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A spatial correlation model for the horizontal non-isotropic ocean ambient noise vector field
- Source :
- Journal of Low Frequency Noise, Vibration and Active Control. 36:124-137
- Publication Year :
- 2017
- Publisher :
- SAGE Publications, 2017.
-
Abstract
- The ocean ambient noise is one of interference fields of underwater acoustic channel. The design and use of any sonar system are bound to be affected by ocean ambient noise, so to research the spatial correlation characteristics of noise field is of positive significance to improving the performance of sonar system. Only wind-generated noise is considered in most existing ambient noise models. In this case, the noise field is isotropic in horizontal direction. However, due to those influencing factors, like rainfall, ships and windstorm, etc. for a real ocean environment, noise field becomes anisotropic horizontally and the spatial structure of ambient field also changes correspondingly. This paper presents a spatial correlation of the acoustic vector field of anisotropic field by introducing Von Mises probability distribution to describe horizontal directivity. Closed-form expressions are derived which relate the cross-correlation among the sound pressure and three orthogonal components of vibration velocity, besides, the influence of the non-uniformity of noise field on the correlation characteristics of noise vector field was analysed. The model presented in this paper can provide theoretical guidance for the design and application of vector sensors array. Furthermore, the achievement could be applied to front extraction, Green’s function extraction, inversion for ocean bottom parameters, and so on.
- Subjects :
- Spatial correlation
Acoustics and Ultrasonics
Mechanical Engineering
Acoustics
Ambient noise level
Isotropy
Building and Construction
01 natural sciences
03 medical and health sciences
0302 clinical medicine
Geophysics
Interference (communication)
Mechanics of Materials
0103 physical sciences
von Mises distribution
Vector field
Underwater
030223 otorhinolaryngology
010301 acoustics
Physics::Atmospheric and Oceanic Physics
Geology
Civil and Structural Engineering
Communication channel
Subjects
Details
- ISSN :
- 20484046 and 14613484
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Journal of Low Frequency Noise, Vibration and Active Control
- Accession number :
- edsair.doi...........fa848a521f6b1c2c5dfcf043aa9ca8d6