Acoustic flow noise cancellation using a reference hydrophone
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorEdmund Sullivan
Life of this patent
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Abstract
The present invention relates to a system and a method for substantially eliminating flow noise from the signal output of each hydrophone in a hull mounted acoustic array. The system comprises a plurality of hydrophones forming an acoustic array mounted to a hull of a marine vessel, at least one reference hydrophone mounted to the hull in a laminar region of fluid flow over the hull, and a computational device for generating an output signal for each hydrophone in the acoustic array which is substantially free of flow noise using signals inputted from the acoustic array hydrophones and the at least one reference hydrophone.
Claims16
A system for substantially eliminating flow noise from the signal output of each hydrophone in a hull mounted acoustic array which comprises:
- a plurality of hydrophones forming an acoustic array mounted to a hull of a marine vessel;
- at least one reference hydrophone mounted to said hull in a laminar region of fluid flow over said hull;
- and
- means for generating an output signal for each hydrophone in said array which is substantially free of flow noise using signals inputted from said acoustic array hydrophones and said at least one reference hydrophone.
A method for substantially eliminating flow noise from the signal output of each hydrophone in a hull mounted acoustic array, said method comprising the steps of:
- (a) mounting an acoustic array having at least one hydrophone to a hull of a marine vessel;
- (b) mounting a reference hydrophone to said hull in a laminar region of fluid flow over said hull;
- (c) inputting a signal from each said hydrophone in said array to a computation device;
- (d) inputting a signal from said reference hydrophone to said computation device;
- and
- (e) generating an output signal for each said hydrophone in said array which is substantially free of flow noise using said computation device and said inputted signals.
Dependencies are inferred from the claim text.