Abstract
Vital detection on the basis of Doppler radars has drawn a great deal of attention from researchers because of its high potential for applications in biomedicine, surveillance, and finding people alive under debris during natural hazards. In this research, the signal-to-noise ratio (SNR) of the remote vital-sign detection system is investigated. On the basis of different types of noise, such as phase noise, Gaussian noise, leakage noise between the transmitting and receiving antennae, and so on, the SNR of the system has first been examined. Then the research has focused on the investigation of the detection and false alarm probabilities of the system when the transmission link between the human and the radar sensor system took the Nakagami-m channel model. The analytical model for the false alarm and the detection probabilities of the system have been derived. The proposed theoretical models for the SNR and detection probability match with the simulation and measurement results. These theoretical models have the potential to be used as good references for the hardware development of the vital-sign detection radar sensor system.
Highlights
The non-contact monitoring of vital signals has attracted much attention recently
The measured result of the signal-to-noise ratio (SNR) was close to the theoretical calculation
This theoretical model is a basis for hardware development
Summary
The non-contact monitoring of vital signals (heart beat and breathing rate) has attracted much attention recently. Sensors 2018, 18, 694 investigated UWB system-on-chip radar sensors in 90 nm CMOS technology This system could detect the heart beat and respiration of adults and babies and allowed for the continuous observation of a baby’s breathing rate. In comparison with previous studies, in terms of a channel radio link between the vital-sign-detecting radar system and the human, this research considers a more realistic and common channel model, the Nakagami-m, for the vital-sign-detecting radar sensor system. To the best of the authors’ knowledge, this is the first work to use the SNR at the base band under the Nakagami-m radio channel link between a living person and the radar sensor system. The detection/false alarm probabilities of the vital-sign-detecting radar sensor system have been established, simulated and analyzed
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