發(fā)布時間：2018-12-12 22:42

【摘要】：水下無線傳感器網(wǎng)絡(luò)集水聲通信技術(shù)、傳感器技術(shù)和網(wǎng)絡(luò)技術(shù)于一身，在海洋環(huán)境探測領(lǐng)域具有極好的發(fā)展前景。但由于水聲信道噪聲高，傳播速率低，衰減大等特點，使得在研究水下無線傳感器網(wǎng)絡(luò)過程中，困難比較多，一些已經(jīng)成熟的陸上網(wǎng)絡(luò)協(xié)議不能馬上拿來應(yīng)用于水下環(huán)境，需要對其進行研究修改，這對研究水下無線傳感器網(wǎng)絡(luò)提出了不小的挑戰(zhàn)，并且大多數(shù)研究成果仍處于網(wǎng)絡(luò)驗證階段。因此，如何將水下無線傳感器網(wǎng)絡(luò)與AUV更好的結(jié)合在一起，利用傳感器網(wǎng)絡(luò)實現(xiàn)一定規(guī)模的AUV自組織通信，目前還缺乏有效的技術(shù)手段。 本文研究了基于水下無線傳感器網(wǎng)絡(luò)的AUV自組網(wǎng)所涉及的一些關(guān)鍵技術(shù)和內(nèi)容。提出了一種AUV自組網(wǎng)通信系統(tǒng)的合理解決方案，并對系統(tǒng)框架中的硬件平臺、操作系統(tǒng)、協(xié)議棧和套接字接口部分分別進行了說明。系統(tǒng)研究了AUV自組網(wǎng)中MAC層協(xié)議，先是對MAC層中的基本知識和相關(guān)概念做了一個綜述，然后對現(xiàn)在正在研究的一些MAC層協(xié)議做了詳細的介紹，并且使用Aqua-sim水下網(wǎng)絡(luò)仿真軟件對部分協(xié)議做了仿真分析。 研究802.11DCF協(xié)議的過程中，在水下環(huán)境使用該協(xié)議時，不能非常精確的測定NAV（網(wǎng)絡(luò)分配向量）的值，導致節(jié)點在競爭信道資源過程中產(chǎn)生了多余的時延，給網(wǎng)絡(luò)性能帶來了影響。為了獲得更好的網(wǎng)絡(luò)性能，，采用基于節(jié)點位置動態(tài)獲得NAV值的方法，使得節(jié)點接入信道的過程更符合水下環(huán)境，提高了網(wǎng)絡(luò)通信性能。
[Abstract]:Underwater wireless sensor networks (WSNs) have a promising future in the field of marine environmental detection because of their combination of underwater acoustic communication technology, sensor technology and network technology. However, due to the characteristics of high noise, low propagation rate and large attenuation of underwater acoustic channel, it is difficult to study underwater wireless sensor networks. Some mature terrestrial network protocols can not be applied to underwater environment immediately. It needs to be modified, which poses a great challenge to the research of underwater wireless sensor networks, and most of the research results are still in the network verification stage. Therefore, how to better combine underwater wireless sensor network with AUV to realize AUV self-organization communication on a certain scale is still lack of effective technical means. In this paper, some key technologies and contents of AUV ad hoc networks based on underwater wireless sensor networks are studied. A reasonable solution of AUV ad hoc network communication system is presented, and the hardware platform, operating system, protocol stack and socket interface in the system framework are explained respectively. In this paper, the MAC layer protocol in AUV Ad Hoc network is systematically studied. Firstly, the basic knowledge and related concepts in MAC layer are summarized, and then some MAC layer protocols which are being studied are introduced in detail. And some protocols are simulated and analyzed by Aqua-sim underwater network simulation software. In the process of studying 802.11DCF protocol, when the protocol is used in underwater environment, the value of NAV (Network assignment Vector) can not be measured accurately, which leads to the redundant delay in the process of competing for channel resources. Has brought the influence to the network performance. In order to obtain better network performance, the method of dynamically obtaining NAV value based on node location is adopted, which makes the process of node access to the channel more suitable for underwater environment and improves the network communication performance.
【學位授予單位】：中國海洋大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP212.9;TN929.5

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