摘要
海洋蒸发波导是海上超视距传播的主要机制,对于海上无线电系统的设计和运行具有重要影响.利用在我国南海开展的蒸发波导环境下的C波段微波超视距传播试验数据,对比分析了不同传播距离下的路径损耗和信号快衰落分布特征.试验结果表明:随着传播距离的增大,路径损耗逐渐接近对流层散射传播损耗,主要传播机制也逐渐从蒸发波导传播向对流层散射传播过渡;5min采样的接收信号电平快衰落分布接近为广义瑞利分布,衰落深度和衰落幅度均小于瑞利分布.所得结果对利用蒸发波导的通信系统设计具有参考价值.
The evaporation duct is an important anomalous transhorizon propagation mechanism in marine areas. It has important effects on the design and operation of marine radio system. Based on the experimental data of C-band microwave transhorizon propagation in evaporation duct environment in the South China Sea, the characteristics of path loss and fast signal fading distribution at different propagation distances are compared and analyzed. The experimental results show that with the increase of propagation distance, the propagation loss gradually approaches the tropospheric scattering propagation loss, and the main propagation mechanism gradually transits from evaporation duct to tropospheric scattering. The fast fading distribution of the received signal level sampled in 5 minutes is close to the generalized Rayleigh distribution, and the fading depth and amplitude are smaller than the Rayleigh distribution. The results are valuable for the design of over-the-horizon communication system using evaporation duct.
作者
郭相明
刘永胜
赵栋梁
林乐科
康士峰
GUO Xiangming;LIU Yongsheng;ZHAO Dongliang;LIN Leke;KANG Shifeng(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China)
出处
《电波科学学报》
EI
CSCD
北大核心
2019年第5期622-627,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金(61471329)
关键词
蒸发波导
超视距传播
衰落特性
瑞利分布
evaporation duct
transhorizon propagation
fading characteristics
Rayleigh distribution
