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RANDOM BODY MOVEMENT CANCELLATION FOR NON-CONTACT VITAL SIGN DETECTION

  • US 20160374622A1
  • Filed: 09/08/2016
  • Published: 12/29/2016
  • Est. Priority Date: 07/12/2007
  • Status: Active Grant
First Claim
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1. A method for cancelling body movement effect for non-contact vital sign detection, comprising:

  • sending a first electromagnetic signal with a first frequency to a first side of a body from a first transceiver and a second electromagnetic signal with a second frequency to a second side of the body from a second transceiver, where the first frequency of wavelength λ

    1 and the second frequency of wavelength λ

    2 are close to each other so that (λ

    1

    λ

    2

    λ

    );

    receiving at least a first reflected electromagnetic signal reflected back in response to the first electromagnetic signal via the first transceiver and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal via the second transceiver;

    generating an angular information output by combining a first angular information signal extracted from the first reflected electromagnetic signal with a second angular information signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween, where the first and second angular information signals are combined by arctangent demodulation as expressed by;

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