| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a microwave sensor for much more accurately discriminating plants swaying in wind from such an object to be detected as an intruder, and for preventing any erroneous report as much as possible, and for increasing reliability with simple configurations. <P>SOLUTION: This microwave sensor is provided with a moving distance measuring means for measuring the variation of a distance to the detected object per unit time as a moving distance, a warning signal output control means for outputting a warning signal when the moving distance measured by the moving distance measuring means is a prescribed determination threshold and a determination threshold changing means for changing the determination threshold to a much larger value when such a status that the moving distance is the determination threshold or more continues in a first prescribed period, and when such a status that the moving distance is the determination threshold or less, and a difference between the determination threshold and the moving distance is a prescribed value or less continues in a second prescribed period. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
