TY - GEN
T1 - Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar
AU - McDonnell, William
AU - Mishra, Ashish
AU - Li, Changzhi
N1 - Funding Information:
wish to acknowledge the National Science Foundation (NSF) for funding support under Grant 1808613 and 1718483.
Funding Information:
ACKNOWLEDGEMENT The authors wish to acknowledge the support of the Texas Tech University REU program. The authors also
Publisher Copyright:
© 2020 IEEE.
PY - 2020/1
Y1 - 2020/1
N2 - 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.
AB - 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.
KW - Intermodulation
KW - clutter rejection
KW - nonlinear target
KW - vital signs
KW - wearable passive tag
UR - http://www.scopus.com/inward/record.url?scp=85083227551&partnerID=8YFLogxK
U2 - 10.1109/RWS45077.2020.9049979
DO - 10.1109/RWS45077.2020.9049979
M3 - Conference contribution
AN - SCOPUS:85083227551
T3 - IEEE Radio and Wireless Symposium, RWS
SP - 123
EP - 126
BT - RWW 2020 - 2020 IEEE Radio and Wireless Symposium
PB - IEEE Computer Society
Y2 - 26 January 2020 through 29 January 2020
ER -