Radar remote monitoring of vital signs

Changzhi Li, Julie Cummings, Jeffrey Lam, Eric Graves, Wenhsing Wu

Research output: Contribution to specialist publicationArticle

206 Scopus citations


The development of microwave Doppler radar phase modulation has led to the introduction of alternative sources for noncontact respiration and heartbeat monitoring. It is observed that a Doppler radar uses double-sideband transmission for vital sign detection from four sides of a human body. An unmodulated radio-frequency signal is transmitted toward the human body, where it is phase-modulated by the periodic physiological movement and reflected back to the receiver. It is observed that the radar receiver captures the reflected signal and demodulates it to extract the vital sign signal components. Microwave Doppler phase-modulation has several advantages over conventional noncontact measurement methods. The microwave method does not confine or inhibit the patient and performs monitoring of vita signs, without causing discomfort, or skin irritation. The method is beneficial for monitoring vital signs over extended periods of time, making the detector suitable for long-term continuous monitoring.

Original languageEnglish
Number of pages10
Specialist publicationIEEE Microwave Magazine
StatePublished - Feb 2009


Dive into the research topics of 'Radar remote monitoring of vital signs'. Together they form a unique fingerprint.

Cite this