340-GHz 3D radar imaging test bed with 10-Hz frame rate

Robertson, Duncan A.; Marsh, Paul N.; Bolton, David R.; Middleton, Richard H.; Hunter, Robert I.; Speirs, Peter J.; Macfarlane, D. G.; Cassidy, Scott L.; Smith, Graham

doi:10.1117/12.918581

Cited by 41 publications

(22 citation statements)

References 7 publications

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“…Transmit-receive duplexing and co-and cross-polar receive separation are achieved with a quasi-optical duplexer based on wire grid polarisers and a ferrite Faraday rotator [12,6]. This offers excellent performance in terms of low insertion loss and high isolation over wide bandwidths at the expense of physical size when compared with waveguide circuits.…”

Section: Irad 340 Ghz Radarmentioning

confidence: 99%

“…Most submillimetre wave radars make use of solid-state frequency multiplier chains [3,4,5,6,7], exploiting both MMIC and Schottky diode technologies, to generate transmit powers which are typically in the milliwatt class. When combined with sensitive heterodyne or homodyne receivers, these radars can achieve high dynamic ranges.…”

Section: Overview Of Submillimetre Wave Radarmentioning

confidence: 99%

“…We developed the IRAD 340 GHz radar [6] for stand-off applications at 20+ m range. It uses a coherent heterodyne architecture with separate Schottky diode multiplier chains for transmit (x48) and local oscillator (x24) signals.…”

Section: Irad 340 Ghz Radarmentioning

confidence: 99%

“…The final technological aspect of IRAD which enables high frame rates is a high speed FMCW radar signal processing software architecture which exploits parallel processing on multi-core CPUs and hardware graphics routines on running on GPU hardware [6,11]. The incoming data stream from the data acquisition hardware is buffered and parallelised between multiple processing threads (proportional to the number of CPU cores) which undertake FFTs on each 3D image frame.…”

Section: Irad 340 Ghz Radarmentioning

confidence: 99%

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Submillimetre wave 3D imaging radar for security applications

Robertson¹,

Macfarlane²,

Cassidy³

et al. 2016

IET Colloquium on Millimetre-Wave and Terahertz Engineering [Amp ] Technology 2016

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There is ongoing worldwide interest in finding solutions to enhance the security of civilians at airports, borders and high risk public areas in ways which are safe, ethical and streamlined. One promising approach is to use submillimetre wave 3D imaging radar to detect concealed threats as it offers the advantages of high volumetric resolution (~1 cm3) with practically sized antennas (<0.5 m) such that even quite small objects can be resolved through clothing. The Millimetre Wave Group at the University of St Andrews has been developing submillimetre wave 3D imaging radars for security applications since 2007. A significant goal is to achieve near real-time frame rates of at least 10 Hz, to cope with dynamic scenes, over wide fields of view at short range with high pixel counts. We review the radar systems we have developed at 340 and 220 GHz and the underpinning technologies which we have employed to realise these goals.

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Section: Irad 340 Ghz Radarmentioning

confidence: 99%

Section: Overview Of Submillimetre Wave Radarmentioning

confidence: 99%

Section: Irad 340 Ghz Radarmentioning

confidence: 99%

Section: Irad 340 Ghz Radarmentioning

confidence: 99%

See 2 more Smart Citations

Submillimetre wave 3D imaging radar for security applications

Robertson¹,

Macfarlane²,

Cassidy³

et al. 2016

IET Colloquium on Millimetre-Wave and Terahertz Engineering [Amp ] Technology 2016

View full text Add to dashboard Cite

show abstract

“…Polarising interferometers may also be used such as the Martin-Puplett interferometer and the frequency-selective polariser (FSP) based duplexer [16]. For frequencies up to about 350 GHz non-reciprocal free-space Faraday rotators made with permanently magnetised hexaferrite materials offer good isolation with low loss and if configured well can achieve very low leakage, for example -80 dB at 340 GHz [17]. Fig.…”

Section: Duplexingmentioning

confidence: 99%