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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Scalable distributed microwave photonic MIMO radar based on a bidirectional ring network.

Qiang Sun, Jingwen Dong, Chenyu Liu

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    A scalable distributed microwave photonic multiple-input-multiple-output (MIMO) radar uses a bidirectional ring network for enhanced large-scale deployment. This system achieves precise 2D target localization and velocity measurements.

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    Area of Science:

    • Microwave Photonics
    • Radar Systems Engineering
    • Optical Network Design

    Background:

    • Traditional radar systems face limitations in scalability and distribution for large-scale applications.
    • Microwave photonics offers a promising avenue for developing advanced radar architectures.
    • Distributed radar systems require robust and scalable network infrastructures.

    Purpose of the Study:

    • To propose and demonstrate a scalable distributed microwave photonic multiple-input-multiple-output (MIMO) radar system.
    • To leverage a bidirectional fiber ring network for enhanced radar signal distribution and processing.
    • To validate the system's feasibility for accurate two-dimensional target detection.

    Main Methods:

    • Implementation of a bidirectional fiber ring network connecting local and remote nodes.
    • Generation of radar signals using external modulation at different optical wavelengths.
    • Utilizing wavelength-division multiplexing for signal transmission to remote nodes.
    • Employing photonic de-chirp processing in remote nodes for signal analysis.
    • Demonstration via a proof-of-concept experiment.

    Main Results:

    • Successful demonstration of a scalable distributed microwave photonic MIMO radar system.
    • Realization of two-dimensional position and velocity measurements of targets.
    • Achieved position error better than 8 cm.
    • Achieved velocity error better than 0.20 m/s.

    Conclusions:

    • The proposed bidirectional ring network enables a scalable and distributed microwave photonic MIMO radar.
    • The system architecture enhances scalability through pluggable remote nodes.
    • The experimental results confirm the system's effectiveness for accurate target tracking.