TY  - GEN
A1  - Chen, Q
A1  - Chetty, K
A1  - Brennan, P
A1  - Lok, L
T3  - Proceedings of SPIE
KW  - Multiple Input Multiple Output Radar
KW  -  Phase Array
KW  -  Radar Imaging
KW  -  Through Wall
KW  -  Time-Duplexed radar
CY  - Anaheim, CA, USA
PB  - Society of Photo-Optical Instrumentation Engineers (SPIE)
UR  - http://dx.doi.org/10.1117/12.2262462
SN  - 0277-786X
N2  - 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.
ID  - discovery1534616
N1  - This version is the version of record. For information on re-use, please refer to the publisher?s terms and conditions.
Y1  - 2017/05/01/
AV  - public
TI  - A Coherent Through-Wall MIMO Phased Array Imaging Radar based on Time-Duplexed Switching
ER  -