电磁环境评价及预测算法研究与实现

ON ELECTROMAGNETIC ENVIRONMENT EVALUATION AND FORECAST ALGORITHM AND ITS IMPLEMENTATION

为提高电磁辐射环境影响评价的科学性和准确性,考虑大型辐射源附近建筑物群对电磁环境的影响编制了电磁环境预测软件。提出计算建筑物群对射线产生单纯性多次反射时反射点通用算法、单纯性多次绕射时绕射点通用算法,将混合型路径转换成单纯型绕射路径的算法。将这些算法运用于角度z缓存区改进算法中,并采用场强精确算法编制程序。用该程序分别对两个通信基站、一个电视发射塔周边环境进行预测,预测结果与实测结果之间误差小于4 d B。说明该程序可以用于电磁环境影响评价。

To improve the science and accuracy of electromagnetic radiation environmental impact assessment, and taking the influence of the building groups near large-scale electromagnetic radiation sources on electromagnetic environment into consideration, we develop this elec- tromagnetic environment forecast software. What we present are the general reflection points and diffraction points algorithms when calculating the simplex multiple reflections and diffractions generated separately by a group of buildings on the rays, and the algorithm converting the hy- brid path to the simplex diffraction path. These algorithms are used in the improved angle z-buffer algorithm, and the field strength exact algo- rithm is employed to compile the program. The program has been applied to forecasting the surrounding environment around two communica- tion base stations and a TV tower, the errors between the predicted values by the program and the measured values are less than 4 dB. These results show that the program can be used in electromagnetic environment impact assessment.