Patent
Random body movement cancellation for non-contact vital sign detection
TLDR
In this paper, a method and system for cancelling body movement effect for non-contact vital sign detection is described, where a first 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.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.read more
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Patent
Non-contact physiologic motion sensors and methods for use
TL;DR: In this paper, a radar-based physiological motion sensor is disclosed, where Doppler-shifted signals can be extracted from the signals received by the sensor, which can be digitized and processed subsequently to extract information related to the cardiopulmonary motion in one or more subjects.
Patent
Wireless physiology monitor
TL;DR: In this paper, the authors proposed a non-invasive technique for organ, e.g., heart and lung, monitoring using Doppler effect principles, which measured heart rate and motion from the differences in frequency, phase, and/or wavelength between the source signal and the modified signal reflected back from the heart moving within the patient.
Patent
Systems and methods for non-contact multiparameter vital signs monitoring, apnea therapy, apnea diagnosis, and snore therapy
TL;DR: In this article, a noncontact physiological motion sensor and a monitor device that can incorporate use of the Doppler effect are described. But, they do not discuss the use of such a sensor to determine apnea or snoring events.
Patent
Life detecting radars
James Lux,Vaughn Cable,Salman-ul Mohammed Haque,Michael Ray McKee,Hirad Ghaemi,Ohanian Richard Kalantar +5 more
TL;DR: In this article, a system and methods for detecting biometrics using a life detecting radar are disclosed, which can include transmit antennas configured to transmit continuous microwave (CW) radio signals that reflect back upon making contact with various objects.
Patent
Contactless respiration monitoring of a patient
TL;DR: In this paper, the authors proposed a method for detection of respiration of a patient comprising the following steps: emitting an electromagnetic signal towards the patient, receiving a reflected electromagnetic signal reflected from the patient; converting the reflected electromagnetic signals, yielding a first signal; phase shifting the reflected signals and converting the phase-shifted reflected signals yielding a second signal.
References
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