Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar

William McDonnell, Ashish Mishra, Changzhi Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Nonlinear components can be used to generate third order intermodulation frequencies. Taking advantage of this phenomenon the movement of a nonlinear target can be monitored and distinguished from background clutter. This paper discusses the use of an intermodulation radar, operating in the 5.8-GHz ISM band, and a passive nonlinear tag, located on the wrist, to monitor human vital signs and more specifically to improve remote monitoring of the heart rate. The non-ideal background clutter rejection of an intermodulation radar allowed for the respiration rate to also be monitored. Since the movement of the chest reflects the two individual tones from the transmitter and not the third order intermodulation frequency, for which the receiver is tuned, the respiratory frequency component has a scaled amplitude in comparison to what is seen with the use of a Doppler radar. This prevents the heart rate from being indistinguishable from the harmonics of the respiration.

Original languageEnglish
Title of host publicationRWW 2020 - 2020 IEEE Radio and Wireless Symposium
PublisherIEEE Computer Society
Pages123-126
Number of pages4
ISBN (Electronic)9781728111209
DOIs
StatePublished - Jan 2020
Event2020 IEEE Radio and Wireless Symposium, RWW 2020 - San Antonio, United States
Duration: Jan 26 2020Jan 29 2020

Publication series

NameIEEE Radio and Wireless Symposium, RWS
Volume2020-January
ISSN (Print)2164-2958
ISSN (Electronic)2164-2974

Conference

Conference2020 IEEE Radio and Wireless Symposium, RWW 2020
Country/TerritoryUnited States
CitySan Antonio
Period01/26/2001/29/20

Keywords

  • Intermodulation
  • clutter rejection
  • nonlinear target
  • vital signs
  • wearable passive tag

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