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摘要随着科技发展与陆地资源的日益衰竭，各国的目光不断投向海洋资源的开采。与此同时，对水下声通信的研究也在近几年有突飞猛进的发展，取得了很多很优秀的成果。然而，由于水声信道的频带有许多因素的影响，尤其是多径干扰最为严重。传播损耗，水声信道参数，多普勒频移等都会严重影响水声信道的频带。所以在水下声通信系统中，发射电路与接收电路的稳定性就会是系统中最为重要的枢纽。本论文完成了对系统的稳定性分析，制作与调试。25463
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其次，本文中心思想是用小型扬声器作为换能器，来设计一套完整的水下无线通信系统。本文会着重以对小扬声器的选择进行详细的介绍。其次会分别对发射电路和接收电路的设计进行更为详细的介绍，其中包括元器件，芯片的选择还有单片机的选择。然后是系统中的调制与解调电路的设计，最后进行电路的调试，以显现出应有的完整小型扬声器的水下声通信系统。
关键词 水声通信 小型扬声器 发射与接收 调制与解调
毕业论文设计说明书外文摘要
Title The Design of Acoustic Communication System with Small Speaker under Water
Abstract
With the development of science and technology and the increasing exhaustion of land resources, countries continue to invest in the eyes of the exploitation of ocean resources. At the same time, the research on underwater acoustic communication has make a spurt of progress development in recent years, has made many excellent achievements. However, due to underwater acoustic channel bandwidth seriously affect by many factors, the multipath interference is very serious. The underwater .Acoustic channel parameters, transmission loss and Doppler frequency shift will seriously affect the bandwidth of underwater acoustic channel. So in the underwater acoustic communication system, transmitting and receiving circuit stability is an important hub for most will system. This paper makes a detailed analysis on the stability of the system, making and debugging.
Secondly, the central idea is to use small speakers as transducer, wireless communication system to design a complete set of water. This paper will focus on the small speaker selection were introduced and analyzed in detail the selection. Then I design the modulation and demodulation circuit of the system. The last part is circuit debugging to show the complete sound communication system with small speakers under water.
Keywords Underwater acoustic communication Small speaker Transmitting and receiving
目 次
1 引言（或绪论） 1
1.1 课题背景与研究意义 1
1.2 水声通信简介… 1
1.3 国内外的研究现状… 2
1.4 本论文研究主要内容 2
1.5 本论文结构安排 3
2 小扬声器水声换能器 4
2.1 工作原理… 4
2.2 水声换能器定义 4
2.3 小扬声器型号选择… 4
2.4 小扬声器做水下换能器参数性能指标… 5
3 系统发射电路设计 7
3.1 PWM调制电路 7
3.2 死区电路 8
3.3 D类功率放大器… 9
3.4 IR2112S功率驱动芯片 10
3.5 功率输出级IRF540电路设计 11
3.6 发射电路总体仿真设计与实物展示 12
4 系统接收电路设计 14
4.1 宽带低噪低漂移放大器… 14
4.2 LF356低通滤波器…14
4.3 AD648反相放大器 15
5 系统软件设计… 17
5.1 MSP430G2单片机简介 17
5.2 CCS的介绍与应用… 17
5.3 UART串口通信 18
5.4 MSP430G2的A/D转换… 18
6 系统硬件与软件测试… 20