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题名	前视声纳关键技术研究与实现
作者	王永丰
学位类别	博士
答辩日期	2008-05-30
授予单位	中国科学院声学研究所
授予地点	声学研究所
关键词	前视声纳 波形设计 波束形成 信号处理 DSP系统
其他题名	Research and Implementation of a Forward-looking Sonar System
学位专业	信号与信息处理
中文摘要	前视声纳是目前海军所急需的保障潜艇航行安全的重要装备。本文对前视声纳设计与实现中的一些关键问题进行研究。主要内容包括前视声纳波形设计、空间信号处理以及实时信号处理系统的实现。 在波形设计方面，从参数选择、检测性能、实现成本等方面对传统主动声纳波形进行了详细的分析和论述。在此基础上，提出了一种具有多址特性、对多普勒宽容的主动波形—HFM-Costas波形。这种波形结合了Costas编码的多址特性和双曲调频波形的多普勒宽容性，接收机结构简单，检测鲁棒性好。 针对前视声纳要求较高的空间分辨率的特点，对前视声纳各种阵形设计和波束形成方案进行了比较，综合性能和工程实现因素，选择发射-接收交叉阵和发射波束垂直扫描方法作为试验系统方案。在此基础上提出了基于多址波形的多波束快速扫描方法，通过在一次脉冲周期中使用多址波形覆盖多个波束，进一步提高了前视声纳的探测效率。 具体到前视声纳系统的工程实现，本文重点讨论了干端实时信号处理机的设计与实现，提出了一种适用于主动声纳试验系统的灵活的硬件和软件结构。所提出的方案是在多个试验系统的基础上演进而来，总结了多次湖、海试的经验，对于主动声纳试验系统具有较普遍的适用性。 最后，通过试验系统测试以及水池、湖上试验，对上述设计与实现进行了初步的检验。测试证明方案可行，系统运行正常，为最终的性能试验作好了准备。
英文摘要	A forward-looking sonar (FLS) , which is imperative for Navy, is an important system to ensure the safety of submarine. This work focuses on the key issures in design and implementation of a FLS, including waveform design, spatial array signal processing, and real-time sonar signal processor development. By comparing parameters, detection performance, cost and other aspects, this work gives a detailed analysis of conventional active sonar waveforms. On this basis, a mulitaddress waveform with Doppler tolerance called HFM-Costas waveform is proposed. The new waveform inherites the multiaccess feature of Costas code and the Doppler tolerance characteristic of HFM waveform, and can be detected by using a simple, cost effective receiver which is robust in performance. Because of its high space resolution nature, array design and beamforming are the most important in FLS design. Several typical approaches are discussed and compared considering the performance and engineering factors.The cross-array scheme is chosen and a fast beam scan method is proposed. By insonifying serval different beams in one pulse period using multiaccess waveforms, this technic makes a FLS more efficient. Another important content of this work is the implementation of a real-time signal processor. Both the hardware and software are discussed and a simple but flexible solution is proposed. It evolved from several trial systems and experienced lake and sea trials and has the general applicability for active sonar trial systems. Finally, the FLS trail system is verified by system tests and trails in both pool and lake, which shows that the design and development are correct and working. The system is ready for more detailed performance tests.
语种	中文
公开日期	2011-05-07
页码	118
内容类型	学位论文
源URL	[http://159.226.59.140/handle/311008/210]
专题	声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文
推荐引用方式 GB/T 7714	王永丰. 前视声纳关键技术研究与实现[D]. 声学研究所. 中国科学院声学研究所. 2008.

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