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Signs of life detection using wireless passive radar

Chen, Q; Chetty, K; Woodbridge, K; Tan, B; (2016) Signs of life detection using wireless passive radar. In: Proceedings of the 2016 IEEE Radar Conference (RadarConf). IEEE: Philadelphia, PA, USA. Green open access

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Abstract

Non-contact devices for monitoring signs of life have attracted a lot of attention in recent years for applications in security, emergency and disaster situations. Current devices however, generally utilize bespoke active systems to transmit large bandwidth signals. In this paper, a real-Time phase extraction method based on passive Wi-Fi radar is proposed for detecting the chest movements associated with a person breathing. Since the monitored movements are of low amplitude and small Doppler shift, this method uses the phase variation rather than traditional range-Doppler processing. The processing is based on time domain cross correlation, with the addition of a Hampel filter for outlier detection and removal. In this paper the basic passive Wi-Fi model and limitations of traditional cross ambiguity function for signs of life detection are first introduced. The phase extraction method is then described followed by experimental results and analysis. Detection of breathing for a stationary person is shown in both in-room and through wall scenarios using both the Wi-Fi beacon and data transmissions. This is believed to be the first demonstration of signs of life detection using phase extraction in passive radar and extends the capability of such systems into a wide range of new applications.

Type: Proceedings paper
Title: Signs of life detection using wireless passive radar
Event: 2016 IEEE Radar Conference (RadarConf)
ISBN-13: 9781509008636
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/RADAR.2016.7485313
Publisher version: http://dx.doi.org/10.1109/RADAR.2016.7485313
Language: English
Additional information: Copyright © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Keywords: Antenna arrays, Correlation, IEEE 802.11 Standard, Passive radar, Radar detection, Real-time systems
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Security and Crime Science
URI: https://discovery.ucl.ac.uk/id/eprint/1492847
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