Phase-Based Methods for Heart Rate Detection Using UWB Impulse Doppler Radar
| Autor: | Aly E. Fathy, Lingyun Ren, Haofei Wang, Ozlem Kilic, Krishna Naishadham |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Radiation
Heartbeat Computer science Pulse-Doppler radar Acoustics Physics::Medical Physics 020208 electrical & electronic engineering Doppler radar Fast Fourier transform 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics law.invention Continuous-wave radar Harmonic analysis law 0202 electrical engineering electronic engineering information engineering Electronic engineering Demodulation Spectrogram Electrical and Electronic Engineering Computer Science::Information Theory |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 64:3319-3331 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2016.2597824 |
| Popis: | Ultra-wideband (UWB) pulse Doppler radars can be used for noncontact vital signs monitoring of more than one subject. However, their detected signals typically have low signal-to-noise ratio (SNR) causing significant heart rate (HR) detection errors, as the spurious harmonics of respiration signals and mixed products of respiration and heartbeat signals (that can be relatively higher than heartbeat signals) corrupt conventional fast Fourier transform spectrograms. In this paper, we extend the complex signal demodulation (CSD) and arctangent demodulation (AD) techniques previously used for accurately detecting the phase variations of reflected signals of continuous wave radars to UWB pulse radars as well. These detection techniques reduce the impact of the interfering harmonic signals, thus improving the SNR of the detected vital sign signals. To further enhance the accuracy of the HR estimation, a recently developed state-space method has been successfully combined with CSD and AD techniques and over 10 dB improvements in SNR is demonstrated. The implementation of these various detection techniques has been experimentally investigated and full error and SNR analysis of the HR detection are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|