scholarly journals Assessment of Human Respiration Patterns via Noncontact Sensing Using Doppler Multi-Radar System

Sensors ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 6383-6398 ◽  
Author(s):  
Changzhan Gu ◽  
Changzhi Li
Keyword(s):  
Radar System ◽  
Human Respiration

scholarly journals Improved FMCW Radar System for Multi-Target Detection of Human Respiration Vital Sign

2019 ◽  
Vol 19 (2) ◽  
pp. 38
Author(s):  
Hana Pratiwi ◽  
Mujib R. Hidayat ◽  
A. A. Pramudita ◽  
Fiky Y. Suratman
Keyword(s):  
Target Detection ◽  
Continuous Wave ◽  
Beat Frequency ◽  
Radar System ◽  
Small Displacement ◽  
Phase Detection ◽  
Detection Capability ◽  
Fmcw Radar ◽  
Large Bandwidth ◽  
Human Respiration

Frequency Modulated Continuous Wave (FMCW) radar system has been developed and applied for various needs. Based on the conventional FMCW radar concept, a large bandwidth is needed to detect small displacements in the chest wall or abdomen related with respiratory activity. To overcome the need for large bandwidths in detecting vital respiratory signs, several improvements to the FMCW system are proposed in this paper. The phase-detection concept has been elaborated in improving the capability of FMCW to detect the small displacement. In developing multi-target detection capability, range detection capability through beat frequency output needs to be combined with the phase-detection method. Theoretical and simulation studies were performed to investigate the concept of combining range detection and phase detection for detecting respiration on multi-target. The results show that the proposed method is well-performed in detecting the multi-target respiration in high noise reflection.

scholarly journals Portable Micro-Doppler Radar with Quadrature Radar Architecture for Non-Contact Human Breath Detection

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5807
Author(s):  
Catur Apriono ◽  
Fathul Muin ◽  
Filbert H. Juwono
Keyword(s):  
Respiration Rate ◽  
Doppler Radar ◽  
Detection System ◽  
Experimental System ◽  
Radar System ◽  
Acceptable Error ◽  
Radio Detection ◽  
Human Respiration ◽  
Technology Applications ◽  
Main Component

Recently, rapid advances in radio detection and ranging (radar) technology applications have been implemented in various fields. In particular, micro-Doppler radar has been widely developed to perform certain tasks, such as detection of buried victims in natural disaster, drone system detection, and classification of humans and animals. Further, micro-Doppler radar can also be implemented in medical applications for remote monitoring and examination. This paper proposes a human respiration rate detection system using micro-Doppler radar with quadrature architecture in the industrial, scientific, and medical (ISM) frequency of 5.8 GHz. We use a mathematical model of human breathing to further explore any insights into signal processes in the radar. The experimental system is designed using the USRP B200 mini-module as the main component of the radar and the Vivaldi antennas working at 5.8 GHz. The radar system is integrated directly with the GNU Radio Companion software as the processing part. Using a frequency of 5.8 GHz and USRP output power of 0.33 mW, our proposed method was able to detect the respiration rate at a distance of 2 m or less with acceptable error. In addition, the radar system could differentiate different frequency rates for different targets, demonstrating that it is highly sensitive. We also emphasize that the designed radar system can be used as a portable device which offers flexibility to be used anytime and anywhere.

scholarly journals A Novel Wireless-Netted UWB Life-Detection Radar System for Quasi-Static Person Sensing

2021 ◽  
Vol 11 (1) ◽  
pp. 424
Author(s):  
Kun Yan ◽  
Shiyou Wu ◽  
Shengbo Ye ◽  
Guangyou Fang
Keyword(s):  
Detection System ◽  
Signal To Noise Ratio ◽  
Observation Point ◽  
Radar System ◽  
Brick Wall ◽  
Efficient Detection ◽  
Human Respiration ◽  
Radar Applications ◽  
Life Detection ◽  
Point Detection

In actual life-detection radar applications, a quasi-static person with weak respiration is difficult to find when relying on the echoes from a single fixed observation point. To effectively sense the weak respiration of a quasi-static person in complex through-wall and through-floor conditions, this paper proposes a novel multi-observation point detection system composed of multiple Golay complementary coded radars in which communication and synchronization are carried out wirelessly. The collaboration structure and Golay complementary coded transmitter improve the signal to noise ratio (SNR). Proof-of-principle experiments are carried out with our designed radar prototype and prove that the radar system can detect a respiring target 21 m behind a brick wall or a respiring target behind two levels of reinforced concrete floors, validating the effectiveness of a multi-observation point working mode for the efficient detection of weak human respiration.

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