Instrument-Based Noncontact Doppler Radar Vital Sign Detection System Using Heterodyne Digital Quadrature Demodulation Architecture

In this paper, we present a fast solution to build a Doppler radar system for noncontact vital sign detection (VSD) using instruments that are generally equipped in radio-frequency and communication laboratories. This paper demonstrates the feasibility of conducting research on VSD in ordinary radio...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2010-06, Vol.59 (6), p.1580-1588
Main Authors: Gu, Changzhan, Li, Changzhi, Lin, Jenshan, Long, Jiang, Huangfu, Jiangtao, Ran, Lixin
Format: Article
Language:English
Subjects:
Antennas
Architecture
Architecture (computers)
Arrays
Broadband antennas
Calibration
Channels
Demodulation
Digital
Digital quadrature demodulation
Doppler radar
heartbeat
Humans
Instruments
Laboratories
life detection
noncontact detection
Patch antennas
Quadratures
Radar detection
Radio frequency
remote sensing
respiration
software radio
Studies
variable-carrier-frequency test
vital sign
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Summary:In this paper, we present a fast solution to build a Doppler radar system for noncontact vital sign detection (VSD) using instruments that are generally equipped in radio-frequency and communication laboratories. This paper demonstrates the feasibility of conducting research on VSD in ordinary radio-frequency laboratories. The system is designed with a heterodyne digital quadrature demodulation architecture that helps mitigate quadrature channel imbalance and eliminate the complicated dc offset calibration required for arctangent demodulation. Moreover, its tunable carrier frequency helps select different optimal frequencies for different human objects. Two sets of extensive experiments have been carried out in the laboratory environment with a self-designed 2.4-GHz patch antenna array and a 1-18-GHz broadband antenna. The test results are satisfactory: for a 0-dBm transmit power, the detection range can be extended to 2.5 m with accuracy higher than 80%. The system is also capable of detecting vital signs in the presence of different obstructions between the subject and the antenna.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2009.2028208