Patent ID: 8721554

Claim:
A method for cancelling body movement effect for non-contact vital sign detection, the method comprising: providing a first transceiver and a second transceiver; simultaneously sending a first electromagnetic signal with a first frequency to a first side of a body from the first transceiver and a second electromagnetic signal with a second frequency to a second side of a body from the second transceiver, wherein the second side of the body is an opposite side of the body from the first side of the body; receiving at least a first reflected signal reflected back in response to the first electromagnetic signal via the first transceiver; extracting out a first baseband complex signal from the first reflected signal; receiving at least a second reflected signal reflected back in response to the second electromagnetic signal via the second transceiver; extracting out a second baseband complex signal from the second reflected signal; providing an apparatus for combining the first baseband complex signal with the second baseband complex signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, wherein the apparatus comprises a processor and/or hardware; and combining the first baseband complex signal with the second baseband complex signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect via the apparatus.