海面蒸发波导信道的建模及仿真研究

Research on Channel Modeling and Simulation for Oceanic Evaporation Duct

针对海洋表面蒸发波导信道的时变、多径特性,根据海上环境下蒸发波导信道的特点及电磁波实现波导传播的必要条件,采用傅立叶分裂步进算法求解抛物线方程得出信号的传输损耗并进行功率设置,提出并建立了一个时变多径的蒸发波导信道模型,并进行了仿真。实验结果表明,提出的模型具有随机时变、多径衰落的特性,能够模拟北纬20°～25°、东经110°～115°海域中性层结条件下的蒸发波导信道,并在一定程度上为海上微波超视距通信系统的优化设计提供信道模型参考。

This paper analyzed the characteristics and necessary conditions of channel for evaporation ducts with focus on time variable and multi - path fading character. The radio wave propagation loss in the evaporation duct over the sea surface was simulated using the Fourier - Split - Step algorithm for the parabolic equation. The paper introduced and simulated a model for evaporation ducts channel which is time varying and multi - path affected. The resuits indicate that this channel model can simulate the real duct channel over seas between north latitude 20° -25 ° and east longitude 110°- 115° in neutral atmosphere stratification and provide some references for communication system over the horizon based on evaporation ducts.