热带海洋区域超短波信号衰落分布特性研究

Fading distribution characteristics of ultrashort wave signals in tropical ocean regions

为更好地掌握热带海洋区域无线电信号的衰落特性,采集了南海区域5个频率、25个位置点的电磁信号变化特性,利用Kolmogorov-Smirnov检验方法,分析了此区域无线信道的衰落分布情况,并利用最小二乘法建立了归一化幅值包络的数学模型.分析结果表明:1)热带海洋区域中,以Gauss和Rice分布为主;2)天线极化方式和频率对衰落分布类型影响不大;3)99 MHz、160 MHz、600 MHz、830 MHz、1000 MHz的衰减模型归一化信号包络幅值的均值μ和标准差σ分别为μ99=0.5311、σ99=0.2651,μ160=0.5452、σ160=0.2754,μ600=0.5238、σ600=0.2809,μ830=0.5461、σ830=0.2755,μ1000=0.5347、σ1000=0.2766.本文研究为南海区域无线信道本地化建模研究提供了技术支持.

In order to better grasp the fading characteristics of radio signals in tropical ocean regions,we collected the data of electromagnetic signal characteristics at 25 positions in the South China Sea.This data is covering the frequency of 99 MHz,160 MHz,600 MHz,830 MHz and 1000 MHz.The fading distributions of the channel in above region are evaluating through Kolmogorov-Smirnov statistical method.And the mathematical model of normalized amplitude envelope is established by least squares method.The analyzed results show that:1)there are mainly Gauss and Rice distributions in this research region;2)the polarization type and signal frequency have little impact on the fading distribution types;3)the mean of normalized amplitude in the above five frequencies are 0.5311,0.5452,0.5238,0.5461,0.5347 respectively,and the standard deviation of that is 0.2651,0.2754,0.2809,0.2755,0.2766 respectively.The above research results provide technical support for localization modeling of wireless channels in the South China Sea.