基于DSP的水声模拟信号发射系统设计
毕业论文关键词 DSP 芯片 水声信号发射 D/A 转换单元
Title Design of the Underwater Acoustic Analog Signal Transmission System Based on DSP
Abstract Underwater acoustic technology has become more and more important in the field of military and marine activities. The rapid development of underwater navigation, communication and ocean exploration has made a higher requirement for underwater acoustic technology. With the continuous development of electronic information technology, a large number of new circuits and new devices are emerging, which makes the requirement of the underwater acoustic signal transmitter more and more high. This paper completed the design of hardware circuit and software simulation of underwater acoustic signal transmission system based on DSP，carried out the selection of the peripheral devices of the circuit and the connection with the DSP main chip，and debug the circuit system. The signal generation system hardware use TI company's DSP chip TMS320F28335 as the core of the control, which can guarantee the control of the whole signal transmitting system and the fast response capability. In the hardware design process, the minimum system circuit was designed (control circuit with DSP chip as the core, including power supply, JTAG interface, clock reset circuit, etc.), selected the high precision D/A conversion unit, and given the circuit working principle and parameter calculation .The communication between CAN bus and RS485 bus is adopted to ensure the reliability and stability of the transmission of the target signal. The whole system can stabilize the output signal, which is a practical signal generator system.
Keywords DSP chip Underwater Acoustic Signal Transmission D/A Conversion Unit
目录
1绪论.1
1.1引言...1
1.2水声技术的发展现状和趋势1
1.3TMS320F28335DSP芯片介绍...1
1.4本课题研究的主要内容2
2系统总体结构与最小系统设计4
2.1总体结构设计4
2.2处理器选型..4
2.3硬件最小系统电路7
3通信单元.14
3.1CAN总线通信...14
3.2RS485总线通信.15
4D/A转换单元.17
4.1电平转换电路...17
4.2D/A转换器选型.18
4.3D/A转换电路...18
5系统软件设计.21
5.1系统软件总体设计...21
5.2系统主程序设计.21
结论.27
致谢.28
参考文献.29
1 绪论 1．1 引言 当人类进行例如水下目标探测、导航、通讯等海洋活动时，无论是光波还是电磁波，它们在浑浊、含盐的海水中的传播衰减都非常大，在海水中的传播距离十分有限。相比而言，声波在水中的传播性能就好得多，使得水声技术在人类的海洋活动中得到广泛应用[1]。 水声技术主要用于研究声波在水下的传播、辐射与接收，用以解决与水下探测和数据信息传输有关的各种声学问题。广义上的水声技术是泛指在水中完成某项职能的相关技术问题，狭义上的水声技术可理解为水声信号采集、处理、显示技术，主要用于研究声信号在水中传播时的特性以及背景干扰（混响和噪声）的统计特性，并且在此基础上设计出最佳的时空处理方案[2]。声波为水下的数据传输提供了最好的解决方案，因此目前水下无线通信主要是通过声波传送数据信息。水声信号利用声波的机械振动，以波的形式在水中传播，是实现水下无线通信的主要方式。
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