摘要
对发射机位于一个 4层树林模型中的树冠层 ,而接收机位于树干层的移动通信进行了研究。首先利用并矢格林函数推导出了问题的积分表达式 ,然后利用准静态法、鞍点法以及支点切割法得到了接收场的求和表达式。当发射机和接收机之间的水平距离增加到一定量时 ,沿空气 树冠界面的侧面波在总场中占主导地位 ,而在这之前透射波和多次反射波在总场中占主导地位。
Investigation is made into the mobile communication where the transmitter is located at the canopy layer of a four-layer forest and the receiver is located at the trunk layer.First the integral expression is derived using dyadic Green's function.Then the summation expression of the receiced electrical field is obtained by use of quasi-static approximation,saddle-point technique and branch-cut integration.When the horizontal distance between the transmitter and the recerver increases to a certain amount,the lateral waves along the upper-side air-canopy play a dominant role in the total field.When the distance is under this amount,however,the transmitted wave and multiple reflected waves are dominant.Computation results are given of the transmission attenuation under different operating frequency and different horizontal distance.
出处
《南京邮电学院学报》
2001年第1期37-42,共6页
Journal of Nanjing University of Posts and Telecommunications(Natural Science)
