| 摘要 |
<p>PROBLEM TO BE SOLVED: To immediately detect an intrusion of a suspicious person within a precaution area. SOLUTION: Sensors 1-1,..., 1-n for detecting time-serial displacement signals of a body within spots based on phase or amplitude variations of received signals by emitting a prescribed frequency of radio wave to the specified spots 2-1,..., 2-n and by receiving reflected wave thereof are plurally arranged to cover a prescribed area, a recognition instrument for detecting the radio waves emitted from the sensors to be modulation-transmitted is attached to an optional portion of an authorized person comming in and out into/from the area, the time-serial displacement signals of the body within the spots and modulated signals thereof are detected by the sensors, and the suspicious person is discriminated based on the presence of the displacement signals and the modulated signals.</p> |
