| 摘要 |
PROBLEM TO BE SOLVED: To provide a Doppler sensor device for reporting that a steady-state noise width reaches a predetermined reporting threshold.SOLUTION: A transmitting/receiving circuit 2 transmits a transmission signal to a predetermined detection range as a radio wave, and outputs a mixed signal wherein the transmission signal is mixed with a received signal acquired by receiving a radio wave reflected in the detection range. A filter 31 extracts and outputs a Doppler signal in a predetermined frequency band from the mixed signal. A determination part 32 determines whether or not a moving object exists in the detection range, based on the Doppler signal. A steady-state detection part 33 detects the steady-state noise width being a steady-state value of the width of vibration in the signal level of the Doppler signal. A reporting part 34 compares the steady-state noise width with a predetermined reporting threshold, and performs reporting when the steady-state noise width is not smaller than the reporting threshold. A user can know whether or not the steady-state noise width reaches the reporting threshold, depending on whether reporting by the reporting part 34 is made. |
