PMID- 30978993
OWN - NLM
STAT- MEDLINE
DCOM- 20190809
LR  - 20200225
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 19
IP  - 7
DP  - 2019 Apr 11
TI  - A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric 
      Aperture Synthesis Imaging.
LID - 10.3390/s19071739 [doi]
LID - 1739
AB  - We present a 64-channel 1-bit/2-level cross-correlation system for a passive 
      millimeter wave imager used for indoor human body security screening. Sixty-four 
      commercial comparators are used to perform 1-bit analog-to-digital conversion, 
      and a Field Programmable Gate Array (FPGA) is used to perform the 
      cross-correlation processing. This system can handle 2016 cross-correlations at 
      the sample frequency of 1GHz, and its power consumption is 48.75 W. The data 
      readout interface makes it possible to read earlier data while simultaneously 
      performing the next correlation when imaging at video rate. The longest 
      integration time is up to 68.7 s, which can satisfy the requirements of video 
      rate imaging and system calibration. The measured crosstalk between neighboring 
      channels is less than 0.068%, and the stability is longer than 10 s. A 
      correlation efficiency greater than 96% is achieved for input signal levels 
      greater than -25 dBm.
FAU - Guo, Xiangzhou
AU  - Guo X
AD  - School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan 
      Road, Haidian District, Beijing 100191, China. xiangzhou.guo@outlook.com.
FAU - Asif, Muhammad
AU  - Asif M
AD  - School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan 
      Road, Haidian District, Beijing 100191, China. m.asif.bhatti@gmail.com.
FAU - Hu, Anyong
AU  - Hu A
AD  - School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan 
      Road, Haidian District, Beijing 100191, China. hu_anyong@buaa.edu.cn.
FAU - Li, Zhiping
AU  - Li Z
AD  - School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan 
      Road, Haidian District, Beijing 100191, China. zhiping_li@buaa.edu.cn.
FAU - Miao, Jungang
AU  - Miao J
AD  - School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan 
      Road, Haidian District, Beijing 100191, China. jmiaobremen@buaa.edu.cn.
LA  - eng
GR  - 2016YFC0800401/Ministry of Science and Technology of the People's Republic of 
      China/
PT  - Journal Article
DEP - 20190411
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
MH  - *Analog-Digital Conversion
MH  - Gun Violence/*prevention & control
MH  - *Human Body
MH  - Humans
MH  - Image Enhancement/methods
MH  - Image Interpretation, Computer-Assisted/methods
MH  - Interferometry/*methods
MH  - Models, Theoretical
MH  - Phantoms, Imaging
MH  - Security Measures/trends
MH  - Signal Processing, Computer-Assisted/instrumentation
PMC - PMC6480425
OTO - NOTNLM
OT  - 1-bit
OT  - FPGA
OT  - aperture synthesis
OT  - comparator
OT  - cross correlator
OT  - interferometry
OT  - security screening
COIS- The authors declare no conflict of interest.
EDAT- 2019/04/14 06:00
MHDA- 2019/08/10 06:00
PMCR- 2019/04/01
CRDT- 2019/04/14 06:00
PHST- 2019/03/08 00:00 [received]
PHST- 2019/04/04 00:00 [revised]
PHST- 2019/04/06 00:00 [accepted]
PHST- 2019/04/14 06:00 [entrez]
PHST- 2019/04/14 06:00 [pubmed]
PHST- 2019/08/10 06:00 [medline]
PHST- 2019/04/01 00:00 [pmc-release]
AID - s19071739 [pii]
AID - sensors-19-01739 [pii]
AID - 10.3390/s19071739 [doi]
PST - epublish
SO  - Sensors (Basel). 2019 Apr 11;19(7):1739. doi: 10.3390/s19071739.