跨海大桥对VHF信号传播影响特征分析

发布时间：2018-06-07 17:43

本文选题：AIS + VHF传播模型　；参考：《大连海事大学》2017年硕士论文

【摘要】：随着工作在VHF信道的船舶自动识别系统(AIS:Automatic Identification System)开辟了海上数字通信的新纪元,正在研究的海上甚高频数据交换系统(VDES:Very High Frequency Data Exchange System)会将海上数字通信推向另一个制高点。AIS和VDES都工作在VHF(Very High Frequency)频段,为提高VHF信息传输的可靠性,研究各种环境下VHF信号传播特性具有一定创新性和积极的现实意义。基于此,本文研究了跨海大桥对VHF信号传播影响的特征分析,以助于VDES系统的研究与开发。本文首先设计和实现了 VHF信号采集与分析平台,该平台包括硬件系统和软件系统两部分。其中硬件系统由信号发生器、八木定向天线、功率放大器、信号同步设备和USRP(通用软件无线电外设)组成,其中信号同步设备包括PRS10铷原子振荡器和UM220导航/授时模块。软件系统主要包括:基于Windows的Qt开发平台,用于对信号发生器进行参数配置;基于Ubuntu系统的GUN Radio无线电开发平台,用于接收和保存数据。基于上述信号采集和分析平台,本文设计了三种实际测试系统。具体包括:搭建验证平台稳定性实际测试系统、验证定向天线方向性实际测试系统,跨海大桥对VHF信号传播影响海上实际测试系统。其中,前两个实际测试系统均为验证性测试,为实际海上测试奠定基础。基于实际海上测试采集的数据,本文利用MATLAB工具对采集的数据进行处理,基于无线电波的传播损耗理论对数据进行分析。研究成果给出了跨海大桥对VHF信号传播影响与接收端相对于大桥位置的关系,该成果对于沿海VHF信号工作区和跨海大桥的选址设计具有一定的参考价值。本课题是国家自然科学基金重点项目"基于AIS通信系统的船舶无线自动定位新理论与关键技术研究"(61231006)的部分研究内容。
[Abstract]:With the AIS: automatic Identification system (AIS: automatic Identification system), which works on the VHF channel, it opens up a new era of marine digital communication. The VHF data exchange system, VDS: very High Frequency data Exchange, will push the offshore digital communication to another high point. AIS and VDES will both work in the VHFVery High Frequency Frequency (VHF) band. In order to improve the reliability of VHF information transmission, The study of the propagation characteristics of VHF signals in various environments has a certain innovative and positive practical significance. Based on this, the characteristic analysis of the influence of cross-sea bridge on VHF signal propagation is studied in this paper, which is helpful to the research and development of VDES system. This paper first designs and implements a VHF signal acquisition and analysis platform, which consists of two parts: hardware system and software system. The hardware system consists of a signal generator, a directional antenna, a power amplifier, a signal synchronization device and a USRP.The signal synchronization device includes a PRS10 rubidium atomic oscillator and a UM220 navigation / timing module. The software system mainly includes: QT development platform based on Windows, which is used to configure the parameters of signal generator, and Gun Radio radio development platform based on Ubuntu system, which is used to receive and save data. Based on the above signal acquisition and analysis platform, three practical test systems are designed in this paper. The main contents are as follows: a practical testing system for the stability of the verification platform, a practical testing system for the directional antenna directivity, and a practical offshore test system for the influence of the sea crossing bridge on the propagation of VHF signal. Among them, the first two practical test systems are confirmatory tests, which lay the foundation for actual offshore testing. Based on the data collected from the actual offshore test, this paper uses MATLAB tools to process the collected data, and analyzes the data based on the theory of radio wave propagation loss. The relationship between the influence of the bridge on the VHF signal propagation and the position of the receiving end relative to the bridge is given, which has some reference value for the location design of the coastal VHF signal working area and the cross-sea bridge. This topic is a part of the research content of the National Natural Science Foundation of China's key project "New Theory and key Technology Research of ship Wireless automatic location based on AIS Communication system" (61231006).
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U675.7;TN914

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