本文關(guān)鍵詞：船載AIS信道接入?yún)f(xié)議的改進(jìn)與仿真　出處：《大連海事大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 船載自動(dòng)識(shí)別系統(tǒng) 自組織時(shí)分多址接入 時(shí)隙沖突 仿真

【摘要】：船載自動(dòng)識(shí)別系統(tǒng)(Automatic Identification System,AIS)通過(guò)自組織時(shí)分多址接入(Self-organized Time Division Multiple Access,SOTDMA)協(xié)議實(shí)現(xiàn)信道接入和設(shè)備間互相通信的功能。隨著經(jīng)濟(jì)的發(fā)展,船舶交通越來(lái)越繁忙,因而在交通流密度大的水域,會(huì)發(fā)生船載AIS發(fā)射的時(shí)隙沖突,從而造成信息發(fā)射失敗。對(duì)于岸上監(jiān)控系統(tǒng)表現(xiàn)為監(jiān)控目標(biāo)較長(zhǎng)時(shí)間不更新位置,若更新后,還會(huì)出現(xiàn)跳躍現(xiàn)象。這給航行安全和海事監(jiān)管帶來(lái)了隱患。因此,研究鏈路層AIS信道接入?yún)f(xié)議的性能,降低時(shí)隙沖突率對(duì)AIS的標(biāo)準(zhǔn)發(fā)展及實(shí)際應(yīng)用都很有必要。本文主要工作有:(1)深入分析了 AIS工作原理,重點(diǎn)探討了鏈路層的關(guān)鍵技術(shù)和AIS工作流程。之后結(jié)合AIS工作流程,對(duì)SOTDMA協(xié)議時(shí)隙沖突率分析的理論模型進(jìn)行了研究。(2)利用Visual Studio開(kāi)發(fā)工具,使用C++對(duì)AIS的SOTDMA協(xié)議進(jìn)行仿真,實(shí)現(xiàn)了船舶之間的自組織通信以及船舶發(fā)射時(shí)隙的自主預(yù)約功能。之后設(shè)置不同的船舶數(shù)量以及報(bào)文報(bào)告間隔,進(jìn)行仿真實(shí)驗(yàn),重點(diǎn)研究了 AIS的時(shí)隙沖突率性能。(3)驗(yàn)證仿真系統(tǒng)的可靠性。將不同場(chǎng)景下得到的仿真結(jié)果和理論值進(jìn)行比較,分析發(fā)現(xiàn)時(shí)隙沖突率比較接近,變化趨勢(shì)也一致。之后對(duì)真實(shí)AIS數(shù)據(jù)的時(shí)隙沖突率進(jìn)行統(tǒng)計(jì),并在水域真實(shí)場(chǎng)景中進(jìn)行仿真實(shí)驗(yàn)。通過(guò)對(duì)比,發(fā)現(xiàn)時(shí)隙沖突率結(jié)果的差值在可接受范圍內(nèi),驗(yàn)證了仿真系統(tǒng)的可靠性。(4)針對(duì)船舶密集的水域中時(shí)隙沖突率比較高的狀況,提出了一種改進(jìn)的時(shí)隙預(yù)約算法。從仿真結(jié)果可以看出,相同負(fù)載下,改進(jìn)的時(shí)隙預(yù)約算法沖突率更低。
[Abstract]:Automatic Identification System. AIS) Self-Organized Time Division Multiple Access via self-organized time-division multiple access (TDMA). SOTDMA) protocol realizes the function of channel access and communication between devices. With the development of economy, ship traffic becomes more and more busy, so it is in the waters with high traffic density. The time slot conflict of shipborne AIS launch will occur, which results in the failure of information launch. For the onshore monitoring system, the monitoring target does not update its position for a long time, if the position is updated after updating. There will also be jump phenomenon, which brings hidden trouble to navigation safety and maritime supervision. Therefore, the performance of link layer AIS channel access protocol is studied. It is necessary for the standard development and practical application of AIS to reduce the time slot collision rate. The main work of this paper is to analyze the working principle of AIS. The key technologies of link layer and AIS workflow are discussed in detail, and then combined with AIS workflow. The theoretical model of slot collision rate analysis for SOTDMA protocol is studied. (2) Visual Studio is used to develop the model. C is used to simulate the SOTDMA protocol of AIS. The self-organizing communication between the ships and the autonomous reservation function of the ship launch time slot are realized. Then the different number of ships and the report interval are set, and the simulation experiment is carried out. The reliability of the simulation system is verified by the performance of the slot collision rate of AIS. The simulation results under different scenarios are compared with the theoretical values, and it is found that the slot collision rate is close to that of the simulation system. The change trend is also consistent. Then the real AIS data slot collision rate is counted and simulated in the real water scene. Through the comparison, it is found that the difference of the slot conflict rate results is within the acceptable range. The reliability of the simulation system is verified. (4) an improved slot reservation algorithm is proposed to solve the problem of high slot collision rate in ship dense waters. From the simulation results, it can be seen that under the same load. The improved slot reservation algorithm has a lower collision rate.
【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

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 申偉剛;益曉新;詹平;;一種改進(jìn)的FAMAC協(xié)議的仿真與性能分析[J];艦船電子工程;2006年03期

2 沈明玉;閆磊;劉兵偉;;一種收方主動(dòng)的ad hoc信道接入?yún)f(xié)議研究[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年06期

3 趙寰;全厚德;關(guān)進(jìn)輝;;低速Ad Hoc網(wǎng)絡(luò)多信道接入?yún)f(xié)議研究與設(shè)計(jì)[J];儀表技術(shù);2009年09期

4 吳志玲;靳鴻;馮彥君;;基于OPNET的信道接入?yún)f(xié)議網(wǎng)絡(luò)性能研究[J];伺服控制;2012年02期

5 趙志峰,鄭少仁,仇佩亮;Ad Hoc網(wǎng)絡(luò)載波監(jiān)聽(tīng)雙信道接入?yún)f(xié)議[J];浙江大學(xué)學(xué)報(bào)(工學(xué)版);2005年04期

6 文吉;;機(jī)間數(shù)據(jù)鏈核心問(wèn)題的分析與探討[J];電訊技術(shù);2007年05期

相關(guān)碩士學(xué)位論文 前6條

1 金鳴;船載AIS信道接入?yún)f(xié)議的改進(jìn)與仿真[D];大連海事大學(xué);2017年

2 白科;一種新的Ad Hoc多信道接入?yún)f(xié)議的設(shè)計(jì)與仿真[D];電子科技大學(xué);2008年

3 陳建虎;Ad Hoc網(wǎng)絡(luò)容量和多信道接入?yún)f(xié)議研究[D];西安電子科技大學(xué);2006年

4 周明政;一種新的Ad Hoc網(wǎng)絡(luò)MAC協(xié)議的提出及實(shí)現(xiàn)[D];浙江大學(xué);2005年

5 孫晶;無(wú)線自組織網(wǎng)MAC協(xié)議的改進(jìn)與優(yōu)化[D];哈爾濱工程大學(xué);2009年

6 張南;戰(zhàn)術(shù)級(jí)指戰(zhàn)員信息網(wǎng)（WIN-T）干擾策略研究[D];西安電子科技大學(xué);2006年

，

本文編號(hào)：1372486