The exact location of reflection and diffraction points is essential in order to calculate the polarization components of the reflected and diffracted fields and their trajectories . then , a vector addition of the received fields is carried out to obtain the total received field strength and , subsequently , the path loss along a predetermined route 该模型基于几何光学理论、一致性几何绕射理论和镜像理论,通过大量的反射和绕射射线轨迹得出源点至场点的多条路径,然后由矢量计算求出各场点处的路径损耗。
This text has counted the electric wave propagation path loss of street in one kind of typical rule range urban area , and reaches calculations data fairly with the measured data in the document . then calculate and analyze electric wave propagation ’ s characteristic in urban area . finally give an electric wave propagation prediction application example of column building model 本文最后计算了一种典型的规则排列得城市环境中街道得电波传播路径损耗,并与文献中得实测及计算数据进行了比较,然后进一步对矩形、圆柱型建筑物城市小区电波传播进行了分析计算。
Accordingly ray tracing model for microcells propagation prediction has become an important subject . this paper discussed the characteristic of propagation in symmetrical atmosphere on the earth , and introduced several kinds of traditional path loss propagation model in land mobile communication system , also pointed out the localization of these models based on experiential methods 本文首先讨论了在地球表面均匀大气中的无线电波传播的基本特性,介绍了陆地移动通信系统中常用的几种电波传播路径损耗经验性预测模型,并指出了这些经验性传播模型对于微蜂窝小区无线电波传播特性研究的局限性。
