Single Channel Microwave Photonics Digital Beamforming Radar Imaging System

We propose and demonstrate the first single channel real-time microwave photonics digital beamforming radar imaging system based on a silica photonics summator. Considering a set of microwave signals received by an antenna array, the number of receiving chains is concentrated into a single channel b...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 36; no. 3; pp. 675 - 681
Main Authors Tegegne, Zerihun Gedeb, Decroze, Cyril, Di Bin, Philippe, Fromenteze, Thomas, Aupetit-Berthelemot, Christelle
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Institute of Electrical and Electronics Engineers (IEEE)/Optical Society of America(OSA)
Subjects
Analog to digital conversion
Analog to digital converters
Array signal processing
Beamforming
Demultiplexing
Digital beamforming
Digital imaging
Division
Electromagnetism
Engineering Sciences
High-speed optical techniques
Microwave antenna arrays
Microwave photonics
Multiplexing
Optical communication
Optical fibers
Photonics
photonics beamforming
photonics multiplexer
photonics summator
Radar
Radar imaging
Signal and Image processing
Silicon dioxide
Time lag
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Summary:We propose and demonstrate the first single channel real-time microwave photonics digital beamforming radar imaging system based on a silica photonics summator. Considering a set of microwave signals received by an antenna array, the number of receiving chains is concentrated into a single channel by achieving an analog time-division multiplexing of radio frequency modulated optical signals using well-calculated optical fiber lengths and a microwave photonics summator. This single channel output guarantees a simplified architecture and minimizes the required number of analog-to-digital converters. A fixed fiber length difference is implemented to introduce a true time delay between each channel in order to time interleave them. The image of the scenes is then retrieved by demultiplexing the received signal and applying digital beamforming techniques. The potential applications of this structure are to implement in a short-range radar imaging system.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2017.2775661