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Non-Contact Monitoring of Human Vital Signs Using FMCW Millimeter Wave Radar in the 120 GHz Band
- Source :
- Sensors, Volume 21, Issue 8, Sensors (Basel, Switzerland), Sensors, Vol 21, Iss 2732, p 2732 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- A non-contact heartbeat/respiratory rate monitoring system was designed using narrow beam millimeter wave radar. Equipped with a special low sidelobe and small-sized antenna lens at the front end of the receiving and transmitting antennas in the 120 GHz band of frequency-modulated continuous-wave (FMCW) system, this sensor system realizes the narrow beam control of radar, reduces the interference caused by the reflection of other objects in the measurement background, improves the signal-to-clutter ratio (SCR) of the intermediate frequency signal (IF), and reduces the complexity of the subsequent signal processing. In order to solve the problem that the accuracy of heart rate is easy to be interfered with by respiratory harmonics, an adaptive notch filter was applied to filter respiratory harmonics. Meanwhile, the heart rate obtained by fast Fourier transform (FFT) was modified by using the ratio of adjacent elements, which helped to improve the accuracy of heart rate detection. The experimental results show that when the monitoring system is 1 m away from the human body, the probability of respiratory rate detection error within ±2 times for eight volunteers can reach 90.48%, and the detection accuracy of the heart rate can reach 90.54%. Finally, short-term heart rate measurement was realized by means of improved empirical mode decomposition and fast independent component analysis algorithm.
- Subjects :
- Computer science
Acoustics
0206 medical engineering
Fast Fourier transform
narrow beam
frequency correction
02 engineering and technology
lcsh:Chemical technology
Band-stop filter
Biochemistry
Article
Analytical Chemistry
law.invention
Respiratory Rate
law
Heart Rate
non-contact measurement
0202 electrical engineering, electronic engineering, information engineering
Humans
lcsh:TP1-1185
Electrical and Electronic Engineering
Radar
Instrumentation
Signal processing
Vital Signs
020206 networking & telecommunications
Signal Processing, Computer-Assisted
adaptive notch
Filter (signal processing)
millimeter wave radar
020601 biomedical engineering
Atomic and Molecular Physics, and Optics
Intermediate frequency
fast independent component analysis
Extremely high frequency
Antenna (radio)
Algorithms
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Database :
- OpenAIRE
- Journal :
- Sensors
- Accession number :
- edsair.doi.dedup.....dc8bb71318b5e41a1335ee4d6a07ded5
- Full Text :
- https://doi.org/10.3390/s21082732