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浅海水声数据传输技术研究【作者】许肖梅 【导师】许天增

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浅海水声数据传输技术研究
2Gq {&S0{)J3xz4U0Studies on Data Transmission Techniques in Shallow Water Acoustic Channels水利论文,T| R CKkb

B(I3s1{ \0作者】许肖梅 【导师】许天增水利论文3hH5K\p&y
【作者基本信息】厦门大学,,2002年,博士水利论文P ?&Z+~k$e

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【中文摘要】 浅海域无论是在军事上还是在民用上都是一个十分重要的战略区域。从海洋调查和勘探、海洋环境监测、海洋石油开采、海洋空间利用以及海上战争等诸方面来看,浅海域水声数据传输都有着特别重要的意义。水声数据传输技术是近年来发展迅速、研究相当活跃的科学技术领域之一,它的研究为解决水下信息的可靠传输提供了重要的技术保障。本论文在全面分析了浅海域水声信道的特点和实现水声通信技术的重点与难点的基础上,对浅海声信道进行了建模与通信仿真;结合海上声传输的实验研究结果,提出并实现了一种采用跳频通信的水声数据传输技术方案。论文主要进行了以下几个方面的研究工作:1. 分析了浅海声传输特点和对水声数据传输的不利影响,并较客观和全面地综述了浅海域水声通信技术的研究概况;2. 从通信技术角度对水声信道进行了仿真研究。在以射线声学为基础的仿真研究中,强调了浅海域中海底、海面的反射以及海水的声吸收对水声传输的影响;建立了浅海多途信道的模型;给出了多途信道中的脉冲响应函数,并在接收端采用检测窗的方法,弓I入自多途和互多途的概念来描述多途对水声通信的影响;3. 对厦门港浅海域声传输进行了统计特性的实验研究。 在不同传输距离上对直达...更多信号和多途信号的幅度概率密度函数和时间相关曲线进行统计特性研究,并测量分析了厦门港浅海域噪声的频谱分布特性,为设计水声抗干扰通信系统相关参数的选择提供了实验依据;4. 讨论了采用分集技术与跳频技术来解决水声通信中接收信号的幅度衰落和码间干扰。分析了采用跳频通信技术实现水声数据传输的抗多途干扰原理,并提出了一种水声跳频通信系统的设计方案;5. 针对跳频通信中最为关键的同步问题,提出了一种基于匹配滤波器的位移等待式自同步方法实现跳频同步的捕获,从理论上推导了该方法能缩短同步的捕获时间。论文还设计并实现了一种采用相关检测方法的同步头方案实现水声跳频通信中的同步捕获;6. 论文在上述理论及实验研究的基础上,最后设计并实现了一套能适用于浅海域的水声数据传输系统。该系统经过了实验室水池以及厦门港海上的现场实验。实验结果表明:在水平传输距离为6000米,数据传输速率为600bits/s时,系统的误码率约为104左右,证明了该系统具有较强的抗多途干扰能力。本文的创新之处在于:1. 对浅海水声通信信道进行了理论上的建模仿真和海上声传输统计分析的实验研究;2. 提出了一种基于匹配滤波器的位移等待式自同步方法的水声跳频通信同步技术方案;3. 论文完整地设计并实现了一套能适用于浅海的抗多途水声跳频数据传输系统,并经过了水池和厦门港的海上现场实验验证。  还原

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m4yM!hh T0【英文摘要】 Shallow water area is a very important strategic area for both military and nonmilitary purposes. People have applied the techniques of underwater acoustic communication to a variety of purposes in their use and exploration of the seas. In recent years, studies on data transmission in shallow water acoustic channels have attracted people's wide interests and got a rapid development. It provides important techniques to solve the problems of the reliability of information exchange in the seas.On the basis of general analysis of the features of shallow water acoustic channels, the key techniques and the difficult points in underwater acoustic (UWA) communications, this dissertation proposes a simple but effective model for multi-path interference, which is then used to simulate the communication system for underwater acoustics. Associated with the experimental results of the field test, we present a data transmission technique using frequency-hopping communication in underwater acoustic c...更多hannels.The main research contents in this dissertation are as follow:1. Discusses the unfavorable effects of the shallow water acoustic channels on data transmission, and objectively introduces recent certain advanced in UWA communication.2. Studies on the simulation of communication system for underwater acoustics. A UWA channel model has been developed based on the sound ray. Special emphasis has been given to the effects of the bottoms, the surfaces of the shallow sea, and the absorption of the signal caused by the shallow water. The dissertation introduces the impulse response of the shallow acoustic channel, utilizes windowing techniques to determine the effect of the signal-to corruptive multi-path signal ratio (SMR) on UWA communication in the observation window.3. Experimental studies on the statistical characteristics of the sound transmission in the shallow water in Xiamen Harbor. The dissertation gives the PDFs (probability density functions) of amplitude and time correlativity coefficient function of the direct-path signal and multi-pathinterference, measures the frequency spectra distribution of the noise in Xiamen Harbor. With these test results, we obtain correlate parameter for UWA communication system.4. Introduces the diversity methods and frequency hopping (FH) communication techniques to reduce the signal fading and eliminate inter-symbol interference (ISI) of multi-path interference. The dissertation analyses the principle of data transmission with FH communication to anti-multi-path in shallow water acoustic channels, and designs a method to implement data transmission in UWA.5. Synchronization is one of the key techniques of FH communication. A method of displacement waiting auto-synchronization with match filters is put forward to realize the synchronization of FH communication in UWA. We deduce from theory that this method can reduce the time of acquisition, then the dissertation designs and implements a method of synchronization with correlated detection for UWA FH communication.6. Based on basic research and experiments, a data transmission system in shallow water acoustic channels is designed and the field test is performed in Xiamen Harbor. Experimental results shows: a data rates of 600bits/s with the bit error rates on the order of 10"4 was demonstrated at distance 6000m in the shallow water channel of Xiamen harbor.The innovation of this dissertation is that:1. Both the channel model simulation and experimental study on the statistics characteristics of data transmission in shallow water channels are been obtained in this dissertation.2. The dissertation put forwards a method of displacement waiting auto-synchronization with match filters for UWA communication.3. The dissertation designs and implements the system of data transmission with FH communication in underwater seas, which is performed in field test in Xiamen Harbor.  还原水利论文'm2Y+kx]m

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【中文关键词】 浅海声信道; 数据传输; 多途干扰; 信道模型; 跳频通信; 同步技术水利论文;j&W'~-b4GyL3w
【英文关键词】 shallow water acoustic channels; data transmission; multi-path interference; channel model; FH communication; synchronization technique
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