?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=A+Coherent+Through-Wall+MIMO+Phased+Array+Imaging+Radar+based+on+Time-Duplexed+Switching&rft.creator=Chen%2C+Q&rft.creator=Chetty%2C+K&rft.creator=Brennan%2C+P&rft.creator=Lok%2C+L&rft.description=Through-the-Wall+(TW)+radar+sensors+are+gaining+increasing+interest+for+security%2C+surveillance+and+search+and+rescue+applications.+Additionally%2C+the+integration+of+Multiple-Input%2C+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%2C+the+4+Tx+and+4+Rx+elements+are+used+to+synthesize+a+uniform+linear+array+(ULA)+of+16+virtual+elements.+Furthermore%2C+the+transmitter+is+based+on+a+single-channel+4-element+time-multiplexed+switched+array.+In+transmission%2C+the+radar+utilizes+frequency+modulated+continuous+wave+(FMCW)+waveforms+that+undergo+de-ramping+on+receive+to+allow+digitization+at+relatively+low+sampling+rates%2C+which+then+simplifies+the+imaging+process.+This+architecture+has+been+designed+for+the+short-range+TW+scenarios+envisaged%2C+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%2C+we+report+results+from+an+experimental+campaign+that+investigated+the+imaging+capabilities+of+the+system+and+demonstrated+the+detection+of+personnel+targets.+Moreover%2C+we+show+that+multiple+targets+within+a+room+with+greater+than+approximately+1+meter+separation+can+be+distinguished+from+one+another.&rft.subject=Multiple+Input+Multiple+Output+Radar%2C+Phase+Array%2C+Radar+Imaging%2C+Through+Wall%2C+Time-Duplexed+radar&rft.publisher=Society+of+Photo-Optical+Instrumentation+Engineers+(SPIE)&rft.contributor=Ranney%2C+KI&rft.contributor=Doerry%2C+A&rft.date=2017-05-01&rft.type=Proceedings+paper&rft.publisher=Defense+%2B+Security&rft.language=eng&rft.source=+++++In%3A+Ranney%2C+KI+and+Doerry%2C+A%2C+(eds.)+Radar+Sensor+Technology+XXI.++++Society+of+Photo-Optical+Instrumentation+Engineers+(SPIE)%3A+Anaheim%2C+CA%2C+USA.+(2017)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1534616%2F1%2FChen_1018809.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1534616%2F&rft.rights=open