文章摘要
朱军,祝捍皓,屈科,郑广学,胡佳臣.声速分布对浅海低频声场空间相关的影响研究[J].声学技术,2019,38(4):376~381
声速分布对浅海低频声场空间相关的影响研究
Influences of velocity profiles on the spatial correlation of low-frequency sound field in shallow water
投稿时间:2018-03-07  修订日期:2018-04-16
DOI:10.16300/j.cnki.1000-3630.2019.04.003
中文关键词: 浅海声场  抛物方程法  声速分布  空间相关
英文关键词: shallow water sound field  parabolic equation  velocity profiles  spatial correlation
基金项目:国家自然科学基金资助项目(11704337);浙江省海洋观察-成像试验区重点实验室资助项目(00IT20170F01);浙江省教育厅科研项目(Y201738505)
作者单位E-mail
朱军 浙江海洋大学船舶与机电工程学院, 浙江舟山 316022  
祝捍皓 浙江海洋大学海洋科学与技术学院, 浙江舟山 316022  
屈科 广东海洋大学电子与信息工程学院, 广东湛江 524088 quke09@mails.ucas.ac.cn 
郑广学 浙江海洋大学海洋科学与技术学院, 浙江舟山 316022  
胡佳臣 浙江海洋大学海洋科学与技术学院, 浙江舟山 316022  
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中文摘要:
      针对浅海低频环境下水中声速分布对声场空间相关性的影响问题,利用基于抛物方程方法的RAM程序,仿真分析了声场空间相关特性在浅海不同声速梯度、不同阵元间隔下的变化规律。研究结果表明:在浅海低频环境下,正声速梯度值越大,垂直相关系数衰减越慢,水平纵向相关系数则相反;随着正声速梯度值的增大,垂直相关长度和水平纵向相关长度均呈现剧烈波动。负声速梯度值越大,垂直相关系数衰减越快,水平纵向相关系数则相反;随着负声速梯度值的增大,两类空间相关长度均缓慢波动。
英文摘要:
      Aiming at the influence of velocity profiles on the spatial correlation of low-frequency sound field in shallow water, the variation of spatial correlation under different velocity gradients and different array element intervals is simulated and analyzed by using the RAM program, which is based on the parabolic equation. Simulation results show that with the increase of positive velocity gradient, the vertical correlation coefficient decays more slowly and the horizontal-longitudinal correlation coefficient decays faster, both the vertical and the horizontal-longitudinal correlation lengths fluctuate violently; with the increase of the negative velocity gradient, the vertical correlation coefficient decays faster and the horizontal-longitudinal correlation coefficient decays more slowly, the correlation length of both types fluctuates slowly.
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