本文選題：AIS + VHF傳播模型　； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：隨著工作在VHF信道的船舶自動(dòng)識(shí)別系統(tǒng)(AIS:Automatic Identification System)開(kāi)辟了海上數(shù)字通信的新紀(jì)元,正在研究的海上甚高頻數(shù)據(jù)交換系統(tǒng)(VDES:Very High Frequency Data Exchange System)會(huì)將海上數(shù)字通信推向另一個(gè)制高點(diǎn)。AIS和VDES都工作在VHF(Very High Frequency)頻段,為提高VHF信息傳輸?shù)目煽啃?研究各種環(huán)境下VHF信號(hào)傳播特性具有一定創(chuàng)新性和積極的現(xiàn)實(shí)意義�；诖�,本文研究了跨海大橋?qū)HF信號(hào)傳播影響的特征分析,以助于VDES系統(tǒng)的研究與開(kāi)發(fā)。本文首先設(shè)計(jì)和實(shí)現(xiàn)了 VHF信號(hào)采集與分析平臺(tái),該平臺(tái)包括硬件系統(tǒng)和軟件系統(tǒng)兩部分。其中硬件系統(tǒng)由信號(hào)發(fā)生器、八木定向天線、功率放大器、信號(hào)同步設(shè)備和USRP(通用軟件無(wú)線電外設(shè))組成,其中信號(hào)同步設(shè)備包括PRS10銣原子振蕩器和UM220導(dǎo)航/授時(shí)模塊。軟件系統(tǒng)主要包括:基于Windows的Qt開(kāi)發(fā)平臺(tái),用于對(duì)信號(hào)發(fā)生器進(jìn)行參數(shù)配置;基于Ubuntu系統(tǒng)的GUN Radio無(wú)線電開(kāi)發(fā)平臺(tái),用于接收和保存數(shù)據(jù)�；谏鲜鲂盘�(hào)采集和分析平臺(tái),本文設(shè)計(jì)了三種實(shí)際測(cè)試系統(tǒng)。具體包括:搭建驗(yàn)證平臺(tái)穩(wěn)定性實(shí)際測(cè)試系統(tǒng)、驗(yàn)證定向天線方向性實(shí)際測(cè)試系統(tǒng),跨海大橋?qū)HF信號(hào)傳播影響海上實(shí)際測(cè)試系統(tǒng)。其中,前兩個(gè)實(shí)際測(cè)試系統(tǒng)均為驗(yàn)證性測(cè)試,為實(shí)際海上測(cè)試奠定基礎(chǔ)�；趯�(shí)際海上測(cè)試采集的數(shù)據(jù),本文利用MATLAB工具對(duì)采集的數(shù)據(jù)進(jìn)行處理,基于無(wú)線電波的傳播損耗理論對(duì)數(shù)據(jù)進(jìn)行分析。研究成果給出了跨海大橋?qū)HF信號(hào)傳播影響與接收端相對(duì)于大橋位置的關(guān)系,該成果對(duì)于沿海VHF信號(hào)工作區(qū)和跨海大橋的選址設(shè)計(jì)具有一定的參考價(jià)值。本課題是國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目"基于AIS通信系統(tǒng)的船舶無(wú)線自動(dòng)定位新理論與關(guān)鍵技術(shù)研究"(61231006)的部分研究?jī)?nèi)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).
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U675.7;TN914

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