Derivation of physiological parameters from a radar signal
AssigneeNeteera Technologies Ltd.
InventorsReinier Doelman, Ehud Fishler
Life of this patent
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Abstract
Apparatus and methods are described including deriving a subject's heart rate from in-phase and the quadrature signals received by a radar. The in-phase and quadrature signals are processed to generate two or more outputs using two or more respective methods. For each of the two or more outputs, for each of a plurality of time segments, the subject's heart rate is derived from the filtered signal, and quality scores are assigned to the subject's heart rate as derived for each of the plurality of time segments from each of the two or more outputs. At least partially based upon the quality scores, the subject's heart rate is derived using the output of one of the methods. Other applications are also described.
Claims20
A method for deriving a heart rate of a subject comprising the steps of:
- receiving in-phase and quadrature signals using a radar;
- and
- deriving a subject's heart rate from the in-phase and the quadrature signals by:
- processing the in-phase and quadrature signals to generate two or more outputs using two or more respective methods, the two or more methods comprising at least two out of:
- (a) calculating a phase of each of the in-phase and the quadrature signals with respect to a center for each point in time,
- (b) calculating a complex signal based upon the in-phase and the quadrature signals, and
- (c) calculating a linear combination of the in-phase and quadrature signals;
- for each of the two or more outputs:
- filtering the outputsignal to at least partially dampen frequencies that are below a minimum frequency to generate a filtered signal;
- dividing the filtered signal into a plurality of time segments;
- and
- for each of the plurality of time segments, deriving the subject's heart rate from the filtered signal;
- assigning quality scores to the subject's heart rate as derived for each of the plurality of time segments from each of the two or more outputs;
- and
- at least partially based upon the quality scores, selecting to derive the subject's heart rate using the output of either method (a), (b), or (c);
- and
- outputting the subject's heart rate, as derived using the selected output.
Apparatus for deriving a heart rate of a subject, for use with a radar, the apparatus comprising:
- at least one computer processor configured to:
- receive in-phase and quadrature signals from the radar;
- derive a subject's heart rate from the in-phase and the quadrature signals by:
- processing the in-phase and quadrature signals to generate two or more outputs using two or more respective methods, the two or more methods comprising at least two out of:
- (a) calculating a phase of each of the in-phase and the quadrature signals with respect to a center for each point in time,
- (b) calculating a complex signal based upon the in-phase and the quadrature signals, and
- (c) calculating a linear combination of the in-phase and quadrature signals;
- for each of the two or more outputs:
- filtering the output to at least partially dampen frequencies that are below a minimum frequency to generate a filtered signal;
- dividing the filtered signal into a plurality of time segments;
- and
- for each of the plurality of time segments, deriving the subject's heart rate from the filtered signal;
- assigning quality scores to the subject's heart rate as derived for each of the plurality of time segments from each of the two or more outputs;
- and
- at least partially based upon the quality scores, selecting to derive the subject's heart rate using the output of either method (a), (b), or (c);
- and output the subject's heart rate, as derived using the selected output.
Dependencies are inferred from the claim text.