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A Method for Remotely Sensing Vital Signs of Human Subjects Outdoors.

Li C, Chen F, Jin J, Lv H, Li S, Lu G, Wang J - Sensors (Basel) (2015)

Bottom Line: Although human bodies can be found by smart vehicles and drones equipped with cameras, it is difficult to verify if the person is alive or dead this way.Finally, the detection capabilities of the radar system and the signal processing method are verified through experiments which show that human respiration signals can be extracted when the subject is 7 m away outdoors.The method provided in this paper will be a promising way to search for human subjects outdoors.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an 710032, China. lichuantao614@126.com.

ABSTRACT
After chemical or nuclear leakage or explosions, finding survivors is a huge challenge. Although human bodies can be found by smart vehicles and drones equipped with cameras, it is difficult to verify if the person is alive or dead this way. This paper describes a continuous wave radar sensor for remotely sensing the vital signs of human subjects. Firstly, a compact and portable 24 GHz Doppler radar system is designed to conduct non-contact detection of respiration signal. Secondly, in order to improve the quality of the respiration signals, the self-correlation and adaptive line enhancer (ALE) methods are proposed to minimize the interferences of any moving objects around the human subject. Finally, the detection capabilities of the radar system and the signal processing method are verified through experiments which show that human respiration signals can be extracted when the subject is 7 m away outdoors. The method provided in this paper will be a promising way to search for human subjects outdoors.

No MeSH data available.


Related in: MedlinePlus

(a) Respiration waveforms obtained from the radar and its frequency spectrum; (b) Respiration waveforms obtained from the respiratory belt and its frequency spectrum.
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sensors-15-14830-f007: (a) Respiration waveforms obtained from the radar and its frequency spectrum; (b) Respiration waveforms obtained from the respiratory belt and its frequency spectrum.

Mentions: The first indoor experiment scenario was described next. The subjects wearing the RBT lie on a cushion, and the radar is 1 m away from their body. We place the radar on the ground, at the same height as the abdomen of the human body, and make the radar antenna directly face the human body. Respiration waveforms measured by the radar system and frequency spectrum are shown in Figure 7a. The respiration waveforms measured by the radar system and frequency spectrum are shown in Figure 7b. Prominent peaks of the two spectra are the same under the frequency accuracy of 2048 Fast Fourier Transform points with 40 Hz sample frequency.


A Method for Remotely Sensing Vital Signs of Human Subjects Outdoors.

Li C, Chen F, Jin J, Lv H, Li S, Lu G, Wang J - Sensors (Basel) (2015)

(a) Respiration waveforms obtained from the radar and its frequency spectrum; (b) Respiration waveforms obtained from the respiratory belt and its frequency spectrum.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541809&req=5

sensors-15-14830-f007: (a) Respiration waveforms obtained from the radar and its frequency spectrum; (b) Respiration waveforms obtained from the respiratory belt and its frequency spectrum.
Mentions: The first indoor experiment scenario was described next. The subjects wearing the RBT lie on a cushion, and the radar is 1 m away from their body. We place the radar on the ground, at the same height as the abdomen of the human body, and make the radar antenna directly face the human body. Respiration waveforms measured by the radar system and frequency spectrum are shown in Figure 7a. The respiration waveforms measured by the radar system and frequency spectrum are shown in Figure 7b. Prominent peaks of the two spectra are the same under the frequency accuracy of 2048 Fast Fourier Transform points with 40 Hz sample frequency.

Bottom Line: Although human bodies can be found by smart vehicles and drones equipped with cameras, it is difficult to verify if the person is alive or dead this way.Finally, the detection capabilities of the radar system and the signal processing method are verified through experiments which show that human respiration signals can be extracted when the subject is 7 m away outdoors.The method provided in this paper will be a promising way to search for human subjects outdoors.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an 710032, China. lichuantao614@126.com.

ABSTRACT
After chemical or nuclear leakage or explosions, finding survivors is a huge challenge. Although human bodies can be found by smart vehicles and drones equipped with cameras, it is difficult to verify if the person is alive or dead this way. This paper describes a continuous wave radar sensor for remotely sensing the vital signs of human subjects. Firstly, a compact and portable 24 GHz Doppler radar system is designed to conduct non-contact detection of respiration signal. Secondly, in order to improve the quality of the respiration signals, the self-correlation and adaptive line enhancer (ALE) methods are proposed to minimize the interferences of any moving objects around the human subject. Finally, the detection capabilities of the radar system and the signal processing method are verified through experiments which show that human respiration signals can be extracted when the subject is 7 m away outdoors. The method provided in this paper will be a promising way to search for human subjects outdoors.

No MeSH data available.


Related in: MedlinePlus