| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve detection accuracy while suppressing an increase in the manufacturing cost.SOLUTION: In the cases when a moving body is a human body and a raindrop, the cumulative value of time of Doppler signals the signal level of which exceeds a threshold value shows a large difference. When the cumulative value of the time of detection signals output from a comparator 6 is less than an upper limit value within a reference time, a determination section 7 determines that the moving body is a human body. When the cumulative value within the reference time is the upper limit value or more, since the moving body is highly possibly a raindrop, the determination section 7 determines that the moving body is not a human body. That is, erroneous detection can be prevented without performing a high level signal processing such as high-speed Fourier conversion. Therefore, since the determination section 7 may not include any high performance hardware, the detection accuracy can be improved while suppressing an increase in the manufacturing cost.</p> |
