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A low-cost through-the-wall FMCW radar for stand-off operation and activity detection

Chetty, K; Chen, Q; Woodbridge, K; Ritchie, M; (2017) A low-cost through-the-wall FMCW radar for stand-off operation and activity detection. In: Ranney, KI and Doerry, A, (eds.) Radar Sensor Technology XXI. Society of Photo-Optical Instrumentation Engineers (SPIE): Anaheim, CA, USA. Green open access

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Abstract

In this paper we present a new through-wall (TW) FMCW radar system. The architecture of the radar enables both high sensitivity and range resolutions of <1.5 m. Moreover, the radar employs moving target indication (MTI) signal processing to remove the problematic primary wall reflection, allowing higher signal-to- noise and signal-to-interference ratios, which can be traded-off for increased operational stand-off. The TW radar operates at 5.8 GHz with a 200 MHz bandwidth. Its dual-frequency design minimises interference from signal leakage, and permits a baseband output after deramping which is digitized using an inexpensive 24-bit off-the-shelf sound card. The system is therefore an order of magnitude lower in cost than competitor ultrawideband (UWB) TW systems. The high sensitivity afforded by this wide dynamic range has allowed us to develop a wall removal technique whereby high-order digital filters provide a flexible means of MTI filtering based on the phases of the returned echoes. Experimental data demonstrates through-wall detection of individuals and groups of people in various scenarios. Target positions were located to within ±1.25 m in range, allowing us distinguish between two closely separated targets. Furthermore, at 8.5 m standoff, our wall removal technique can recover target responses that would have otherwise been masked by the primary wall reflection, thus increasing the stand-off capability of the radar. Using phase processing, our experimental data also reveals a clear difference in the micro-Doppler signatures across various types of everyday actions.

Type: Proceedings paper
Title: A low-cost through-the-wall FMCW radar for stand-off operation and activity detection
Event: Radar Sensor Technology XXI
Location: Anaheim, California, USA
Dates: 09 April 2017 - 13 April 2017
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2261680
Publisher version: http://dx.doi.org/10.1117/12.2261680
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Through-wall radar, FMCW radar, micro-Doppler, moving target indication
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1535165
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