Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1994-12-22
1996-01-16
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
367 12, 367 13, G01V 138, G01V 1300, G01S 1589
Patent
active
054854326
ABSTRACT:
A method is provided for measuring the acoustic backscatter property of the floor of a body of water in which an acoustic multibeam echosounder employed on a ship is used to measure the sonic backscattered from a narrow transmission target strip on the sea floor that extends essentially vertically beneath the center of the transmitting antenna, transversely to the travel direction of the ship and which is successively exposed to sonic pulses by the transmitting apparatus. The measured backscatter is converted into sonic backscatter values allocated to receiving strips (115) of the multibeam echosounder. Calibration curves are constructed for all floor elements along the course line of the ship by echosounder measurements during a calibrating operation following a 90.degree. pivot of the echosounder around the vertical axis of the ship. The calibration curves permit an in situ calibration of the sonic backscatter values obtained during the measuring operation, eliminating the influence of the sonic beam angle on the sonic backscatter values so as to result in an unambiguous interpretation of the sonic backscatter values with respect to a definite dependency of local variations in the backscatter measure on changes in the floor sediment.
REFERENCES:
patent: 3144631 (1964-08-01), Lustig et al.
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patent: 4611313 (1986-09-01), Ziese
patent: 4939700 (1990-07-01), Breton
patent: 5033029 (1991-07-01), Jones
C. de Moustier, "Approaches To Acoustic Backscatter Measurements From The Deep Seafloor" Marine Physical Laboratory, Scripps Institution of University of Calif. San Diego La Jolla, Calif. Oceanography, Engineering, Am. Soc. of Mech. Eng., OED 11, pp. 137-143.
Aechter Burckhard
Freking Benno
Klindt Holger
Lobo Ian J.
STN Atlas Elektronik GmbH
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