System and method for sea bed surveying

A sea bed survey system configured to be towed by a towing body and configured to detect unexploded ordnances (UXO's) and other ferromagnetic man-made objects residing on a sea bed or being buried below the sea bed, the sea bed survey system comprising at least two sensor carriers which in combination define a V-shape, each sensor carrier having a plurality of sensors disposed along its length and at least one deflector at a rear of the sensor carriers, said rear deflectors being configured to control the lateral extension between ends of the sensor carriers and the vertical position of the sensor carriers to a desired altitude above the sea bed, at least one of said sensors being a magnetic sensor which can detect a ferromagnetic signature of a present UXO or other man-made ferromagnetic object, and

• a control unit configured to receive sensor data as well as position data and to associate specific sensor data with a specific position of the sea bed.

A sea bed survey method, comprising the steps of:

• towing at least two sensor carriers by means of a towing body, said sensor carriers in combination defining a V-shape, wherein each sensor carrier has a plurality of sensors disposed along its length, and wherein at least one of said plurality of sensors is a magnetic sensor which can detect a ferromagnetic signature of a present unexploded ordnances (UXO's) or other man-made ferromagnetic object, and
• deflecting the lateral extension and the vertical position of said sensor carrier such that the lateral extension exceeds 25% of the length of sensor carrier, and the vertical position above the sea bed is less than the lateral extension of said sensor carrier;
• and wherein the vertical extension is at an altitude above the sea bed such that the magnetic sensor of the sensor carriers can detect a ferromagnetic signature of a present UXO or other man-made ferromagnetic object.

A sea bed survey method, comprising the steps of:

• providing at least two sensor carriers which in combination define a V-shape, each sensor carrier having a plurality of sensors, including at least one magnetic sensor, distributed along its length and at least one deflector configured to control the position of a back end of the sensor carrier to an altitude above the sea bed such that the at least one magnetic sensor of the sensor carrier can detect a ferromagnetic signature of a present unexploded ordnances (UXO's) or other man-made ferromagnetic objects and relative to a longitudinal axis coinciding with a survey direction,
• arranging said at least one sensor carrier such that the sensor carrier has a lateral extension relative the survey direction, and
• controlling at least one control unit for receiving sensor data as well as position data, and associating a specific sensor data with a specific position of the sea bed.