S3MAG — Low magnetic noise AUV for multipurpose investigations

Application of autonomous navigation system permitted to unveil characteristic of deep and inaccessible portions of the sea widening the frontiers of near bottom geophysical investigation. A large improvement in resolution of near seafloor survey has been provided by coupling AUVs with standard marine geophysical sensors such as multibeam, high resolution seismic profiler, side scan sonar, ADCP/CTD and magnetometers. The high performance navigation capabilities of the last generation AUV able to flight at few meters above seabed, improved the accuracy in seabed mapping also providing details about its smallest features. Autonomous vehicles adoption proved to be very useful in case of magnetic investigation since the resolution of these data is strongly dependent by flight altitude. Scope of this work is to present preliminary results of S3MAG research project aimed to develop innovative AUV system equipped by a full magnetic tensor, very suitable for high precision magnetic investigation. Its low magnetic noise and the extremely easy-handling suggests to adopt the S3MAG AUV for multipurpose applications spanning from large spectrum geophysics research to more specific military/industrial needs.

[1]  Nobuhiro Isezaki,et al.  A new shipboard three-component magnetometer , 1986 .

[2]  Bob Gordon.  Degaussing: the demagnetisation of ships , 1984 .

[3]  D. Vasco.  Resolution and variance operators of gravity and gravity gradiometry , 1989 .

[4]  Environmental magneto-gradiometric marine survey in a highly anthropic noisy area , 2009 .

[5]  W. Heller,et al.  Gravity gradiometer survey errors , 1988 .

[6]  L. B. Pedersen,et al.  The gradient tensor of potential field anomalies: Some implications on data collection and data processing of maps , 1990 .

[7]  M. Tivey,et al.  Reduced crustal magnetization beneath the active sulfide mound, TAG hydrothermal field, Mid-Atlantic Ridge at 26°N , 1993 .

[8]  Kensaku Tamaki,et al.  Magnetic structure of a slow spreading ridge segment: Insights from near-bottom magnetic measurements on board a submersible , 2009 .

[9]  Jesse Pentzer,et al.  Field measurement of surface ship magnetic signature using multiple AUVs , 2009, OCEANS 2009.

[10]  Luca Cocchi,et al.  Marine Archaeogeophysical Prospection of Roman Salapia Settlement (Puglia, Italy): Detecting Ancient Harbour Remains , 2012 .

[11]  J. Bradley Nelson,et al.  Calculation of the magnetic gradient tensor from total field gradient measurements and its application to geophysical interpretation , 1988 .

[12]  M. Leybourne,et al.  Crustal Magnetization of Brothers Volcano, New Zealand, Measured by Autonomous Underwater Vehicles: Geophysical Expression of a Submarine Hydrothermal System , 2012 .

[13]  R. Wiegert.  Magnetic anomaly guidance system for mine countermeasures using autonomous underwater vehicles , 2003, Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492).