Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1989-03-09
1990-05-08
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
G01S 1500
Patent
active
049244485
ABSTRACT:
A bistatic system and method is disclosed for mapping a large swath of the ocean bottom on a single sweep using two survey ships traveling approximately side-by-side some distance apart on parallel courses. Each ship transmits a fan shaped sonic pulse or ping symmetrically downward about the vertical and transverse to the ship's longitudinal axis and processes the backscattered echo for depth. The forward scattered portion of this pulse or a second sonic pulse transmitted downward at an angle between the ships toward the other ship is received by the other ship and is analyzed to determine ocean bottom depths of the swath between the ships. The analyzed width of an insonified swath portion is sufficiently wide so as to overlap, at an edge, with an edge of each adjacent insonified swath portion analyzed. This partial redundancy provides a means for continuous calibration by comparing depth determinations for consistency and accuracy. Precise global navigational fixes and relative intership positional fixes are to be provided by the satellite Global Positioning System (GPS) as well as other navigational systems.
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Gaer Marvin C.
Pihulic Daniel T.
Tarcza Thomas H.
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