Cylindrical MIMO Array-Based Near-Field Microwave Imaging

Microwave/millimeter-wave imaging has a wide prospect in applications of concealed weapons detection. The main problem of the existing techniques lies in the contradiction between the imaging speed and the system cost. In this respect, a cylindrical sparse multiple-input-multiple-output (MIMO) array...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-01, Vol.69 (1), p.612-617
Main Authors: Li, Shiyong, Wang, Shuoguang, An, Qiang, Zhao, Guoqiang, Sun, Houjun
Format: Article
Language:English
Subjects:
Algorithms
Antenna arrays
Apertures
Arrays
Calibration
Concealed weapons detection
Error analysis
Image reconstruction
Imaging
Microwave imaging
Millimeter waves
MIMO communication
monostatic
multiple-input–multiple-output (MIMO) array
multistatic
Phase transitions
Receiving antennas
Sampling
Topology
Transmitting antennas
Wavelengths
wavenumber domain algorithm
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Description
Summary:Microwave/millimeter-wave imaging has a wide prospect in applications of concealed weapons detection. The main problem of the existing techniques lies in the contradiction between the imaging speed and the system cost. In this respect, a cylindrical sparse multiple-input-multiple-output (MIMO) array topology is proposed, which has no mechanical scanning so as to achieve fast sampling process. Furthermore, it can provide more angular observations than the mainly used systems with a planar aperture. To speed up the image reconstruction process, a phase center approximation-based transformation is made to convert the multistatic sampling scheme to its monostatic counterpart for which there are more fast and tractable imaging algorithms. Then, a phase calibration method is presented after we analyze the error of such an equivalence. In so doing, the cylindrical MIMO topology is transformed into an approximate monostatic one. Finally, a wavenumber domain algorithm is employed to attain the fast image reconstruction. Numerical simulations are provided to demonstrate the performance improvement of the proposed technique.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2020.3001438