A direct phase-tracking doppler radar using wavelet independent component analysis for non-contact respiratory and heart rate monitoring

Marco Mercuri, Yao Hong Liu, Ilde Lorato, Tom Torfs, Fokko Wieringa, Andre Bourdoux, Chris Van Hoof

Research output: Contribution to journalArticleAcademicpeer-review

30 Citations (Scopus)

Abstract

A continuous wave Doppler radar, operating as a phase-locked-loop in phase demodulator configuration, is proposed and in vivo demonstrated for noncontact vital signs monitoring. The radar architecture exhibits a unique precision in tracking the phase modulation caused by human cardiopulmonary activity from which heartbeat and respiration can simultaneously be extracted. The single mixer architecture is immune to the null point and does not require small-angle approximation conditions, which distinguishes it from pre-existing other approaches. This enables the proposed radar to behave highly linear, with very precise detection of phase modulations induced by any kind of movement, independently from amplitude and speed. After simulations and technical tests to validate functionality and safety of the proposed architecture, a practical setup was demonstrated on human volunteers. Wavelet independent component analysis was applied to successfully retrieve respiratory and heart rate information from the radar baseband signal.

Original languageEnglish
Pages (from-to)632-643
Number of pages12
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Contactless
  • Doppler radar
  • null-point elimination
  • phase-locked loop
  • RF-based sensing
  • small-angle approximation
  • vital signs monitoring
  • wavelet independent component analysis

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