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A Coherent Through-Wall MIMO Phased Array Imaging Radar based on Time-Duplexed Switching

Chen, Q; Chetty, K; Brennan, P; Lok, L; (2017) A Coherent Through-Wall MIMO Phased Array Imaging Radar based on Time-Duplexed Switching. 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

Through-the-Wall (TW) radar sensors are gaining increasing interest for security, surveillance and search and rescue applications. Additionally, the integration of Multiple-Input, Multiple-Output (MIMO) techniques with phased array radar is allowing higher performance at lower cost. In this paper we present a 4-by-4 TW MIMO phased array imaging radar operating at 2.4 GHz with 200 MHz bandwidth. To achieve high imaging resolution in a cost-effective manner, the 4 Tx and 4 Rx elements are used to synthesize a uniform linear array (ULA) of 16 virtual elements. Furthermore, the transmitter is based on a single-channel 4-element time-multiplexed switched array. In transmission, the radar utilizes frequency modulated continuous wave (FMCW) waveforms that undergo de-ramping on receive to allow digitization at relatively low sampling rates, which then simplifies the imaging process. This architecture has been designed for the short-range TW scenarios envisaged, and permits sufficient time to switch between antenna elements. The paper first outlines the system characteristics before describing the key signal processing and imaging algorithms which are based on traditional Fast Fourier Transform (FFT) processing. These techniques are implemented in LabVIEW software. Finally, we report results from an experimental campaign that investigated the imaging capabilities of the system and demonstrated the detection of personnel targets. Moreover, we show that multiple targets within a room with greater than approximately 1 meter separation can be distinguished from one another.

Type: Proceedings paper
Title: A Coherent Through-Wall MIMO Phased Array Imaging Radar based on Time-Duplexed Switching
Event: Defense + Security 2017 Conference
Location: Anaheim, US
Dates: 09 April 2017 - 13 April 2017
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2262462
Publisher version: http://dx.doi.org/10.1117/12.2262462
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: Multiple Input Multiple Output Radar, Phase Array, Radar Imaging, Through Wall, Time-Duplexed radar
UCL classification: 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/1534616
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