Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1987-06-05
1989-02-28
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
367 7, G01S 966
Patent
active
048092410
ABSTRACT:
A method and an apparatus for determining the transit time of echoes triggered by exposure of the bottom of a body of water to sonic pulses, in order to improve the echo detection in a received signal intercepted via at least one receiving lobe, particularly for mapping the surface profile of a sea bed. A temporal echo expectation window is opened up on either side of an echo expectation time, the temporal length of the window being dimensioned greater than a maximum echo length to be expected on the basis of an assumed maximum slope of the sea bed and/or a reception angle of the receiving lobe deviating from the vertical. The center of gravity integral is formed from the received signal defined by the echo expectation window, and the time component of the center of gravity is defined as the echo transit time. The echo expectation time is derived from the echo propagation at a known sounding depth. To this end, an edge descriminator is provided, and the echo transit time ascertained by edge discrimination is used as the echo expectation time.
REFERENCES:
patent: 4207620 (1980-06-01), Morgera
Fried. Krupp Gesellschaft mit beschrankter Haftung
Pihulic Daniel T.
Tarcza Thomas H.
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