| 摘要 |
PROBLEM TO BE SOLVED: To accurately monitor traffic in a port with increased acoustic environmental noise due to a plurality of congested vessels. SOLUTION: Magnetic sensors (2-1 to 2-n) and field sensors (3-1 to 3-n) are disposed on a sea bottom 1, and detection signals of the magnetic sensors and the field sensors are captured to a CPU 6 of a control tower 5. Each of the detection signals of the magnetic sensors and the field sensors is divided to a DC component and an AC component, the magnetic DC component and AC component and the field DC component and AC component are analyzed, and compared with a signal pattern for each type of vessels stored in the CPU 6, whereby monitoring a passing vessel and the type of the vessel. COPYRIGHT: (C)2008,JPO&INPIT
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