反蛙人声呐系统中的信号处理技术研究
文献类型：学位论文
| 作者 | 许小芳 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-14 |
| 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 | 反蛙人声呐 波束形成 复包络提取 目标检测 探测距离 |
| 其他题名 | A Study on the Techniques of Signal Processing in |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 声呐是一种重要的电子装备，它利用声波对水下目标进行探测、定位、跟踪、识别。近年来，由于海上恐怖袭击事件频频出现，这些袭击事件不仅仅来自水面，还有来自更加隐蔽的水下，从而导致海上监视防护系统，特别是新型反蛙人声纳的深入研究和迅速发展。而无论哪种类型的声呐，波束形成系统、目标检测以及探测距离都是衡量其性能的重要指标。 本论文的任务是对反蛙人声呐系统中的信号处理技术进行研究，研究内容包括：课题的背景介绍、波束形成技术、目标检测技术、反蛙人声呐探测距离论证以及试验结果分析等。在波束形成技术的研究过程中，通过对常规波束形成方法进行讨论，即分别对时延波束形成方法、相移波束形成方法、DFT波束形成方法以及内插波束形成方法进行仿真分析，找到各种波束形成方法的优缺点及适用范围，并结合项目需要研究出一种复包络提取的波束形成方法，但由于延迟量化误差的存在，在此基础上引入内插法进行有限量的延迟控制，实验仿真表明，比起常规的波束形成方法，带内插的复包络提取波束形成方法不仅使得输入采样率和数字处理复杂度降低，而且使得波束的时延量化精度更加的准确；当信号从波束形成器输出之后，为了辨认出目标并测定其参数，本文又对输出信号的目标检测和时延估计进行了简单的介绍；最后，根据声呐方程和给定的参数对反蛙人声呐的探测距离进行了论证。 |
| 英文摘要 | Sonar is a kind of important electronic equipment, it is an acoustic equipment that can detect, orientate, track and recognize the target underwater. In recent years, since terrorist attacks which come from not only water but also more hidden underwater will never cease at sea, monitor systems especially new kinds of detection sonar are developing rapidly and studying deeply. No matter what kinds of sonar, beam forming system, target detection and detection range are important indication to evaluating the performance of sonar. Some techniques of signal processing in frogman detection sonar are studied in this paper; the contents include the background of the project, techniques of beam forming, target detection, evaluation of the detection range and experiment data analysis. During the study of beam forming technology, the paper gives the simulation of conventional beam forming such as time-delay beam forming, phase-shift beam forming, DFT beam forming and interpolate beam forming, the advantages and disadvantages and applicable range of those beam forming methods can be obtained by analyzing them. A new beam forming method by extraction of complex envelope will be putted forward. Because of the error of delay quantify, it adds a limited amount of delay steering by interpolation. Comparing with conventional beam forming methods, the new beam forming method can not only reduce sampling frequency as well as the complexity of digital processing but also make the delay precision of beam forming more accurate; In order to making out the object accurately, when the signal are exported from beam former, the paper gives a simple introduction to the object detection and time delay estimation; At last, the paper gives a demonstration about the detection range of frogman sonar, which base on sonar equation and some parameters. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 68 |
| 源URL | [http://159.226.59.140/handle/311008/590]  |
| 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 | 许小芳. 反蛙人声呐系统中的信号处理技术研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
入库方式： OAI收割
来源：声学研究所
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