| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To remove noise present in a microwave Doppler sensor and detect an object to be detected with high accuracy by a simple structure and without adding special circuitry for setting the frequency of commercial power supply. <P>SOLUTION: The Doppler sensor system includes an object decision means for determining the presence of the object by output of the frequency spectrum of a Doppler signal. The object decision means, when detecting that the magnitude of the doppler signal output is continuously a predetermined value or less, detects the frequency spectrum of the commercial power supply from the peak frequency of the frequency spectrum and determines the presence of the object with the detected frequency spectrum of the commercial power supply excluded. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
