Non-contact motion detection apparatus
A non-contact motion detection apparatus includes at least one reception antenna, at least one transmission antenna, a voltage-controlled oscillator (VCO) and a phase lock loop (PLL). The at least one reception antenna receives a first wireless radio frequency (RF) signal. The at least one transmission antenna transmits a second wireless RF signal to an object which reflects the second wireless RF signal into the first wireless RF signal. The VCO outputs an oscillation signal to the at least one transmission antenna. The first wireless RF signal received by the at least one reception antenna is injected to the VCO. The PLL generates a control voltage to the VCO according to the oscillation signal from the VCO and a reference frequency. Controlled by the control voltage, which represents a motion information of the object, the oscillation signal of the VCO is locked to the reference frequency.
1. A non-contact motion detection apparatus, comprising:
at least one reception antenna for receiving a first wireless radio frequency (RF) signal;
at least one transmission antenna for transmitting a second wireless RF signal to an object under measurement which reflects the second wireless RF signal into the first wireless RF signal;
a voltage-controlled oscillator (VCO) coupled to the at least one reception antenna and the at least one transmission antenna, for outputting an oscillation signal to the at least one transmission antenna, wherein the first wireless RF signal received by the at least one reception antenna is injected to the VCO; and
a phase lock loop (PLL) for generating a control voltage into the VCO according to the oscillation signal generated by the VCO and a reference frequency,
wherein under controlled by the control voltage, the oscillation signal of the VCO is locked to the reference frequency and the control voltage represents a motion information of the object under measurement.
2. The non-contact motion detection apparatus according to claim 1 , wherein due to a Doppler effect generated by the motion information, a frequency of the second wireless RF signal is different that of the first wireless RF signal.
3. The non-contact motion detection apparatus according to claim 1 , further comprising:
a processing unit coupled to the VCO and the PLL for evaluating the motion information of the object under measurement according to the control voltage of the PLL.
4. The non-contact motion detection apparatus according to claim 1 , wherein the motion information of the object under measurement comprises a physiological parameter.
5. A non-contact motion detection apparatus, comprising:
at least one antenna for receiving a first wireless RF signal and transmitting a second wireless RF signal, an object under measurement reflecting the second wireless RF signal into the first wireless RF signal;
a VCO coupled to the at least one antenna for outputting an oscillation signal to the at least one antenna, wherein the first wireless RF signal received by the at least one antenna is injected to the VCO; and
a PLL for generating a control voltage to the VCO according to the oscillation signal generated by the VCO and a reference frequency,
wherein controlled by the control voltage, the oscillation signal of the VCO is locked to the reference frequency and the control voltage represents a motion information of the object under measurement.
6. The non-contact motion detection apparatus according to claim 5 , wherein due to a Doppler effect generated by the motion information, a frequency of the second wireless RF signal is different that of the first wireless RF signal.
7. The non-contact motion detection apparatus according to claim 5 , further comprising:
a processing unit coupled to the VCO and the PLL for evaluating the motion information of the object under measurement according to the control voltage of the PLL.
8. The non-contact motion detection apparatus according to claim 5 , wherein the motion information of the object under measurement comprises a physiological parameter.