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Sensors 2019, 19(7), 1739; https://doi.org/10.3390/s19071739

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

School of Electronic Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing 100191, China
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Received: 8 March 2019 / Revised: 4 April 2019 / Accepted: 6 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Radar and Radiometric Sensors and Sensing)
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Abstract

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. View Full-Text
Keywords: interferometry; aperture synthesis; security screening; cross correlator; 1-bit; comparator; FPGA interferometry; aperture synthesis; security screening; cross correlator; 1-bit; comparator; FPGA
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Guo, X.; Asif, M.; Hu, A.; Li, Z.; Miao, J. A 1-GHz 64-Channel Cross-Correlation System for Real-Time Interferometric Aperture Synthesis Imaging. Sensors 2019, 19, 1739.

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