A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging

A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging

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 t...

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Bibliographic Details
Main Authors: Xiangzhou Guo, Muhammad Asif, Anyong Hu, Zhiping Li, Jungang Miao
Format: Article
Language:English
Published: MDPI AG 2019-04-01
Series:Sensors
Subjects:
interferometry
aperture synthesis
security screening
cross correlator
1-bit
comparator
FPGA
Online Access:https://www.mdpi.com/1424-8220/19/7/1739
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spelling doaj-cea21a588f084bc4b696bc9f8c1a39de2020-11-24T21:53:47ZengMDPI AGSensors1424-82202019-04-01197173910.3390/s19071739s19071739A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis ImagingXiangzhou Guo0Muhammad Asif1Anyong Hu2Zhiping Li3Jungang Miao4School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, ChinaSchool of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, ChinaSchool of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, ChinaSchool of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, ChinaSchool of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, ChinaWe 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.https://www.mdpi.com/1424-8220/19/7/1739interferometryaperture synthesissecurity screeningcross correlator1-bitcomparatorFPGA
collection DOAJ
language English
format Article
sources DOAJ
author Xiangzhou Guo
Muhammad Asif
Anyong Hu
Zhiping Li
Jungang Miao
spellingShingle Xiangzhou Guo
Muhammad Asif
Anyong Hu
Zhiping Li
Jungang Miao
A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
Sensors
interferometry
aperture synthesis
security screening
cross correlator
1-bit
comparator
FPGA
author_facet Xiangzhou Guo
Muhammad Asif
Anyong Hu
Zhiping Li
Jungang Miao
author_sort Xiangzhou Guo
title A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
title_short A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
title_full A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
title_fullStr A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
title_full_unstemmed A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging
title_sort 1-ghz 64-channel cross-correlation system for real-time interferometric aperture synthesis imaging
publisher MDPI AG
series Sensors
issn 1424-8220
publishDate 2019-04-01
description 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.
topic interferometry
aperture synthesis
security screening
cross correlator
1-bit
comparator
FPGA
url https://www.mdpi.com/1424-8220/19/7/1739
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