船舶超短波对空电台信道分析与使用策略研究

Channel analysis and operation strategy of ship's ultra short wave radio to air radio

针对船舶在某海域航行中出现的通信距离无法提前判定的问题,在分析超短波传播特性的基础上,建立不同场景下的超短波无线信道模型,包括大尺度衰落的自由空间路径损耗模型、对数距离路径损耗模型和对数正态阴影路径损耗模型,该模型考虑到小尺度衰落的多普勒效应影响,并利用MATLAB软件仿真计算了各模型场景下对电台功率路径损耗的影响。在此基础上,提出计算链路预算方法,依此测算船舶超短波对空电台与飞机进行通信距离的方法以及优化通信链路预算的策略。

In order to solve the difficulty in predicting the communication distance of ships that traveling in certain sea areas and based upon the analyzed results of Ultrashort Wave’s features,different types of ultrashort waves’wireless communication models were established corresponding to different situations,including large-scale fading free space path loss model,log-distance path loss model,log-normal shadowing path loss model,as well as small-scale fading model’s Doppler principle effect.MATLAB was used to stimulate different situations and calculate different models’effect on radio station’s power path loss.Building on this base,methods of calculating link budget were brought up and methods of calculating the communication distances between ships‘ultrashort waves and airplanes’radio stations were created.Strategies of deciding link budget were improved.