Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1990-12-07
1991-12-31
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
G01S 1500
Patent
active
050776991
ABSTRACT:
Ocean bottom mapping is carried out by projecting a sonic pulse in the form f a fan-shaped beam from a vessel toward the ocean floor, receiving echoes by an array of sonic detectors extending athwartship, repeatedly taking instantaneous, simultaneous, snapshot-like samples of all of the detectors in the array, and, by means of a digital computer, applying a beam-forming transform, such as a Fast Fourier Transform, to the samples, thereby producing a spectrum of amplitudes versus angles. The directions of the floor areas from which the snapshot data emanate are determined from refinement of the peaks in the spectrum of amplitudes, and the distances of the same floor areas from the vessel are determined by the time interval between the pulse and the sample. A bottom profile is constructed from the directions and distances so determined. Two alternative techniques for refining and interpreting spectrum data are described.
REFERENCES:
patent: 4207620 (1980-06-01), Morgara
patent: 4561076 (1985-12-01), Gritzch
patent: 4939700 (1990-06-01), Breton
Ambrose John
Harned Nancy J.
Hediger Timothy B.
Labonski Paul A.
Passamante Anthony P.
Bechtel James B.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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