Heart Rate Tracking Using a Doppler Radar With the Reassigned Joint Time-Frequency Transform

Author

Lee, Choonghee ; Yoon, Chiyul ; Kong, Hyoun-Joong ; Hee Chan Kim ; Kim, Youngwook

Author_Institution

Interdiscipl. Program, Seoul Nat. Univ., Seoul, South Korea

Volume

10

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

1096

Lastpage

1099

Abstract

Heart rate variations are tracked using an RF Doppler signal by applying a reassigned joint time-frequency transform (RJTFT). In time-frequency analysis, RJTFT improves the readability of the heart rate on a spectrogram and the heart rate is continuously tracked with it. To verify the result, a heartbeat signal was acquired from a stationary human subject using a Doppler radar unit. The sensor operating at 2.45 GHz was located a distance of 0.5 m from the subject. Using the RJTFT, the heart rate was clearly extracted, thereby improved the readability. A reference heart rate was measured by a photoplethysmography (PPG) device and compared with the heart rate tracked by the RJTFT. The resulting root mean square (RMS) difference of the heart rate measured by the two methods was 5%.

Keywords

Doppler radar; biomedical measurement; cardiology; feature extraction; mean square error methods; medical signal processing; photoplethysmography; time-frequency analysis; transforms; Doppler radar; PPG; RJTFT; frequency 2.45 GHz; heart rate tracking; heartbeat signal; photoplethysmography; reassigned joint time-frequency transform; root mean square; spectrogram; time-frequency analysis; Doppler effect; Doppler radar; Heart beat; Radar tracking; Spectrogram; Time frequency analysis; Doppler vital sensor; heart rate; joint time-frequency analysis (JTFA); reassigned joint time-frequency analysis;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2168511

Filename

6021332