| 题名 | 合成孔戏声纳算法及实时实现研究 |
| 作者 | 刘奇勇 |
| 学位类别 | 博士 |
| 答辩日期 | 2004 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 中国科学院声学研究所 |
| 关键词 | 合成孔径声纳 运动补偿 自聚焦 PGA算法 实时成像 |
| 中文摘要 | 本文结合SAS海试样机系统，讨论了合成孔径声纳（Synthetic Aperture Sonar，简称SAS）信号处理的一些关键问题，研究内容包括SAs多子阵成像算法及其在实时信号处理系统中的实现、运动补偿、图像自聚焦等。在sAs成像算法研究方面，讨论了多接收阵成像算法，本文还讨论了源于CT的合成孔径快速逐点成像算法的原理和实现步骤，并进行仿真实验。在SAS运动补偿方面，首先讨论了基于运动测量系统的运动补偿，然后重点讨论基于回波数据运动补偿方法（DPC方法）的原理及其实现，并给出计算机仿真和水槽实验结果。在图像自聚焦方面，提出了一种基于图像分块的自聚焦方法，该算法能有效的应用于多强点目标场景的SAS图像自聚焦。通过计算机仿真和湖试数据进行了自聚焦实验验证。在SAS成像算法实现方面，提出了一种基于延时表的逐点成像算法改进实现。该算法在不降低成像质量的情况下，极大的减少了成像的运算量，能够有效应用于实时成像场合。本文给出了该算法的原理、处理步骤以及在多CPU信号处理机上的并行实现，并在PowerPC信号处理机上进行了仿真试验。最后对本文的内容进行了总结，并指出了有待进一步研究的工作。 |
| 英文摘要 | Some key problems of Synthetic Aperture Sonar (SAS) on the base of SAS sea-test system are discussed in the article, including imaging algorithm of Multi-aperture SAS and its realization on real time signal processing system, motion compensation and image autofoucs. On the part of SAS imaging algorithm, Multiple SAS imaging algorithm was discussed. Principle and procedure of a fast factorize back projection algorithm developed from CT domain were analyzed. Simulation result was shown. On the part of SAS motion compensation, motion compensation based on motion measure system was discussed. Then, motion compensation based on raw echo data(DPC method) was discussed in detail. Simulation result and flume test result were shown at last. On the part of SAS image autofocus, an improved PGA algorithm based on image patch was presented. The algorithm can be used efficiently in multiple strong targets situation. Test results of simulation test, Flume test and lake test confirmed the efficiently of the algorithm. On the part of realization of SAS imaging algorithm, an improved realize method of pix-base imaging algorithm based on index table was developed. It decreases the imaging computation while without any decrease on image quality. It can be used in real-time imaging efficiently. Principle, procedure and parallel processing on multiple CPU signal processing system were analyzed. Simulation result on PowerPC was shown. At last, the whole work of this thesis was summarized. Problems to be resolved in the future were pointed out. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 70 |
| 内容类型 | 学位论文 |
| 源URL | [http://159.226.59.140/handle/311008/858]  |
| 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 | 刘奇勇. 合成孔戏声纳算法及实时实现研究[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2004. |
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