Patent ID: 9188671
Filing Date: 2015-11-17
Classification: G01S,G08B

Abstract:
1. A moving body detector, comprising: an oscillator configured to output an oscillation signal having a prescribed frequency; a transmitter configured to transmit, to a space to be monitored, continuous energy waves of which amplitude is periodically changed according to the oscillation signal outputted from the oscillator; a receiver configured to output a receiving signal, when receiving a reflected wave generated due to reflection of the continuous energy waves by an object that exists within the space to be monitored; a phase-detector configured to mix the oscillation signal and the receiving signal to obtain a Doppler signal according to a frequency difference between the oscillation signal and the receiving signal; a detector configured to detect a moving body within the space to be monitored, by processing the Doppler signal, to output a detection signal; and a controller configured to control the oscillator, transmitter, receiver, phase-detector and detector, and alternatively switch a moving body detection mode of detecting the moving body and a malfunction detection mode of detecting presence or absence of malfunction occurrence, wherein, in the moving body detection mode, the controller is configured to control to input the oscillation signal to the transmitter and the phase-detector, and make the phase-detector output the Doppler signal according to the frequency difference between the oscillation signal and the receiving signal, and wherein, in the malfunction detection mode, the controller is configured to compare an output of the phase-detector obtained when controlling to input the oscillation signal to only the phase-detector, with an output of the phase-detector obtained when controlling to input the oscillation signal to both of the transmitter and the phase-detector, to detect the presence or absence of the malfunction occurrence.