多线阵声纳信号处理关键技术研究
文献类型：学位论文
| 作者 | 王华奎 |
| 学位类别 | 博士 |
| 答辩日期 | 2007-05-31 |
| 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 | 拖曳线列声纳 多线阵 波束形成 左右舷分辨 最佳空间配置 子阵算法 |
| 其他题名 | Research on key signal processing technologies for towed multi-line array sonar |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 随着对声纳探测、定位距离要求的不断提高，充分利用水声声场结构，已经成为提高声纳性能的必经之路。由于声场是一种三维结构，因此采用多维基阵（多线阵），便成为提高拖曳线列阵声纳的合理选择。论文以多线拖曳线列阵（简称多线阵）声纳为研究对象，主要研究以下几个方面的内容： 1、研究了双线阵波束形成算法，推导了两种双线阵波束形成的指向性函数，并在信号处理机上实时实现了这两种波束形成算法。 2、给出了一种简单、可靠的双线阵阵间距失配模型，推导了阵间距失配状态下双线阵波束形成指向性函数，并深入研究了其左右舷分辨性能。 3、首次提出了双线阵子阵算法，研究表明双线阵CTA算法具有计算量小、波束窄、空间分辨性能好的优点，而且还有很好的左右舷分辨性能。 4、通过对空间任意阵方位角CRLB的研究，提出了多线阵空间方位角估计的CRLB 要达到理论上的最小值，其阵形必须满足一定的几何关系。给出了三线阵、四线阵的最佳空间配置和最佳空间配置下空间方位角的CRLB。 5、研究了多线阵性能对模型失配的敏感程度，分析了阵元位置误差对常用阵列处理算法的影响，研究了阵列流形敏感度。 6、研究了三种约束条件下的三线阵波束形成算法，从理论上论证了最优左右舷分辨条件下最佳阵增益波束形成和自适应波束形成的阵间距。 |
| 英文摘要 | Fully utilizing the underwater acoustic channel, especially the underwater acoustic configuration is the key for sonar to obtain higher orientation precision. The underwater acoustic configuration is three-dimensional, so the multi-line array becomes a reasonable choice to improve the towed sonar performance. In this thesis, discussions are focused on the towed multi-line array sonar and the main contents are as follow: 1. The beam pattern of the delay-sum and delay-subtract beamforming of dual-line array is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied. The realization of beamforming of dual-line array in hardware part and software part is discussed. 2. A mismatched model of dual-line array is given, the beam pattern of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied based on this model. 3. The subarray algorithm of twin-line array is studied. Research shows the Conventional-Then-Adaptive Algorithm (CTA) algorithm has high resolution, high port/starboard discrimination and can be implemented at little cost of computation. 4. The Cramer-Rao Lower Bound for the estimations of azimuth and elevation angles made with an arbitrary three-dimensional array of identical omnidirectional sensors is studied. The optimum space configuration for trinary-line array and quadruple-line array is shown and the CRLB for the optimum space configuration of trinary-line array and quadruple-line array is deduced. 5. The sensitivity of array is studied, and how the performance of multi-line array is sensitive to the model mismatched is discussed. 6. Trinary-line array signal processing algorithms: optimum array gain beamforming algorithm (OAGBF), optimum port/starboard discrimination beamforming algorithm (OP/SDBF) and adaptive beamforming algorithm (ABF) are discussed. When OP/SDBF and ABF have optimum port/starboard discrimination, the optimum space between the arrays of the trinary-line array is deduced . |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 122 |
| 源URL | [http://159.226.59.140/handle/311008/176]  |
| 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 | 王华奎. 多线阵声纳信号处理关键技术研究[D]. 声学研究所. 中国科学院声学研究所. 2007. |
入库方式： OAI收割
来源：声学研究所
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