Systems for detecting movement of a target

摘要

A system is disclosed for wirelessly detecting movement of a target. The system comprises a reference oscillator, a transmitter, a receiver, a demodulator, and a processor, wherein: the reference oscillator generates references frequencies for the transmitter, the receiver, and the demodulator; the transmitter generates a continuous-wave signal at a frequency based on the transmitter reference frequency and wirelessly transmits it to the target; the receiver wirelessly receives a reflected signal from the target having a phase angle corresponding to movement of the target and converts the reflected signal into an intermediate frequency signal based on the receiver reference frequency; the demodulator demodulates the intermediate frequency signal into an in-phase component and a quadrature component; and the processor converts the in-phase component and the quadrature component into a movement signal corresponding to movement of the target.

主权项

1. A system for wirelessly detecting movement of a target, the system comprising a reference oscillator, a transmitter, a receiver, a demodulator, a beam splitter, a collimating device, and a processor, wherein:
the reference oscillator is electrically coupled to the transmitter, the receiver, and the demodulator and generates a transmitter reference frequency, a receiver reference frequency, and a demodulator reference frequency, wherein each of the transmitter reference frequency, the receiver reference frequency, and the demodulator reference frequency has a different frequency, and wherein the transmitter reference frequency, the receiver reference frequency, and the demodulator reference frequency have locked phase angles such that the phase angles are synchronized; the transmitter generates a continuous-wave signal at a frequency based on the transmitter reference frequency and wirelessly transmits the continuous-wave signal to the beam splitter; the beam splitter optically couples the transmitter, the collimating device, and receiver together and is configured to split the continuous-wave signal into two components wherein a first component is directed to the collimating device and a second component is not used; the collimating device collimates and directs the first component of the continuous-wave signal to the target; the receiver wirelessly receives a reflected signal from the target, wherein the reflected signal comprises the continuous-wave signal reflected by the target, and wherein a phase angle of the reflected signal corresponds to movement of the target; the receiver converts the reflected signal into an intermediate frequency signal based on the receiver reference frequency; the demodulator is electrically coupled to the receiver and demodulates the intermediate frequency signal into an in-phase component and a quadrature component based on the phase angle of the reflected signal, wherein the demodulator uses the demodulator reference frequency to demodulate the intermediate frequency signal; and the processor is electrically coupled to the demodulator and converts the in-phase component and the quadrature component into a movement signal corresponding to movement of the target.