Patent ID: 9383428
Filing Date: 2016-07-05
CPC Classification: G01S

Claim Text:
1. A passive bearing detector comprising: a plurality of hydrophones arranged in a three-dimensional geometry configured to expose each of the plurality of hydrophones to an ambient aquatic acoustic environment; a processor electrically coupled to the plurality of hydrophones, wherein the processor is configured to determine at least one direction of arrival of an unknown broadband acoustic signal received by the plurality of hydrophones based on the phase difference of the unknown broadband acoustic signal at each of the plurality of hydrophones, wherein the processor is configured to determine the at least one direction of arrival, Θ wherein λ is the wavelength of the upper edge of the frequency band of the unknown broadband acoustic signal, φ k is the phase angle arising from a cross-correlation of the unknown broadband acoustic signal between the reference hydrophone and each one of the remaining plurality of hydrophones, and d k is the distance between each of the plurality of hydrophones.