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Marine towed electrical resistivity survey is widely used for various purposes such as underground resources exploration, coastal engineering, archaeological detection, and UXO detection. To improve data quality and resolution, we propose enhanced in-house developed marine towed electrical resistivity survey system. First, hollow-type carbon fiber submersible electric field sensors were developed;...
Underwater object detection and tracking is of great interest for offshore defense. Recently, a new method adopting direct-current resistivity techniques was introduced to complement conventional detection method. The new detection method needs high-speed localization of underwater target object for real-time tracking. In this paper, we propose real-time localization method using grid-based template...
A new real-time underwater object detection method adopting geophysical direct-current resistivity techniques is proposed. Our final goals are real-time detection and tracking of small submarines in water depths less than 100 m, under acoustically noisy conditions. The main features of our method are as follows: 1) a detection line, several kilometers long and semipermanently buried in the seabed,...
We performed numerical and physical experiment with a marine monostatic electromagnetic (EM) survey system, which is developed primarily for exploration of seafloor mineral deposits. The system is a multi-frequency EM system housed to endure high pressure in deep sea up to 2000 m. To keep stable altitude of the system from the seafloor in rough seafloor topography condition, the system is connected...
Underwater object detection has been always issued problems. Acoustic methods are mainly used, however, detection using acoustic methods in shallow sea is difficult problem. Therefore, we carry out preliminary study adopting direct-current (DC) resistivity method, which use constant current as an active source. For the verification of our method, numerical and water tank experiments are conducted...
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