An overnight vital signs monitoring system for elderly people using dual microwave radars

There were two key problems in applying Doppler radar to night-time heartbeats and respiration measurement systems. The first is noise associated with body movement and the second is the presence of undesired harmonics and intermodulation. We propose a background subtraction processing and three dif...

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Bibliographic Details
Published inAsia-Pacific Microwave Conference 2011 pp. 590 - 593
Main Authors Kagawa, M., Yoshida, Y., Kubota, M., Kurita, A., Matsui, T.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2011
Subjects
biomedical signal processing
Doppler radar
harmonics and intermodulation
Heart beat
heartbeat
Microwave measurements
Microwave theory and techniques
Monitoring
non-contact measurement
Radar cross section
random body movement
vital signs
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Summary:There were two key problems in applying Doppler radar to night-time heartbeats and respiration measurement systems. The first is noise associated with body movement and the second is the presence of undesired harmonics and intermodulation. We propose a background subtraction processing and three different methods of combining the radar output spectra. In particular, a method involving real-time selection of the best radar-output channel by comparing the numbers of large peaks in the FFT spectrum, is found to be effective in improving the measurement accuracy. A prototype of the system was set up at a nursing home and field tests were carried out with elderly subjects. Despite the subjects engaging in frequent body movements while sleeping, the system was quite effective in monitoring vital signs (r=0.625-0.812).
ISBN:9781457720345
1457720345
ISSN:2165-4727