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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >C band transhorizon signal characterisations in evaporation duct propagation environment over Bohai Sea of China
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C band transhorizon signal characterisations in evaporation duct propagation environment over Bohai Sea of China

机译：渤海蒸发管传播环境中的C波段超视距信号表征

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摘要

Evaporation duct is an anomalous mechanism of transhorizon propagation in marine and coastal regions. In order to better understand the characteristics of signal fading, a C band signal transhorizon propagation experiment was carried out with a 107 km path length over the Bohai Sea of China. Using an iron tower with meteorological and oceanographic (METOC) sensors at multiple altitudes, a direct diagnostic method of evaporation duct is presented. The dependence of signal strength on evaporation duct height, antenna height, and METOC parameters is analysed. The experimental results indicate that the signal strength tends to be linearly dependent on the evaporation duct height when the transmitter and receiver antennas are submerged within the duct layer. Normally, the signal strength is stronger when the relative humidity is lower. Stronger signal strength tends to occur under near-neutral or stable atmospheric conditions or when the air-sea temperature difference is higher. The results indicate that the signal strength distribution of fast fading is close to Rayleigh distribution, and the probability density of fade slope is symmetric at 0 dB/s. These results have important implications for the design of ducting communications system.
机译：蒸发管是超视距在海洋和沿海地区传播的异常机制。为了更好地理解信号衰落的特性，在中国渤海进行了C波段信号超视距传播实验，路径长度为107 km。使用在多个高度带有气象和海洋（METOC）传感器的铁塔，提出了蒸发管的直接诊断方法。分析了信号强度对蒸发管高度，天线高度和METOC参数的依赖性。实验结果表明，当发射器和接收器天线浸没在管道层中时，信号强度往往与蒸发管道高度呈线性关系。通常，相对湿度越低，信号强度越强。在接近中性或稳定的大气条件下或当海海温差较高时，往往会出现较强的信号强度。结果表明，快速衰落的信号强度分布接近瑞利分布，衰落斜率的概率密度在0 dB / s时是对称的。这些结果对管道通信系统的设计具有重要意义。

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