Low-Cost Differential Front-End for Doppler Radar Vital Sign Monitoring
Name
Fletcher-2009-Low-Cost Differential Front-End for Doppler Radar Vital Sign Monitoring.pdf
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602.22 KB
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Adobe PDF
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Author(s)
Fletcher, Richard Ribon
Han, Jing
Date Issued
July 2009
Journal
IEEE MTT-S International Microwave Symposium Digest, 2009.
Publisher
Institute of Electrical and Electronics Engineers
Citation
Fletcher, R., and Jing Han. “Low-cost differential front-end for Doppler radar vital sign monitoring.” Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International. 2009. 1325-1328. © 2009 IEEE
Version
Final published version
Abstract
We present a differential front end design for improving the performance of short-range low-cost Doppler radars for vital sign detection with application to automotive driver safety systems, health monitoring, and security screening. By using dual helical antennas each with a 40-degree beamwidth, it is possible to illuminate the body in two adjacent locations to perform a differential measurement. Since only one of the beams illuminates the heart, the baseband signal from the second radar is used for motion cancellation. We demonstrate this approach using a custom-designed dual helical antenna and simple direct-conversion radar circuits implemented in microstrip operating at 2.460 GHz and 2.510 GHz., respectively. Heart rate data is shown for detection distances of 0.5 meter showing reduction in background motion noise compared to data from traditional single radar unit design.
Subjects
Doppler radar
biomedical signal detection
differential
heart rate
helical antenna
vital sign
MIT Department
Massachusetts Institute of Technology. Media Laboratory
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1109/MWSYM.2009.5165949
