Distributed Microwave Photonic MIMO Radar With Accurate Target Position Estimation

A distributed microwave photonic multiple-input multiple-output (MIMO) radar is presented to accurately estimate the two-dimensional (2-D) position of targets. With wavelength-division-multiplexing-based recirculating frequency shifting, mutually orthogonal broadband stepped-frequency chirp (SFC) si...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2023-04, Vol.71 (4), p.1711-1719
Main Authors: Ma, Cong, Cao, Fengting, Yang, Yue, Wang, Xiangchuan, Liu, Xi, Sun, Guanqun, Zhang, Jiangtao, Fu, Jianbin, Pan, Shilong
Format: Article
Language:English
Subjects:
Algorithms
Bandwidth
Bandwidths
Broadband
Echoes
Microwave photonics
MIMO communication
MIMO radar
multiple-input multiple-output (MIMO) radar
Optical receivers
Optical transmitters
position estimation
Radar
Radar cross-sections
stepped-frequency chirp (SFC) signal
Wavelength division multiplexing
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Summary:A distributed microwave photonic multiple-input multiple-output (MIMO) radar is presented to accurately estimate the two-dimensional (2-D) position of targets. With wavelength-division-multiplexing-based recirculating frequency shifting, mutually orthogonal broadband stepped-frequency chirp (SFC) signals can be produced simultaneously, avoiding the complex implementation of a distributed MIMO radar. Microwave photonic dechirping is also performed to process broadband echoes, while a bandwidth synthesis is carried out to fast and accurately estimate the time of arrival (TOA). Thus, 2-D localization can be obtained by a back-projection (BP) algorithm. In a proof-of-concept experiment, a 2\times2 MIMO radar with a bandwidth of 18 GHz is conducted, providing a 1-D ranging error of < \pm 1 mm and a 2-D positioning error of < 1 cm.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2022.3218287