声学释放器通信模块的研究与设计

发布时间：2018-05-17 05:14

本文选题：声学释放器 + 扩频通信　；参考：《浙江大学》2014年硕士论文

【摘要】：海洋的形成是地球生命起源不可或缺的条件,经过亿万年积淀的海洋中蕴含着丰富的生物资源、矿藏资源和水文资源。随着科学技术的发展和陆地上资源、能源的大量消耗,蕴藏着丰富资源的海洋日益成为人类研究开发的对象,海洋高新技术发展也实现了长足飞跃。声学释放器作为水下科学仪器搜寻、救助和打捞的重要设备,在海洋科学、工程和军事领域具有广泛需求和应用。声学释放器通信模块是实现声学释放器水上、水下分机间声学通信的功能模块,研究高性能的水声通信模块对实现声学释放器的可靠性和安全性具有重要意义。第一章,首先介绍了声学释放器及其通信模块的研究背景、研究意义和重要性。然后以国内外研究文献和专利为基础,介绍了声学释放器的国内外发展现状和研究趋势。最后阐述了本文的主要研究内容。第二章,首先介绍了声学释放器的工作原理和基本工作流程,讨论了声学释放器的工作状态和失效形式,阐明声学释放器通信模块设计的重要性。接着,介绍了水声通信的基本原理和重要特性。然后,介绍了水声通信数字调制技术,描述了几种常用数字调制技术的原理和特点；并分析了它们在水声通信中的适用性,为声学释放器通信模块选择了适合的调制方法。最后,介绍了扩频通信技术,包括基本概念、特点、分类及扩频序列,并确定了声学释放器通信模块的设计方向。第三章,介绍了零相关区序列的概念与数学定义,并介绍了一种基于互补序列的零相关区序列集的构造方法。利用这种构造方法,构造了一个长度为64的零相关区序列集,对该序列集的4条零相关区序列的周期自相关特性和周期互相关特性进行分析,求解其零相关域的长度,并得到了与理论相符的结果,验证了零相关区序列作为直接序列扩频通信系统扩频码的可行性和优点。第四章,根据水声信道的特征,基于QPSK调制的直接序列扩频技术和以零相关区序列为扩频序列,对声学释放器通信模块的发送端和接收端做了理论推导并构建了通信模块模型。然后借助matlab,对设计的通信模块模型进行编程和仿真,观察其误码率情况,并将它与其它水声通信方案进行仿真比较。验证了该模型具有较低的复杂度,且具有较高的可靠性和较强的安全性。第五章,通过搭建实验,对声学释放器通信模块在水池水声信道中的收发效果进行测试。介绍了实验的准备和参数设定,对实验的载波调制、码元同步、信道估计及信噪比计算等关键处理方法做了介绍和分析。最后,通过对实验结果的分析,验证了设计的通信模块在水池水声信道中发送和接收,具有较低的误码率和较高的可靠性和安全性,表现出了优秀的性能。
[Abstract]:The formation of the ocean is an indispensable condition for the origin of life on the earth. After billions of years of accumulation, the ocean contains abundant biological resources, mineral resources and hydrological resources. With the development of science and technology, land resources and energy consumption, the ocean, which is rich in resources, has increasingly become the object of human research and development, and the development of marine high and new technology has also achieved a great leap forward. As an important equipment for searching, rescuing and salvaging underwater scientific instruments, acoustic release devices are widely needed and applied in marine science, engineering and military fields. Acoustic transmitter communication module is a functional module to realize acoustic communication between underwater and underwater extensions. It is of great significance to study the high performance underwater acoustic communication module to realize the reliability and safety of acoustic transmitter. In the first chapter, the research background, significance and importance of acoustic emitter and its communication module are introduced. Then, based on the domestic and international research literature and patents, the present situation and research trend of acoustic release devices are introduced at home and abroad. Finally, the main research contents of this paper are described. In the second chapter, the working principle and flow chart of the acoustic release device are introduced, the working state and failure form of the acoustic release device are discussed, and the importance of the design of the communication module of the acoustic release device is expounded. Then, the basic principle and important characteristics of underwater acoustic communication are introduced. Then, the digital modulation technology of underwater acoustic communication is introduced, the principle and characteristics of several commonly used digital modulation techniques are described, their applicability in underwater acoustic communication is analyzed, and the suitable modulation method is selected for the acoustic transmitter communication module. Finally, the spread spectrum communication technology is introduced, including the basic concept, characteristics, classification and spread spectrum sequence, and the design direction of the communication module of the acoustic transmitter is determined. In chapter 3, the concept and mathematical definition of zero correlation region sequence are introduced, and a construction method of zero correlation region sequence set based on complementary sequence is introduced. By using this construction method, a set of zero correlation region sequences with length 64 is constructed. The periodic autocorrelation and periodic cross-correlation characteristics of four zero correlation region sequences of the sequence set are analyzed, and the length of the zero correlation domain is solved. The results agree with the theory and verify the feasibility and advantages of the zero-correlation region sequence as the spread code of the direct sequence spread spectrum communication system. In chapter 4, according to the characteristics of underwater acoustic channel, based on the direct sequence spread spectrum technology of QPSK modulation and the zero-correlation region sequence as the spread spectrum sequence, the transmitter and receiver of the acoustic transmitter communication module are theoretically deduced and the communication module model is constructed. Then the communication module model is programmed and simulated by MATLAB, and the BER is observed and compared with other underwater acoustic communication schemes. It is verified that the model has lower complexity, higher reliability and stronger security. In chapter 5, the effect of acoustic transmitter communication module in underwater acoustic channel is tested. The preparation and parameter setting of the experiment are introduced, and the key processing methods such as carrier modulation, symbol synchronization, channel estimation and SNR calculation are introduced and analyzed. Finally, through the analysis of the experimental results, it is verified that the designed communication module has low bit error rate, high reliability and security, and shows excellent performance in the underwater acoustic channel.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB565

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