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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)...
Beamforming or spatial filtering is a technique used for achieving high directivity radiation patterns of sensor arrays. In recent decades it found its acoustic application through the development of acoustic camera and holography. This paper demonstrates the example of near-field beamforming. Eight low-cost microphones array was built and used for signal acquisition and spatial filtering is done...
The problem of narrowband CFAR (constant false alarm rate) detection of an acoustic source at an unknown location in a range-independent shallow ocean is considered. If a target is present, the received signal vector at an array of N sensors belongs to an M-dimensional subspace if N exceeds the number of propagating modes M in the ocean. A subspace detection method which utilises the knowledge of...
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