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.
Highlights
Chemical agents and nuclear radiation causing long-term health hazards can potentially be utilized by terrorists [1]
This paper decribes a new application of a 24 GHz respiration radar sensor and methods for non-contact detection of the vital signs of human subjects
A compact 24 GHz Doppler radar combined with suitable signal conditioning circuits can detect human respiration signals
Summary
Chemical agents and nuclear radiation causing long-term health hazards can potentially be utilized by terrorists [1]. Thermal cameras can judge whether the human body has vital signs, but they are expensive and suffer easy interference from the environment To address this issue in this paper a new small compact and compatible sensor for remotely sensing vital signs is presented. One reason for gathering physiological parameters at a distance in a non-contacting and non-invasive way is that the technique can be applied to medical treatment [7], safety, lie detection, the military field and searching for survivors. Facing a new application and new problems, this paper designs a kind of compact and portable CW radar system for detecting the respiration signals of the human body in a non-contacting way at a long distance
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