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Proceedings Paper

A coherent through-wall MIMO phased array imaging radar based on time-duplexed switching
Author(s): Qingchao Chen; Kevin Chetty; Paul Brennan; Lai Bun Lok; Matthiew Ritchie; Karl Woodbridge
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Paper 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.

Paper Details

Date Published: 1 May 2017
PDF: 11 pages
Proc. SPIE 10188, Radar Sensor Technology XXI, 1018809 (1 May 2017); doi: 10.1117/12.2262462
Show Author Affiliations
Qingchao Chen, Univ. College London (United Kingdom)
Kevin Chetty, Univ. College London (United Kingdom)
Paul Brennan, Univ. College London (United Kingdom)
Lai Bun Lok, Univ. College London (United Kingdom)
Matthiew Ritchie, Defense Science and Technology Lab. (United Kingdom)
Karl Woodbridge, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 10188:
Radar Sensor Technology XXI
Kenneth I. Ranney; Armin Doerry, Editor(s)

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