悬空波导环境下AIS信号超视距传播特性分析  

Over-the-horizon propagation characteristics of AIS signal in the elevated duct

作　　者：赵慧 赵振维[1] 王红光[1] 朱庆林[1] 韩杰[1] 林乐科[1] 孙方[1] 王倩南 ZHAO Hui;ZHAO Zhenwei;WANG Hongguang;ZHU Qinglin;HAN Jie;LIN Leke;SUN Fang;WANG Qiannan(China Research Institute of Radiowave Propagation,Qingdao 266107,China)

机构地区：[1]中国电波传播研究所,青岛266107

出　　处：《电波科学学报》2024年第1期100-107,共8页Chinese Journal of Radio Science

基　　金：创新人才支持计划(A132202070);张明高院士基金项目(A392202531)。

摘　　要：大气波导可陷获无线电波信号,使其发生超视距传播现象,影响无线电系统信号传播预测和性能评估应用。本文针对由探空数据诊断的悬空波导个例,利用对流层电波传播确定性方法模拟岸-船自动识别系统(automatic identification system,AIS)传播链路,定量研究了不同悬空波导环境影响下AIS信号的超视距传播特性。结果表明:波导强度50 M单位且底高约7 m的悬空波导环境下,AIS信号发生明显超视距传播现象;波导底高约700 m且强度较大的悬空波导环境也会对AIS信号传播产生影响;相比于单一悬空波导模型,复合悬空波导(文中指两个悬空波导层结构组成)环境对AIS信号传播影响更大。本文研究成果可为大气波导监测反演、无线电系统设计、装备效应评估等应用提供重要理论参考。The atmospheric duct can trap the radio wave signal and make it spread beyond the horizon,which affects the application of radio system signal propagation prediction and performance evaluation.In this paper,the characteristics of the elevated duct are analyzed based on sounding data.The deterministic method of radio wave propagation in the troposphere is used to simulate the shore-ship automatic identification system(AIS)propagation link,and the over-the-horizon propagation characteristics of AIS signals under different elevated duct environments are quantitatively studied.The results show that the AIS signal propagates significantly beyond the line of sight in an elevated duct with a duct strength of 50 M units and a bottom height of about 7 m;the strongly elevated duct environment with a duct bottom height of more than 700 m can also affect the propagation of AIS signals;compared to a single elevated duct model,the composite elevated duct(composition of two elevated duct layer structures)environment has a greater impact on AIS signal propagation.The results can provide important theoretical reference for the application of atmospheric duct monitoring inversion,radio system design,equipment effect evaluation,etc.

关 键 词：悬空波导 超视距传播 抛物方程(PE) AIS 特性分析 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]