| 摘要 |
<p>PURPOSE:To prevent erroneous detection otherwise caused by movement of a magnetism detecting section in the detection of whether a moving magnetic object such as navigating ship is present or not, by invalidating a magnetic signal attributed to a change in the position of a hull magnetic detector itself on the basis of a moving signal for detecting the movement of the detector. CONSTITUTION:When a magnetic signal and a moving signal are generated from a magnetism detecting section 2 and a movement detecting section 3 of a hull magnetic detector 1 respectively, the moving signal from the movement detecting section 3 inputted into an AND circuit 6 through a 'NOT' circuit 5 works to block the passage of the magnetic signal from the magnetism detecting section 2 inputted into the AND circuit 6. As a result, the magnetic signal generated in the magnetism detecting section 2 is blocked from pass with the AND circuit 6 and excluded with a signal identification processing section 4 as a false hull magnetic signal. In short, the magnetic signal disposed invalid as such not involved in any change in a magnetic field attributed to a navigating ship or the like, thereby enabling avoiding of erroneous detection based on the movement of the hull magnetic detector itself.</p> |
