Experiment and spectral analysis of a low-power K a-band heartbeat detector measuring from four sides of a human body

Changzhi Li, Yanming Xiao, Jenshan Lin

Research output: Contribution to journalArticle

171 Scopus citations

Abstract

The accuracy of a K a-band physiological movement detector was tested and compared for measurements from four different body orientations and at five different distances. A rigorous spectral analysis approach is developed when previously adopted small-angle approximation model is not applicable. This theory analyzes in detail the harmonics observed in phase-modulated K a-band Doppler radar, explaining the reason for better heart-rate accuracy when detected from the back of the body. It also explains the advantage of double-sideband transmission in avoiding the null point problem. Simulations have been performed to illustrate this theory and provide design guidelines for the system. This theory has also been verified by experiments.

Original languageEnglish
Pages (from-to)4464-4471
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume54
Issue number12
DOIs
StatePublished - Dec 2006

Keywords

  • Biomedicine
  • Cardiopulmonary
  • Detector
  • Double sideband
  • Electromagnetic wave
  • Heartbeat
  • K a-band
  • Life sign
  • Low power
  • Microwave
  • Millimeter wave
  • Noncontact
  • RF
  • Remote sensing
  • Respiration
  • Sensor
  • Spectral analysis
  • Telemedicine
  • Vital sign
  • Wireless

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