| 利用矢量海洋环境噪声提取声场格林函数 |
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| 引用本文： | 周建波,朴胜春,刘亚琴,张海刚,屈科,李晓曼,张明辉.利用矢量海洋环境噪声提取声场格林函数[J].声学学报,2019,44(3):337-344. |
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| 作者姓名： | 周建波 朴胜春 刘亚琴 张海刚 屈科 李晓曼 张明辉 |
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| 作者单位： | 1. 西北工业大学 航海学院 西安 710000; |
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| 基金项目： | 博士后基金项目(W016330)资助国家自然科学基金面上项目(51679204)国防基础科研计划项目(JCKY2016607C009) |
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| 摘 要： | 考虑到矢量水听器在垂直方向上具有8字形指向性,能够有效抑制远方非平稳噪声源的干扰,提出了一种矢量环境噪声相关函数(NCF)提取声场时域格林函数(TDGF)的方法。基于简正波理论建立了声压和垂直振速垂直相关性模型。在此基础上,给出了声压和垂直振速相关函数提取声场纵向格林函数的过程.数值仿真对比和实验数据分析表明,相对于声压提取方法,垂直振速提取方法能够有效消除直达波前出现的亮纹与亮区干扰。此外,对于同等时间长度噪声序列,声压提取方法只提取到直达波路径,而垂直振速提取方法还提取到了我们更为关心的海底反射路径。利用直达波与海底反射波到达时延差估计的海深与实测海深吻合较好。
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| 关 键 词： | 海洋环境噪声 矢量水听器 格林函数 提取 声场 垂直方向 实验数据分析 相关函数 |
| 收稿时间： | 2017-04-21 |
Acoustic Greens function extraction from vector ambient noise |
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| Affiliation: | 1. Acoustic Science and Technology Laboratory, Harbin Engineering University Harbin 150001;2. College of Marine, Northwestern Polytechnical University Xi'an 710072;3. College of Underwater Acoustic Engineering, Harbin Engineering University Harbin 150001;4. College of Electronics and Information Engineering, GuangDong Ocean University Zhanjiang 524088 |
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| Abstract: | Considering the vector hydrophone has the eight shaped directivity pattern in vertical direction, which can restrain the interference caused by distant non-stationary noise sources effectively, a method about acoustic time domain Greens function(TDGF) extraction from vector ambient noise cross-correlation function(NCF) is presented. The sound pressure and vertical velocity correlation models were built based on normal mode theory, on this basis, the longitudinal Green's functions extraction process using sound pressure and vertical velocity are given. The numerical simulations and the experimental data analysis indicated that, compared with sound pressure extraction method, the vertical velocity extraction method can effectively eliminate the bright lines and light area interference which exist in front of the direct wave. In addition, for the same length of noise time sequence, sound pressure extraction method can only extract the direct wave path, while vertical velocity extraction method can extract the bottom reflection path which we are more concerned about. The water depth estimated by time lag between direct wave and bottom reflection wave is consistent well with the measured result. |
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