【作者】 袁冬；

【导师】 杨莘元；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2007， 硕士

【摘要】 在迄今所熟知的各种能量形式中，声波在海洋中有最佳的远距离传播性能。声纳发射换能器基阵或发生源发出携带信息的声波，通过海洋到达声纳接收水听器的基阵，声纳系统对所接收的信号进行处理，从而做出判决，确定是否存在目标及目标的状态参数、目标种类，或者恢复目标发出的源信息，这就是声纳系统工作的全过程。在进行水下目标探测时，如何提高主动声纳的探测能力是我们所关注的重要方面。针对主动声纳的发射基阵提高探测能力的技术手段主要就是提高发射功率和形成尖锐指向性。当主动声纳的发射功率一定时，就必须提高基阵的发射指向性，从而提高主动声纳的探测距离，同时这一技术措施还能够抑制浅海复杂环境下的混响干扰，为后续的信号处理提供良好的准备条件。对于具有一定形状的发射基阵，提高基阵发射指向性需要计算和调节不同发射阵元发射信号的初始发射相位，使得在探测方向上预成尖锐波束，这就需要一套具有每个通道相位可调发射用多路相控信号源。论文首先简单的介绍了信号发生系统的历史、分类和关键指标；简单的介绍了本课题所研究的信号发生系统的研究方向。然后介绍了硬件系统的组成和设计方法，对PCI总线接口设计、数字信号处理器接口设计、可编程逻辑控制器接口设计、数模转换和同步电路设计分别进行了阐述和分析。本论文重点是系统的软件设计，分别介绍了DSP的Boot Loader程序设计、驱动程序设计和显示控制软件设计。特别是显示控制软件，是系统软件的主要部分。在论文最后对声纳信号的生成方法进行了叙述，着重分析了白噪声的发生和生成方法。更多还原

【Abstract】 When concerning long range transmission in the sea, sound wave has the best performance in all kinds of energy we have been familiar with. The sound wave from sonar transmit array or sources arrives sonar receiver array through the sea, then be dealt with sonar system, and the judgment can be made accordingly. As a result, we can learn whether or not there is an object, and the state parameter, the kind of object or even recover the information that transmitted by the source. That is the whole working process of the sonar system.When detecting the underwater target, what we are interested in is the ways to improve detection ability. The main technology for the transmit array of active sonar in the improvement of detection ability is whether increase transmit power or form sharp direction function. When the transmit power of active sonar is fixed on, the direction of array should be improved in order to increase the detection distance. The reverberation in shallow sea can be restrained at the same time, which provide a good condition for further signal processing. If the transmit array has a certain shape, in order to improve the direction of the array, the original transmit phase of the transmit array should be calculated and regulated, from which a sharp wave bind can be formed in the detection direction. As a result a set of multi-channel signal source that the phase of every channel can be regulated separately is needed.In this paper, the history, classification and the key guideline of waveform generator system was introduced firstly, and then the research direction of the waveform generator system was presented briefly. And then, the composing and design measure of hardware system was introduced carefully. Meanwhile, PCI Bus interface design, digital signal processing device interface design, field programming logical controller design, digital to analog exchange and synchronize circuit design were related and analyzed separately.The key of this paper was software design of waveform generator system. We introduced the Bootloader program of DSP system, Windows 2000 operating system device driver software, and Graphic User Interface (GUI) software design separately. Especially, the GUI software is the main department of software system. At last, we related the computation of sonar signal form, and analyzed the generate method of white noise signal carefully.更多还原