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This paper addresses the problem of passive wideband localization of a shallow water noise source in near-field with a horizontal array in the presence of multipath propagation. Multipath propagation gives rise to attenuated and time-delayed replicas of the original transmitted signal. The conventional beamforming approach to wideband localization involves the coherent signal-subspace method (CSM)...
Cron and Sherman[1] mentioned that noise in the ocean was a superposition of an isotropic noise field and an anisotropic noise field originating at the surface. In this paper a numerical simulation method for the isotropic noise field and the anisotropic noise field is proposed. And operation steps and operational rules of the method are described in detail. By reasonable choosing the way noise sources...
Vector sound intensity (i.e., sound-power flow per unit area) can be used to determine the direction of a sound source in water. A typical vector sound intensity array is composed of three pairs of sensors with pairs aligned along orthogonal axes. Such a typical vector sound intensity array, in our opinion, is still not convenient for engineering implementation. In this paper the four-sensor vector...
It has been an acceptable conclusion that the vector sound intensity array can estimate the direction of sound sources in high precision in an isotropic noise field, but the error in anisotropic noise field has not been systematically studied yet. The error in doa estimation caused by an anisotropic noise field is analyzed in detail here by taking the ocean surface noise field introduced by cron and...
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