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Research on the Correlation of Ambient Noise Based on Acoustic Vector Hydrophone

Author: ShangHua
Tutor: HuangYiWang
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: Marine environmental noise Spatial correlation coefficient Acoustic vector field Ray theory
CLC: TB565.1
Type: Master's thesis
Year: 2009
Downloads: 138
Quote: 2
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Abstract


In recent years , research related characteristics of the marine environment noise field space has considerable depth , several noise field model space in some direction noise correlation coefficient analytic expression has also been given . These studies promote the development of a hydrophone array processing technology . The hydrophone arrays work which the gesture is not always unique , and in order to calculate the signal-to-noise ratio gain of hydrophone arrays , we must know the correlation coefficient on the noise field space in any direction . Most of the current model are only solved in a certain direction in space , there are some limitations in the practical application . This paper mainly consider two models of the homogeneous isotropic noise field and the vertical directivity interface noise field , the analysis of the spatial coherence of interface reverberation , each noise sound pressure and particle vibration velocity cross-correlation of the three orthogonal components the characteristics were studied to obtain the analytical expressions of the spatial correlation coefficient and the noise covariance matrix . Application noise field coherence properties of the analytical solution , we can easily analyze vector hydrophone output signal - to - noise ratio , and at the same time also of great significance the lineup and application of vector hydrophone arrays . Discussed a ray method is used to solve a given problem in the marine environment under the sea , seabed reflection coefficient , media sound absorption coefficient . Finally, the existing sea trial data processing , and calculated the correlation coefficient of the noise field under a number of realistic sea conditions .

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Underwater Acoustics > Underwater acoustic instruments and equipment > Underwater acoustic transducer , the hydrophone
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