Respiratory monitoring using a Doppler radar with passive harmonic tags to reduce interference from environmental clutter.
A harmonic tag was designed and fabricated to show the feasibility of sensing cardiopulmonary related Doppler shift in the received second harmonic signal. A fundamental frequency of 2.45 GHz was transmitted at a target and a quadrature homodyne receiver used to sense the received signal from a tag on the target. The setup was used to successfully isolate periodic motion from a tag on a programmable mechanical target and to sense respiratory motion of a human subject, even when the targets were in close proximity to other moving objects.
Singh
Aditya
A
Department of Electrical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA. singha@hawaii.edu
Lubecke
Victor
V
D000465:Algorithms; D004301:Doppler Effect; D004582:Electronics, Medical / Q000295:instrumentation; D004867:Equipment Design / Q000295:instrumentation; D006801:Humans; D015233:Models, Statistical; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods; D009038:Motion; D011825:Radar / Q000295:instrumentation*; D012137:Respiratory System; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013686:Telemetry / Q000295:instrumentation*; D014159:Transducers