Patent ID: 7933163
Filing Date: 2011-04-26
Classification: G01V

Abstract:
1. A method for controlling a marine seismic streamer and its spread, with the possibility to control individual marine seismic streamers both in shape and position in relation to other marine seismic streamers and thereby affection from crosscurrent or other dynamic forces on a towed array behind a seismic survey vessel, the method comprising the steps of: acquiring desired control parameters in Y and Z direction for the marine streamer, in which a control device provided with control members is arranged; measuring the current dynamic rotation position for the marine streamer with the control device based on: desired control parameters in only the Y direction by choosing a rotation position reference for the control device so that the rotation stability for the marine streamer with the control device is optimized; the measured current dynamic rotation position control the angular position of the control members of the control device so that the control device is provided with a rotation position which corresponds to the chosen rotation position reference; and the measured current dynamic rotation position provide a lateral and vertical displacement of the marine streamer according to the desired control parameters in the Y and Z directions, regardless of which rotation position the marine streamer with control device has about its longitudinal axis.