针对复杂情况下低空无线信道特性，选取近山地城镇环境视距和非视距2个场景在2.4 GHz频率下开展实地低空无线信道测量活动，分别收集1 200组信道的多径幅度值，结合统计性方法分析其对应的均方根时延扩展与莱斯因子2种小尺度衰落特性，并进行拟合。测试结果表明:2种场景的均方根时延扩展平均值分别为255 ns、1 429 ns，莱斯K因子平均值分别为3.8 dB、0.32 dB，前者莱斯K因子大于0 dB的比例为58.68%，说明该环境下莱斯信道为主；后者大于0 dB的比例为10.16%，说明该环境下瑞利信道为主；拟合的结果表明:均方根时延扩展Gamma拟合，莱斯K因子正态拟合，最后得出了对应的概率密度分布函数。
Under condition of complex conditions, this test is made, and two campus scenes are selected for field being at low-altitude wireless channel measurement with 2.4 GHz frequency. Multi-path amplitude values of 1 200 groups and 1 200 groups of channels are collected respectively. The corresponding root-mean-square time delay extension and Rice factor of the two small-scale fading characteristics are analyzed with statistical methods, and the fitting is made up. The test results show that the average root-mean-square delay spread of the two scenarios is 255 ns and 1 429 ns respectively, and the average Rice K factor is 3.8 dB and 0.32 dB respectively, and the ratio of the former Rice K factor being greater than 0 dB is 58.68%, indicating that the Rice channel is the main channel in this environment. The proportion of the latter being greater than 0 dB is 10.16%, indicating that Rayleigh channel is the main channel in this environment. The fitting results show that the root mean square delay extension is a Gamma fitting, and the Rice K factor is a normal fitting, and the probability density distribution functions of the two characteristics are obtained.
于坤灿, 向新*, 王鹏, 董鹏宇.低空无线信道小尺度衰落特性研究[J].空军工程大学学报,2023,24(5):95-101复制