predetermined routing meaning in Chinese

预定路由选择

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。