| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a Doppler sensor capable of suppressing misdetections. <P>SOLUTION: The Doppler sensor includes an FFT section 22, which performs fast Fourier transform of a Doppler signal which is outputted by a transmission-reception circuit 1 and has the frequency for the difference between the frequency of a transmission signal and that of a reception signal; a signal-shaping section 23, which when a noise frequency being a frequency of which the amplitude continues to be a prescribed noise determination amplitude or higher for a prescribed noise determination time or longer is present in the output of the FFT section 22, generates and outputs a shaping signal obtained by shaping the Doppler signal so that at least the component of a removing object frequency which is the lowest of the noise frequencies be attenuated, and when the noise frequency is not present, outputs the Doppler signal, as it is, as the shaping signal; and a determination section 24, which makes determination as to whether there is a moving object in the detection range, based on the shaping signal outputted by the signal-shaping section 23. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
