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Signaling Through Scattered Vegetation: Empirical Loss Modeling for Low Elevation Angle Satellite Paths Obstructed by Isolated Thin Trees

机译:通过分散的植被发出信号:孤立的薄树遮挡的低仰角卫星路径的经验损失建模

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We propose a simple model to characterize the attenuation due to the isolated density of thin trees in an air-to-ground (satellite-to-mobile or helicopter-to-mobile) communication channel. We analyzed the effect of the mobile receiver displacement, moving from far to near the tree along the direct ray path direction for different species of trees at X band (8-12 GHz) and Ku band (12-18 GHz) frequencies. Apart from a free-space region, we have identified two different scattering zones: a diffuse scattering-dominant region around the tree trunk, within which the signal level is modeled according to a statistical distribution function; and a zone where the diffraction on the tree crown prevails, modeled considering knife-edge diffraction loss with a correction of the tree height.
机译:我们提出了一个简单的模型来表征由于空对地(卫星到移动或直升机到移动)通信通道中稀疏树木的隔离密度而引起的衰减。我们分析了移动接收器位移的影响,该位移对于X波段(8-12 GHz)和Ku波段(12-18 GHz)频率的不同树种沿直接射线路径方向从远处移动到近处。除自由空间区域外,我们还确定了两个不同的散射区域:围绕树干的漫散射主导区域,在该区域内,信号水平根据统计分布函数建模;并考虑到刀尖衍射损失并校正了树高,对树冠上的衍射占优势的区域进行了建模。

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