Kongsberg Seatex As

Björn A Fossum

Arne Rinnan

Ola Erik Fjellstad

A method and control device for controlling the position of a marine seismic streamer spread and the ability for controlling individual marine seismic streamers both in shape and position relative to other marine seismic streamers and thereby counter effects from crosscurrent or other dynamic forces in a towed spread behind a seismic survey vessel. The system includes sensor means for determining information to control the streamer and a control device, including a housingmechanically and at least partly electrically connected in series between two adjacent sections of the streamer, at least three control membersprojecting from the housing, and control means adjusting the respective angular positions of the control membersso as to control the lateral and vertical position of the streamer. The rotational position of the streamerand control deviceis measured, and the measured rotational position is used to control the angular position of the control members, and thus the lateral and vertical displacement of the streamer

Method and system for controlling the position of marine seismic streamers

A method for determining the relative position between two or more objects in a marine environment, including waterways, of which at least one object can be maneuvered relative to one or more other objects. At least one interrogator is arranged on one or more of the objects and sends a radio wave signal to at least one transponder arranged on one or more of the other objects. The novel method is the use of a FMCW radar in the interrogator, the use of the transponders for including identity tags into the signals to be reflected to the interrogator, and attitude determination. A system for this determination is also described.

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Trondheim, Norway

Björn A Fossum