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US 12,727,769 B2Granted
Near-field coherent sensing methods and systems
AssigneeCornell University
InventorsXiaonan Hui, Edwin C. Kan
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Abstract
Near-field coherent sensing (NCS) methods and systems are described herein. The techniques may be used to monitor vital signs is introduced herein. Multiple-input, multiple output near-field techniques may be used to characterize motion. In some embodiments, the methods and systems are used to measure cardiac motion. In some embodiments, the disclosed system is integrated into a seat, such as, for example, a car seat. The system be configured to monitor the vital signs of a seat occupant with multiple sensing points. The sensor can be integrated into the cushion and hence “invisible” to the user.
Claims20
A system for measuring motion of an individual, comprising:
- a first signal source for generating a first sensing signal;
- a first Tx antenna in electrical communication with the first signal source and wherein the first Tx antenna is configured to be disposed within a near-field coupling range of a first motion to be measured such that the first sensing signal is modulated by the first motion to generate a first measurement signal;
- a first receiver for detecting the first measurement signal;
- a first Rx antenna in communication with the first receiver;
- and
- a signal processing circuit configured to match the first sensing signal and the first measurement signal, the signal processing circuit comprising a cancellation circuit, wherein the first sensing signal and the first measurement signal are matched using the cancellation circuit to reduce one or more non-modulated first sensing signals that are detected in addition to the first measurement signal, and wherein the first motion is measured based on the first measurement signal with the reduced one or more non-modulated first sensing signals, wherein the cancellation circuit comprises a coupler configured to receive the first sensing signal from the first signal source, an attenuator configured to attenuate an amplitude of the first sensing signal based on feedback information, a phase shifter configured to shift a phase of the first sensing signal based on the feedback information, a frequency doubler configured to double a frequency of the first sensing signal, and a combiner configured to match the attenuated first sensing signal with the first measurement signal.
3 more elements
A system for measuring motion of an individual, comprising:
- a first signal source for generating a first sensing signal;
- a first Tx antenna in electrical communication with the first signal source and wherein the first Tx antenna is configured to be disposed within a near-field coupling range of a first motion to be measured such that the first sensing signal is modulated by the first motion to generate a first measurement signal;
- a first receiver for detecting the first measurement signal;
- a first Rx antenna in communication with the first receiver;
- a signal processing circuit configured to match the first sensing signal and the first measurement signal, the signal processing circuit comprising a cancellation circuit, wherein the first sensing signal and the first measurement signal are matched using the cancellation circuit to reduce one or more non-modulated first sensing signals that are detected in addition to the first measurement signal, and wherein the first motion is measured based on the first measurement signal with the reduced one or more non-modulated first sensing signals;
- a second signal source for generating a second sensing signal;
- a second Tx antenna in electrical communication with the second signal source and wherein the second Tx antenna is configured to be disposed within a near-field coupling range of a second motion to be measured such that the second sensing signal is modulated by the second motion to generate a second measurement signal;
- a second receiver configured to detect the second measurement signal;
- a second Rx antenna in electrical communication with the second receiver, wherein the signal processing circuit is configured to match the second sensing signal and the second measurement signal;
- and
- a processor configured to confirm an identity of the individual based on a dynamic time warping (DTW) distance of a cross-coupled measurement signal.
8 more elements
A system for measuring motion of an individual, comprising:
- a first signal source for generating a first sensing signal;
- a first Tx antenna in electrical communication with the first signal source and wherein the first Tx antenna is configured to be disposed within a near-field coupling range of a first motion to be measured such that the first sensing signal is modulated by the first motion to generate a first measurement signal;
- a first receiver for detecting the first measurement signal;
- a first Rx antenna in communication with the first receiver;
- a signal processing circuit configured to match the first sensing signal and the first measurement signal, the signal processing circuit comprising a cancellation circuit, wherein the first sensing signal and the first measurement signal are matched using the cancellation circuit to reduce one or more non-modulated first sensing signals that are detected in addition to the first measurement signal, and wherein the first motion is measured based on the first measurement signal with the reduced one or more non-modulated first sensing signals;
- and
- a first downlink source for generating a downlink signal, and wherein the first signal source is a wireless tag configured to receive the downlink signal and generate the first sensing signal.
4 more elements
Dependencies are inferred from the claim text.