Method and apparatus for surveying positions of mooring lines

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding

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G01S 1542

Patent

active

046100075

ABSTRACT:
Method and apparatus for surveying positions of mooring lines extending between a moored structure and anchors in the water bottom comprising a rotatable submarine transducer assembly including acoustic pulse transmitting means and an array of acoustic receivers, a support for locating the transducer assembly at a predetermined level above the water bottom and actuator means for rotating the assembly about a vertical axis relative to the support. During operation the transmitting means produces a beam of acoustic pulses. Pulse reflections originating from mooring line sections that are successively scanned by the beam are received by the acoustic receivers, and the position of each scanned mooring line section is calculated by a processor unit on the basis of the time interval at which the pulses are received after transmission.

REFERENCES:
patent: 2418846 (1947-04-01), Meacham
patent: 3400363 (1968-09-01), Silverman
patent: 3744013 (1973-07-01), Lapetina
patent: 3781775 (1973-12-01), Malloy et al.
patent: 3786404 (1974-01-01), Ewing et al.
patent: 3810081 (1974-05-01), Rininger
Backus et al., Deep Sea Research, vol. 4, 1956, pp. 237-241.

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