声速分布对浅海低频声场空间相关的影响研究
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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。
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.
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.
引文
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[5]宫在晓.浅海声信道的水平相关与声场匹配定位[J].声学技术,2003, 22(s2):95-97.GONG Zaixiao. Horizontal correlation and MFP in shallow water sound channel[J]. Technical Acoustics, 2003, 22(s2):95-97.
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[7]赵梅,胡长青.浅海倾斜海底声场空间相关性研究[J].声学技术，2010, 29(4):365-369.ZHAO Mei, HU Changqing. Study of the sound spatial correlation in shallow water with inclined seafloor[J]. Technical Acoustics,2010, 29(4):365-369.
[8]赵梅,胡长青.浅海低频声场垂直相关与海底参数反演[J].声学技术, 2010, 26(4):579-583.ZHAO Mei,HU Changqing. Sound vertical correlation and the sea-bed parameters inversion in shallow water with inclined seafloor[J]. Technical Acoustics, 2010, 29(6):112-113.
[9] RAFAELY B. Spatial-temporal correlation of a diffuse sound field[J]. J. Acoust. Soc. Am., 2000, 107(6):32-54.
[10]宋军,张刚强.浅海声场的垂直相关性及垂直阵的空间增益分析[J].声学技术, 2014, 33(5):220-223.SONG Jun, ZHANG Gangqiang. Analysis of sound field vertical corre-lation property and spatial gain of vertical array in shallow wa-ter[J]. Technical Acoustics, 2014, 33(5):220-223.
[11]季桂花,李整林.南海线性内波条件下的匹配场时间相关长度[J].声学学报, 2011, 36(1):1-7.JI Guihua, LI Zhenglin. The coherence-time of matched-field processing with the presence of the linear internal waves in the South China Sea[J]. Acta Acustica, 2011, 36(1):1-7.
[12]邵炫,孙超.陆架斜坡海域信号水平纵向相关特性实验研究[J].中国科学:物理学力学天文学, 2016, 46(9):1-4.SHAO Xuan, SUN Chao. Experimental study on horizontal longitudinal correlation of the signal at continental slope area[J].Sin-Phys Mech Astron, 2016, 46(9):1-4.
[13] COLLINS M D. User’s guide for RAM versions 1.0 and 1.0p[J].Naval Research Laborator.
[14]陈勃,赵梅, KLUSEK Z,等.一种简单的浅海环境噪声场垂直相关模型[J].声学技术, 2015, 34(6):127-130.CHEN Bo, ZHAO Mei, KLUSEK Z, et al. A simple model of vertical coherence of ambient noise in shallow water[J]. Technical Acoustics, 2015, 34(6):127-130.
[2] WANG Q, ZHANG R H. Sound spatial correlations in shallow water[J]. J. Acoust. Soc. Am., 1992, 92(2):932-938.
[3] GALKIN O P, POPOV R Y, SEMENOV Y V, et al. Spatial correlation of the sound field in an ocean shelf zone[J]. Acoustical Physics, 2011, 47(5):534-539.
[4]苏晓星,李风华,简水生.浅海低频声场的水平纵向相关性[J].声学技术, 2007, 26(4):579-583.SU Xiaoxing, LI Fenghua, JIAN Shuisheng. Horizontal-longitudinal correlations of low-frequency acoustic field in shallow water[J].Technical Acoustics, 2007, 26(4):579-583.
[5]宫在晓.浅海声信道的水平相关与声场匹配定位[J].声学技术,2003, 22(s2):95-97.GONG Zaixiao. Horizontal correlation and MFP in shallow water sound channel[J]. Technical Acoustics, 2003, 22(s2):95-97.
[6]邵炫,孙超,李明杨.基于WARPING变换的宽带目标检测[C]//2014年中国声学学会全国声学学术会议论文, 2014.
[7]赵梅,胡长青.浅海倾斜海底声场空间相关性研究[J].声学技术，2010, 29(4):365-369.ZHAO Mei, HU Changqing. Study of the sound spatial correlation in shallow water with inclined seafloor[J]. Technical Acoustics,2010, 29(4):365-369.
[8]赵梅,胡长青.浅海低频声场垂直相关与海底参数反演[J].声学技术, 2010, 26(4):579-583.ZHAO Mei,HU Changqing. Sound vertical correlation and the sea-bed parameters inversion in shallow water with inclined seafloor[J]. Technical Acoustics, 2010, 29(6):112-113.
[9] RAFAELY B. Spatial-temporal correlation of a diffuse sound field[J]. J. Acoust. Soc. Am., 2000, 107(6):32-54.
[10]宋军,张刚强.浅海声场的垂直相关性及垂直阵的空间增益分析[J].声学技术, 2014, 33(5):220-223.SONG Jun, ZHANG Gangqiang. Analysis of sound field vertical corre-lation property and spatial gain of vertical array in shallow wa-ter[J]. Technical Acoustics, 2014, 33(5):220-223.
[11]季桂花,李整林.南海线性内波条件下的匹配场时间相关长度[J].声学学报, 2011, 36(1):1-7.JI Guihua, LI Zhenglin. The coherence-time of matched-field processing with the presence of the linear internal waves in the South China Sea[J]. Acta Acustica, 2011, 36(1):1-7.
[12]邵炫,孙超.陆架斜坡海域信号水平纵向相关特性实验研究[J].中国科学:物理学力学天文学, 2016, 46(9):1-4.SHAO Xuan, SUN Chao. Experimental study on horizontal longitudinal correlation of the signal at continental slope area[J].Sin-Phys Mech Astron, 2016, 46(9):1-4.
[13] COLLINS M D. User’s guide for RAM versions 1.0 and 1.0p[J].Naval Research Laborator.
[14]陈勃,赵梅, KLUSEK Z,等.一种简单的浅海环境噪声场垂直相关模型[J].声学技术, 2015, 34(6):127-130.CHEN Bo, ZHAO Mei, KLUSEK Z, et al. A simple model of vertical coherence of ambient noise in shallow water[J]. Technical Acoustics, 2015, 34(6):127-130.