METHOD AND DEVICE FOR MEASURING BIOMETRIC DATA USING UWB RADAR

• US 20160089052A1
• Filed: 06/23/2015
• Published: 03/31/2016
• Est. Priority Date: 09/26/2014
• Status: Abandoned Application

• Current Assignee: Wrt Lab Co.Ltd.
• Original Assignee: Industry-University Cooperation Foundation Hanyang University
• Inventors: CHO, Sung Ho, CHOI, Jeong Woo, KHAN, Faheem
• Application Number:
  US14/748,061
• Publication Number:
  US 20160089052A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence

Abstract

A method and device for measuring biometric data using a UWB radar are disclosed. The disclosed method includes: (a) determining a respiratory rate by using reflection signals reflected off a target patient; (b) extracting respiration signals from the reflection signals, removing the extracted respiration signals from the reflection signals and converting into signals of a frequency domain; and (c) determining a heartbeat rate by detecting peak values from the frequency-domain signals converted in said step (b).

Claims

1. A method of measuring biometric data using a UWB radar, the method comprising:

(a) determining a respiratory rate by using reflection signals reflected off a target patient;

(b) extracting respiration signals from the reflection signals, removing the extracted respiration signals from the reflection signals and converting into signals of a frequency domain; and

(c) determining a heartbeat rate by detecting peak values from the frequency-domain signals converted in said step (b).

2. The method of claim 1, wherein extracting the respiration signals in said step (b) comprises the steps of:

(b1) calculating a mean value of magnitude values of sample times within a second reference time from a particular sample time excluding sample times within a first reference time from the particular sample time, the second reference time being longer than the first reference time; and

(b2) replacing a magnitude value of the particular sample time with the mean value, wherein said steps (b1) and (b2) are performed for all sample times in a predesignated segment.

3. The method of claim 2, wherein said step (c) comprises:

determining the heartbeat rate as a frequency corresponding to a peak value within a predesignated frequency range from among a plurality of detected peak values.

4. The method of claim 2, wherein said step (c) comprises:

removing harmonic components of the respiratory rate; and

determining the heartbeat rate by using the peak values having the harmonic component removed therefrom.

5. The method of claim 4, wherein said steps (a) through (c) are performed multiple times, and said step (c) comprises determining the heartbeat rate by using at least one of a repetition frequency of peak values and a magnitude of peak values.

6. The method of claim 4, wherein said removing of the harmonic components comprises:

detecting a plurality of peak values within a predesignated frequency range and removing peak values corresponding to harmonic components from among the detected peak values, and the predesignated frequency range is determined based on a heartbeat rate of the target patient.

7. A device for measuring biometric data using a UWB radar, the device comprising:

a frequency converter unit configured to convert reflection signals reflected off a target patient into frequency-domain signals;

a respiratory rate determiner unit configured to determine a respiratory rate by using the frequency-domain signals for the reflection signals converted by the frequency converter unit;

a peak detector unit configured to detect a plurality of peak values from frequency-domain signals obtained by extracting respiration signals from the reflection signals and removing the extracted respiration signals from the reflection signals and to remove harmonic components of the determined respiratory rate; and

a heartbeat rate determiner unit configured to determine a heartbeat rate as one of the peak values remaining after removing the harmonic components.

8. The device of claim 7, wherein the respiration signals are extracted by performing a procedure for all sample times within a predesignated segment, the procedure comprising:

calculating a mean value of magnitude values of sample times within a second reference time from a particular sample time excluding sample times within a first reference time from the particular sample time, the second reference time being longer than the first reference time;

and replacing a magnitude value of the particular sample time with the mean value.

9. The device of claim 7, wherein the heartbeat rate determiner unit determines the heartbeat rate as a frequency corresponding to a peak value within a predesignated frequency range from among the plurality of peak values detected.

10. The device of claim 7, wherein the heartbeat rate determiner unit determines the heartbeat rate using at least one of a repetition frequency of the peak values and a magnitude of the peak values for the reflection signals obtained over a plurality of repetitions.

11. A method of measuring biometric data using a UWB radar, the method comprising:

analyzing frequency components after obtaining frequency-domain signals for reflection signals reflected off a target patient;

repeating the analyzing for a predesignated number of times to detect a plurality of peak values in a predesignated frequency range and removing harmonic components for a maximum peak value from the frequency components; and

determining a heartbeat rate by using at least one of a repetition frequency and a magnitude of the peak values from among frequencies for the peak values having the harmonic components removed therefrom.

12. The method of claim 11, wherein a frequency for the maximum peak value is a respiratory rate.

13. The method of claim 12, wherein the frequency is per-minute frequency.

14. The method of claim 11, wherein the removing of the harmonic components comprises detecting a plurality of peak values in a predesignated frequency range, and the predesignated frequency range is determined according to a heartbeat rate of the target patient.

15. The method of claim 11, wherein the determining of the heartbeat rate comprises determining the heartbeat rate as a frequency corresponding to maximum repetition frequency and maximum mean magnitude.

16. A device for measuring biometric data using a UWB radar, the device comprising:

a frequency converter unit configured to convert reflection signals reflected off a target patient into frequency-domain signals and analyze frequency components;

a respiratory rate determiner unit configured to determine a respiratory rate by using the frequency-domain signals for the reflection signals converted by the frequency converter unit;

a peak detector unit configured to detect a plurality of peak values from results of repeating the frequency component analysis a predesignated number of times and removing harmonic components of the respiratory rate frequency determined by the respiratory rate determiner unit; and

a heartbeat rate determiner unit configured to determine a heartbeat rate by using at least one of a repetition frequency and a magnitude of the peak values from among frequencies for peak values having the harmonic components removed therefrom.