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

【摘要】：VHF作為海上通信方式已有幾十年的歷史,是海上通信的重要手段,隨著AIS和VDES系統(tǒng)的推廣應(yīng)用和實(shí)施,VHF數(shù)字通信對(duì)信道模型等信號(hào)傳播特征提出了更高的要求。沿海領(lǐng)域環(huán)境復(fù)雜多樣,不同區(qū)域的VHF信號(hào)傳播特征直接影響船岸之間的通信,從而影響船舶航行安全。基于此,研究和分析沿海區(qū)域VHF信號(hào)傳播特征,無論在技術(shù)創(chuàng)新方面還是應(yīng)用實(shí)踐方面都具有積極的現(xiàn)實(shí)意義。論文首先設(shè)計(jì)實(shí)現(xiàn)了 VHF信號(hào)傳播測(cè)量平臺(tái),平臺(tái)硬件系統(tǒng)由信號(hào)發(fā)生器、信號(hào)分析儀、功率放大器、全向天線、同步實(shí)驗(yàn)箱等部分組成;其中,同步實(shí)驗(yàn)箱由銣鐘和GNSS模塊組成,用GNSS模塊給銣鐘校準(zhǔn)時(shí)間,以減小數(shù)據(jù)延時(shí)誤差;平臺(tái)軟件系統(tǒng)基于Windows下的Qt開發(fā)環(huán)境設(shè)計(jì)開發(fā),利用VISA庫和SCPI指令實(shí)現(xiàn)計(jì)算機(jī)和測(cè)量?jī)x器的遠(yuǎn)程通信、測(cè)量?jī)x器的自動(dòng)化配置、VHF信號(hào)自動(dòng)化收發(fā)保存等功能。然后,設(shè)計(jì)了基于MATLAB開發(fā)環(huán)境的沿海VHF信號(hào)傳播特征的數(shù)據(jù)處理平臺(tái)。該平臺(tái)分為兩部分,一部分基于實(shí)地測(cè)量數(shù)據(jù)計(jì)算發(fā)射機(jī)和接收機(jī)不同距離時(shí)的信道沖激響應(yīng)和功率延遲分布,計(jì)算多徑平均時(shí)延擴(kuò)展和均方根時(shí)延擴(kuò)展;另一部分基于經(jīng)典大尺度模型建立信道模型庫,將實(shí)地測(cè)量數(shù)據(jù)和各個(gè)大尺度信道模型進(jìn)行對(duì)比,計(jì)算殘差平方和與擬合優(yōu)度�；谏鲜鱿到y(tǒng)平臺(tái),針對(duì)大連星海灣大橋附近海域進(jìn)行了實(shí)地環(huán)境試驗(yàn),對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行了處理分析,分析了小尺度衰落中的多徑效應(yīng)和大尺度衰落,總結(jié)了沿海VHF信號(hào)傳播多徑特點(diǎn),對(duì)比了各個(gè)模型的殘差平方和與擬合優(yōu)度。
[Abstract]:As an offshore communication mode, VHF has been used for decades, and is an important means of maritime communication. With the popularization and application of AIS and VDES system, it has put forward higher requirements for the signal propagation characteristics such as channel model. The environment of coastal areas is complex and diverse, and the characteristics of VHF signal propagation in different regions directly affect the communication between ships and shores, thus affecting the safety of ship navigation. Based on this, the study and analysis of the characteristics of VHF signal propagation in coastal areas have positive practical significance in both technological innovation and practical application. The hardware system is composed of signal generator, signal analyzer, power amplifier, omnidirectional antenna, synchronous test box and so on. The synchronous test box is composed of rubidium clock and GNSS module. The calibration time of rubidium clock is calibrated by GNSS module to reduce the data delay error. The platform software system is designed and developed based on QT development environment under Windows. The functions of remote communication between computer and measurement instrument and automatic configuration of measurement instrument are realized by using VISA library and SCPI instruction. Then, the data processing platform of coastal VHF signal propagation characteristics based on MATLAB development environment is designed. The platform is divided into two parts. One part calculates channel impulse response and power delay distribution at different distances between transmitter and receiver based on field measurement data, and calculates multipath average delay spread and root mean square delay spread. In the other part, the channel model base is established based on the classical large-scale model, and the field measurement data are compared with each large-scale channel model to calculate the sum of squared residuals and the goodness of fit. Based on the above system platform, field environmental tests are carried out on the sea area near Dalian Xingwan Bridge. The experimental data are processed and analyzed, and the multipath effect and large-scale fading in small-scale fading are analyzed. The multipath characteristics of coastal VHF signal propagation are summarized, and the sum of residual square and the goodness of fit of each model are compared.
【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;TN011

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相關(guān)碩士學(xué)位論文 前1條

1 楊琴;沿海VHF信號(hào)傳播特征分析[D];大連海事大學(xué);2017年

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本文編號(hào)：1974873