Random Body Movement Cancellation for Non-Contact Vital Sign Detection
First Claim
1. A method for cancelling body movement effect for non-contact vital sign detection, the method comprising:
- sending at least two electromagnetic signals comprising a first electromagnetic signal with a first frequency to a first side of a body from a first electromagnetic wave transceiver and a second electromagnetic signal with a second frequency to a second side of a body from a second electromagnetic wave transceiver;
receiving at least a first reflected electromagnetic signal reflected back in response to the first electromagnetic wave on the first transceiver, and extracting out a first baseband complex signal therefrom and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic wave on the second transceiver, and extracting out a second baseband complex signal therefrom;
mathematically 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.
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Abstract
A method and system for cancelling body movement effect for non-contact vital sign detection is described. The method begins with sending on a first electromagnetic wave transceiver a first electromagnetic signal with a first frequency to a first side of a body, such as a person or animal. Simultaneously using a second electromagnetic wave transceiver a second electromagnetic signal is sent with a second frequency to a second side of a body, wherein the first frequency and the second frequency are different frequencies. A first reflected electromagnetic signal reflected back in response to the first electromagnetic wave on the first transceiver is received and a first baseband complex signal is extracted. Likewise a second reflected electromagnetic signal reflected back in response to the second electromagnetic wave on the second transceiver is received and a second baseband complex signal is extracted. The first baseband complex signal is mathematically combined with the second baseband complex signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect.
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Citations
16 Claims
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1. A method for cancelling body movement effect for non-contact vital sign detection, the method comprising:
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sending at least two electromagnetic signals comprising a first electromagnetic signal with a first frequency to a first side of a body from a first electromagnetic wave transceiver and a second electromagnetic signal with a second frequency to a second side of a body from a second electromagnetic wave transceiver; receiving at least a first reflected electromagnetic signal reflected back in response to the first electromagnetic wave on the first transceiver, and extracting out a first baseband complex signal therefrom and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic wave on the second transceiver, and extracting out a second baseband complex signal therefrom; mathematically 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for cancelling body movement effect for non-contact vital sign detection, the system comprising:
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at least a first electromagnetic wave transceiver and at least a second electromagnetic wave transceiver, wherein first electromagnetic wave transceiver sends on a first electromagnetic signal with a first frequency to a first side of a body and for receiving a first reflected electromagnetic signal reflected back in response to the first electromagnetic wave on the first transceiver, and extracting out a first baseband complex signal therefrom; wherein the second electromagnetic wave transceiver for sending a second electromagnetic signal with a second frequency to a second side of a body, wherein the first frequency and the second frequency are different frequencies and for receiving a second reflected electromagnetic signal reflected back in response to the second electromagnetic wave on the second transceiver, and extracting out a second baseband complex signal therefrom; a processor for mathematically 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification