Mathematical Model for Ambient Noise in the Deep Ocean,
TRACOR INC ROCKVILLE MD
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Measurements of the ambient ocean noise for sea states greater than zero show that the noise is angular dependent. This implies that the spatial gain of a beam forming sonar is dependent on the orientation of the sonar array. There is, therefore, an optimum gain available for a given sonar system operating in a particular environment which is orientation dependent. The problem can give estimates of the ambient noise in agreement with large data set averages. This approach recognizes that the far field noise anisotropy is basically due to the surface disturbance and attempts to calculate the surface source from data as a function of frequency, sea state or wind scale and angle. However the observed noise data and its environmental conditions which are used to calculate the surface sources must be well known to insure that the source function represents the real world. Thus one can predict, quite accurately, the noise anisotropy for a particular environment if one knows the source corresponding to the surface disturbance. This source can be calculated from a completely different set of boundary conditions since the source is uniquely related to the sea state conditions only.
- Physical and Dynamic Oceanography