Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 19, Pages 5450-5484Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.2993166
Keywords
Radars; microwave photonics; LO generation; waveform generation; mixing; filtering; analog-to-digital conversion; beamforming; interference cancellation; analog signal processing; synthetic aperture; radar imaging; photonic integration
Funding
- National Key R&D Program of China [2018YFB2201803]
- National Natural Science Foundation of China [61901215, 61527820]
- Fundamental Research Funds for the Central Universities
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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since itwas invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.
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