title: Searching for Survivors through Random Human-Body Movement Outdoors by Continuous-Wave Radar Array.
abstract: It is a major challenge to search for survivors after chemical or nuclear leakage or explosions. At present, biological radar can be used to achieve this goal by detecting the survivor's respiration signal. However, owing to the random posture of an injured person at a rescue site, the radar wave may directly irradiate the person's head or feet, in which it is difficult to detect the respiration signal. This paper describes a multichannel-based antenna array technology, which forms an omnidirectional detection system via 24-GHz Doppler biological radar, to address the random positioning relative to the antenna of an object to be detected. Furthermore, since the survivors often have random body movement such as struggling and twitching, the slight movements of the body caused by breathing are obscured by these movements. Therefore, a method is proposed to identify random human-body movement by utilizing multichannel information to calculate the background variance of the environment in combination with a constant-false-alarm-rate detector. The conducted outdoor experiments indicate that the system can realize the omnidirectional detection of random human-body movement and distinguish body movement from environmental interference such as movement of leaves and grass. The methods proposed in this paper will be a promising way to search for survivors outdoors.
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Chuantao
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Fuming
authors.initials: F
authors.lastname: Chen
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Fugui
authors.initials: F
authors.lastname: Qi
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Miao
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Fulai
authors.initials: F
authors.lastname: Liang
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Xijing
authors.initials: X
authors.lastname: Jing
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.
authors.forename: Guohua
authors.initials: G
authors.lastname: Lu
authors.affiliation: Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China.|Shaanxi University of Technology, Hanzhong, China.
authors.forename: Jianqi
authors.initials: J
authors.lastname: Wang
mesh_terms: D000062:Accidents, Occupational; D055884:Chemical Hazard Release; D006801:Humans; D009068:Movement; D011825:Radar / Q000295:instrumentation*; D018788:Radioactive Hazard Release; D018635:Rescue Work / Q000379:methods*; D017741:Survivors