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针对利用海上蒸发波导效应的微波超视距通信,在三条不同距离跨海电路上开展了外场试验。基于测试数据,统计L、S、C和X频段超视距信道的衰落幅度、深度和速率,对比分析了蒸发波导和对流层散射信道的快衰落特性。并根据大气波导和对流层散射传播预测模型,统计比较了实测和模型预测路径传播损耗。结果表明与对流层散射信道相比,蒸发波导信道衰落幅度、衰落深度和衰落速率均较小,传播预测模型可有效的预测蒸发波导的慢衰落特性。
In view of the microwave over-the-horizon communication utilizing the evanescent waveguide effect at sea, field experiments were carried out on three different cross-sea circuits at different distances. Based on the test data, the fading amplitudes, depths and velocities of OTH channels in L, S, C and X bands were calculated, and the fast fading characteristics of evanescent waveguide and tropospheric scattering channels were compared. According to the forecasting model of atmospheric wave and tropospheric scatter propagation, the measured and model predicted path propagation losses are statistically compared. The results show that compared with the tropospheric scatter channel, the evanescent waveguide channels have a small attenuation, fading depth and fading rate. The propagation prediction model can effectively predict the slow fading characteristics of the evanescent waveguide.