摘要
为了更好地研究蒸发波导对电磁波传播的影响,针对目前利用抛物方程模型进行电波传播预测时多将边界条件假设为平静的理想海面、且未考虑风速引起的海面粗糙状况的不足,引入了贴近实际的Miller-Brown粗糙衰减因子,进而给出了粗糙海面阻抗系数公式。结合我国海域蒸发波导实际情况,采用GPS信号参数,通过进行陷获可能性分析及传播损耗计算,仿真分析粗糙海面对电磁波在蒸发波导中传播的影响。结果表明:GPS信号可以被陷获在蒸发波导内实现超视距传输。风速越大,海面越粗糙,电磁波的超视距传输距离越小。当风速达到一定级别时,几乎可以抵消电磁波的超视距传输现象。说明粗糙海面对电磁波蒸发波导传播有较大影响。
In order to research the influence of evaporation duct on electromagnetic wave propagation, parabolic e- quation model has been used in the electromagnetic wave propagation prediction. Since most of correlational resear- ches are based on the assumption of specular impedance condition, and not consider the rough sea situation caused by wind, this paper took Miller-Brown roughness reduction factor into consideration and then provided a rough sea im- pedance coefficient formula. Combined with the actual condition of evaporation duct in Chinese sea areas, the trap- ping possibility of the GPS signals was anaiysed and its propagation loss was calculated. The simulation results show that GPS signals can be trapped in the evaporation duct over-the-horizon transmission and the greater the wind is, the more rough the sea surface is, and the smaller the distance of the over-the-horizon transmission is. When the wind speed reaches a certain level, it can almost counteract evaporation wavegnide over-the-horizon propagation phe- nomena. So it has great influence on the electromagnetic wave propagation in an evaporation duct.
出处
《计算机仿真》
CSCD
北大核心
2013年第3期196-200,共5页
Computer Simulation
关键词
蒸发波导
粗糙海面
抛物方程
全球定位信号
传输损耗
Evaporation duct
Rough sea surface
Parabolic equation
GPS signal
Propagation loss
