| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for improving determination accuracy of a sensor device for determining presence/no presence of an object, such as a person by using a Doppler sensor. SOLUTION: The sensor device 100 includes the Doppler sensor 1, an A/D converter 2, discrete Fourier transform part 3, calculating part 4 and determining part 5. The A/D converter 2 converts a Doppler signal S1 output from the Doppler sensor 1 into a digital signal and outputs the digital signal. The discrete Fourier transform part 3 performs discrete Fourier transform of an output signal S2 of the A/D converter 2, converts the output signal S2 into the signal of a frequency domain and outputs the signal. The calculating part 4 extracts a plurality of prescribed frequency components from the output signal S3 of the discrete Fourier transform part 3, and calculates the sum total of power of a plurality of frequency components. The determining part 5 determines the presence/no presence of a detection object on the basis of the sum total of the power of the plurality of frequency components calculated by the calculating part 4. COPYRIGHT: (C)2010,JPO&INPIT
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