Method and apparatus for locating a submerged marine streamer

Details Method and apparatus for locating a submerged marine streamer Method and apparatus for locating a submerged marine streamer

1985-08-06

1987-05-26

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 6, 367106, G01V 138

Patent

active

046690670

ABSTRACT:
A method is disclosed for locating the position of a marine streamer using two boats and a series of transponders in the streamer. A first pulse is electrically triggered and then generated by the transponders and by a transceiver mounted in the seismic vessel that tows the streamer. These first pulses are detected at a slave ship and the respective distances to the acoustic sources are calculated. The actual locations of the streamer transponders are calculated by trilateration when a second pulse from transponders 2-5 is detected at the slave ship. This second pulse is an acoustically triggered product of an electrically triggered initial pulse generated by a first transponder. This acoustically triggered pulse is used to determine the distance from the seismic ship to the transponder nearest the seismic ship and then to successively further transponders down the streamer length. Thereafter the positions of the transponders may be calculated.

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