城市小区电磁信号分布的计算预测

Calculation and Prediction of Urban District Electromagnetic Signals Distribution

为了预测计算典型城市住宅小区的电磁分布,采用有耗介质劈的UTD算法结合MOM来实现;在UTD算法中,天线被等效为一个点源处理,考虑到大范围区域的UTD射线寻迹十分耗时,所以,以天线的几何中心近似为天线的相位中心作为UTD的源进行射线寻迹,反射点和绕射点处的入射场直接由MOM计算天线近场点电磁场值得到。根据有耗媒质的菲涅尔反射系数以及本文发展采用的有耗介质劈的绕射系数求解公式,从而求得反射场和绕射场;再进行场叠加,进而可求解出任意场点的场值;最后根据此方法,计算了某高校住宅小区的电磁分布。

The electromagnetic signals distribution of typical urban residential area is calculated by using the method of lossy dielectric wedge UTD combining MOM; In UTD algorithm, the antenna is equivalent to a point source, taking into account the large areas UTD ray tracing is very time-consuming, so the geometric center of the antenna in place of the antenna phase center as a source of UTD ray tracing, the incident field at reflection and diffraction point is calculated by MOM. According to lossy medium Fresnel reflection coefficient and lossy dielectric wedge diffraction coefficient introduced by this paper, the reflected field and diffracted field can be solved. Then fields overlap, and the electric field at any point can be calculated; Finally, using this method to calculate the electromagnetic distribution of a university residential district.