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, comprising:
- sending 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 the body from a second electromagnetic wave 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 electromagnetic wave transceiver and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal via the second electromagnetic wave transceiver;
generating a baseband output by combining a first baseband complex signal extracted from the first reflected electromagnetic signal with a second baseband complex signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, where the first baseband complex signal and the second baseband complex signal are combined by complex signal demodulation as expressed by;
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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
20 Claims
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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 electromagnetic wave transceiver and a second electromagnetic signal with a second frequency to a second side of the body from a second electromagnetic wave 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 electromagnetic wave transceiver and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal via the second electromagnetic wave transceiver; generating a baseband output by combining a first baseband complex signal extracted from the first reflected electromagnetic signal with a second baseband complex signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, where the first baseband complex signal and the second baseband complex signal are combined by complex signal demodulation as expressed by; - View Dependent Claims (2, 3, 4, 5)
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6. 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 electromagnetic wave transceiver and a second electromagnetic signal with a second frequency to a second side of the body from a second electromagnetic wave 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 electromagnetic wave transceiver and receiving at least a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal via the second electromagnetic wave transceiver; and generating a baseband output by combining a first baseband complex signal extracted from the first reflected electromagnetic signal with a second baseband complex signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, where the first baseband complex signal and the second baseband complex signal are combined by arctangent demodulation as expressed by; - View Dependent Claims (7, 8, 9, 10)
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11. A system for cancelling body movement effect for non-contact vital sign detection, comprising:
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a first electromagnetic wave transceiver configured to send a first electromagnetic signal with a first frequency to a first side of a body and receive a first reflected electromagnetic signal reflected back in response to the first electromagnetic signal; a second electromagnetic wave transceiver configured to send a second electromagnetic signal with a second frequency to a second side of the body, where the first frequency and the second frequency are different frequencies, and receive a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal, 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
);a processing system configured to generate a baseband output by combining a first baseband complex signal extracted from the first reflected electromagnetic signal with a second baseband complex signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, where the first baseband complex signal and the second baseband complex signal are combined by complex signal demodulation as expressed by; - View Dependent Claims (12, 13, 14, 15)
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16. A system for cancelling body movement effect for non-contact vital sign detection, comprising:
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a first electromagnetic wave transceiver configured to send a first electromagnetic signal with a first frequency to a first side of a body and receive a first reflected electromagnetic signal reflected back in response to the first electromagnetic wave signal; a second electromagnetic wave transceiver configured to send a second electromagnetic signal with a second frequency to a second side of the body, where the first frequency and the second frequency are different frequencies, and receive a second reflected electromagnetic signal reflected back in response to the second electromagnetic signal, 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
);a processing system configured to generate a baseband output by combining a first baseband complex signal extracted from the first reflected electromagnetic signal with a second baseband complex signal extracted from the second reflected electromagnetic signal to cancel out a Doppler frequency drift therebetween to yield a periodic Doppler phase effect, where the first baseband complex signal and the second baseband complex signal are combined by arctangent demodulation as expressed by; - View Dependent Claims (17, 18, 19, 20)
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Specification