复杂地形中的电波传播损耗预测研究

Research on Prediction of Radio-Wave Propagation Loss in Complex Terrain

复杂的地形条件是影响电波传播的主要因素之一,表现为地表结构和电磁特性的起伏及地表覆盖物对电波的反射、折射、衍射和屏蔽作用。与水面和没有植被覆盖的平坦地区相比,森林和山区的电波损耗要大得多,城市建筑物会引起电波的反射、散射和阻挡,造成严重的多径衰落。一直以来,国内外许多单位和学者对此进行了研究,提出了经验模型、确定性模型和半经验/半确定模型。采用的方法包括解析法、近似法和数值法。基于此,本文就复杂地形中的电波传播损耗预测进行了深入研究。

Complex topographic conditions are one of the main factors affecting radio-wave propagation,which is manifested in the undulation of surface structure and electromagnetic characteristics,and the reflection,refraction,diffraction and shielding effect of surface cover on radio-wave.Forests and mountainous areas have much greater radio-wave losses than water surfaces and flat areas without vegetation cover,and urban buildings cause reflection,scattering and blocking of radiowave,causing severe multipath fading.For a long time,many units and scholars at home and abroad have studied this issue and proposed empirical models,deterministic models and semi-empirical/semi-deterministic models.Based on this condition,this paper conducts an in-depth study on the prediction of radio-wave propagation loss in complex terrain.