浅海环境宽容匹配场处理方法研究
文献类型：学位论文
| 作者 | 陈曦 |
| 学位类别 | 博士 |
| 答辩日期 | 2007-06-08 |
| 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 | 失配 宽容 匹配场处理 微扰法 |
| 其他题名 | The research of the robust matched field processing in the shallow water |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 利用匹配场处理进行声源定位是基于实际测量信号与数值预报声场信号相匹配的原理对目标距离和深度进行估计的。受海洋环境监测和预报能力的限制，海洋环境参数失配会使得匹配场处理定位性能下降。本文通过数值仿真和实验数据验证的方法研究了海洋海深、海底声速、海底吸收系数和海底密度失配时对匹配场定位的影响。利用上述的研究结果提出了环境宽容的匹配场处理方法并通过实验数据验证了方法的可行性和有效性。同时研究了如何利用微扰理论降低环境宽容匹配场处理方法的计算量，并通过实验数据进行了验证。 通过研究海洋海深、海底声速、海底吸收系数和海底密度失配对匹配场定位的影响表明：海深对匹配场定位的影响最大。一般来说，如果拷贝场计算用的海深大于实际的海深，则定位距离偏远，定位深度偏深；相反，如果拷贝场计算用的海深小于实际的海深，则定位距离偏近，定位深度偏浅。海底声速对匹配场定位的影响其次。一般来说，如果拷贝场计算用的海底声速大于实际的海底声速，则定位距离会偏近，定位深度会偏浅；相反，如果拷贝场计算用的海底声速小于实际的海底声速，则定位距离会偏远，定位深度会偏深。海底吸收系数和海底密度对定位的影响相对较小。 通过实验数据处理研究表明，环境宽容匹配场处理方法通过增加一维海深变量的搜索可以获得比原有常规二维匹配场处理更好的效果。结合微扰法进行三维匹配定位搜索是一种在计算量和定位效果之间的折衷处理方式。在相对于传统的二维匹配搜索的基础上增加了部分的计算量，但是却获得了近似于三维穷举搜索的定位效果。 |
| 英文摘要 | The source location using matched field processing (MFP) is based on the correlation of the actual data and the physical model. The ability of matched field processing passive source localization may be degraded by the mismatch of the environmental parameters. In this paper, the effect of the water depth, the sound speed in sediment, the absorption coefficient in sediment and the density in sediment mismatch are studied by the numerical simulations and the experiment data processing. Based on the research result, the method of the robust matched field processing has been proposed and verified by the experiment data processing. Further more, the perturbation analysis is used to reduce the computation burden of the robust matched field processing, which is proved effective by the experiment data processing. The effect of environmental parameters mismatch indicates that the source location is most sensitive to the water depth. In general, if the water depth is overestimated or underestimated the source will be localized farther or closer and deeper or shallower than it actually is. And the source location is secondly sensitive to the sound speed in sediment. In general, if the sound speed in sediment is overestimated or underestimated the source will be localized closer or farther and shallower or deeper than it actually is. The source location is less sensitive to the absorption coefficient in sediment and the density in sediment. With the processing of the experiment data, it is showed that the robust matched field processing can achieve better performance by the additional searching in the water depth variance than the conventional MFP. According to the computation burden and location precision, it is a suboptimal scheme to use three dimensional search of the MFP based on the perturbation analysis for the source location, which has increased some computation burden compared to the conventional MFP, but the result can be approximately to the robust matched field processing. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 93 |
| 源URL | [http://159.226.59.140/handle/311008/190]  |
| 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 | 陈曦. 浅海环境宽容匹配场处理方法研究[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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