Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With towing
Patent
1995-05-15
1996-01-02
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With towing
367118, 367124, G01S 380
Patent
active
054815053
ABSTRACT:
A method and apparatus for detecting, processing and tracking sonar signals o provide bearing, range and depth information that locates an object in three-dimensional underwater space. An inverse beamformer utilizes signals from a towed horizontal array of hydrophones to estimate a bearing to a possible object. A matched field processor receives measured covariance matrix data based upon signals from the hydrophones and signals from a propagation model. An eight nearest neighbor peak picker provides plane wave peaks in response to output beam levels from the matched processor. A five-dimensional M of N tracker identifies peaks within the specified limit of frequency, bearing change over time, range and depth to specify an object as a target and to display its relative range and depth with respect to the array of hydrophones.
REFERENCES:
patent: 5216640 (1993-06-01), Donald et al.
Donald James B.
Nuttall Albert H.
Wilson James H.
Kasischke James M.
Lall Prithvi C.
McGowan Michael J.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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