海上VHF/UHF频段信道环境及其空时频率选择性

摘要

已有的针对海上VHF/UHF(Very High Frequency/Vltra High Frquency)频段信道环境的研究,在电波传播特性和底噪特性方面缺少试验数据支撑.本文在VHF/UHF频段上做了一系列海上通信试验,基于试验数据,分析了传统电波传播模型对海上视距、超视距、视距超视距临界等传播路径的适用性.同时本文提出了空时二维海上频率选择性信道分析方法,从空间、时间二维视角下定量描述了海上无线信道演变现象,对空时频率迁移和空时频率衰变的概念做了定义.结论可用于海上电波传播建模和异常现象分析.%The existing studies on maritime wireless channel environment at VHF/UHF(Very High Frequency/Vltra High Frquency) Bands lack experimental data in aspects of radio propagation and background noise.Therefore,we carried out a series of maritime wireless communication experiments to estimate adaptivity of the existing radio propagation models to within-the-horizon path,transhorizon path and just critical path.Moreover,we presented a method to analyse the maritime frequency-selective channel quantificationally from space-time perspective,and defined concepts of space-time frequency migration and declination.The results can be applied to maritime radio propagation modelling and abnormal phenomena analysing.