiong. UHF Lateral Wave Loss in Forests Modeled by Four-Layered Media[J]. Acta Electronica Sinica, 1986, (5): 12-20.
本文考察了超高频(200~2000MHz)电磁波在森林中的传播问题。其中
发射偶极子和接收偶极子都在森林之中。在超高频段
树干、树枝、树叶的散射起着重要作用。这时
森林应被看成是离散的、随机的、各向异性的媒质
而在其中传播的无线电波应为平均场分量与起伏分量之和。就平均场分量而言
森林模型可以表示成四层媒质
其中用介于空间与大地间的两层各向异性媒质代表树干和树叶
以便计算其中的直接波、反射波和侧面波。计算表明
在超高频段
侧面波仍是主波。理论计算与现有实验数据有着良好的吻合。
The propagation of electromagnetic waves in forest enviroments at UHF (200 MHz-2000MHz) is examined for the case where both transmitting and receiving dipoles are situated within the vegetation. At UHF
the forest must be considered to be a discrete random anisotropic medium and the radiowave propagating within this medium may be represented as the sum of a mean field component and a fluctuating component. For the mean field component
the forest model is represented as a four-layered medium with two anisotropic slabs be tween the air and the ground to represent the tree trunks and foliage for calculating the direct wave
reflected wave and lateral wave. Numerical results reveal that the lateral wave is the dominant wave at UHF and the theoretical results are in good agreement with the available experimental data.
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