Kongsberg Seatex As

Ola Erik Fjellstad

Arne Rinnan

Snorre Normann Bache

Björn A Fossum

Per Christian Berntsen

Morten Breivik

Olav Magnus Berge

Jan Erik Faugstadmo

Sveinung Skjervheim

Snorre Bache

A method and system for dynamic positioning (DP) of marine instrumented cables. By means of a model predictive adaptive controller the power control output of a nominal controller is compensated and therethrough one achieve a more rapid and precise controlling of the control devices and accordingly the instrumented cables.

Method and system for dynamic positioning of instrumented cable towed in water

Method and system for high-accurate position determination of control devices arranged in connection with instrumented cables towed behind a survey vessel by at least one autonomous surface vessel provided with acoustic communication means, where the control devices are provided with acoustic elements, and where the acoustic communication means and acoustic elements are used for accurate positioning of the surface vessel above the control device.

System and method for accurate positioning of control devices for instrumented cables

Control device () for controlling the position of an instrumented cable towed in water, such as a marine seismic streamer, and/or an instrumented towed cable array (streamer array) with the possibility of controlling the individual instrumented cables both with in shape and position in relation to other instrumented cables and by that counteract cross currents and/or other dynamic forces which affect a towed array behind a seismic survey vessel, which control device () is provided with one or more acoustic means, such as acoustic transmitter/receiver elements (), arranged to or integrated in the wings (), main body () or motor and drive gear housings () of the control device for determination of position and distance.

Control device for positioning an instrumented cable towed in water

System and method for controlling an instrumented cable () towed in water, such as a marine seismic streamer and/or an instrumented towed cable array (streamer array), to which at least one instrumented cable (), control devices () are arranged to control the individual instrumented cables () both in shape and position in relation to other instrumented cables () and then counteract cross currents and/or other dynamic forces affecting a towed cable array behind a seismic survey vessel (). The wings () of the control devices () are provided with acoustic transmitter/receiver means () and electronics for acoustic ranging, and the vessel () and one or more tail buoys () are provided with acoustic transmitter/receiver means () and electronics for acoustic ranging, and is provided with instrumentation for absolute position and velocity.

System and method for controlling the position of a instrument cable towed in water

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

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Trondheim, Norway

Ola Erik Fjellstad