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Multi-band reconfigurable microwave photonic transceiver towards high-performance integrated radar.

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    Microwave photonic radars overcome electronic limits, but face trade-offs. This study introduces a new photonic transceiver using synchronized lasers for high resolution and multi-band radar, improving performance.

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    Area of Science:

    • Photonics
    • Radar Systems Engineering
    • Electrical Engineering

    Background:

    • Conventional electrical radars face electronic bottlenecks limiting perception and recognition.
    • Current photonic radars exhibit trade-offs between reconfigurability, signal time-bandwidth product (TBWP), linearity, and phase coherence.
    • These limitations hinder the overall performance of existing photonic radar systems.

    Purpose of the Study:

    • To propose and demonstrate a novel photonic transceiver architecture to overcome the limitations of current photonic radars.
    • To achieve high resolution and multi-band reconfigurability in a single photonic radar system.
    • To enhance linearity and phase coherence for improved radar performance.

    Main Methods:

    • Development of a photonic transceiver based on electrically assisted synchronized lasers.
    • Implementation of optical coherent heterodyne linear frequency-modulated (LFM) radar signal generation using synchronized lasers.
    • Photonic dechirping reception utilizing synchronized lasers at the receiver.

    Main Results:

    • Demonstration of reconfigurable LFM signals across L- to Ka-bands with enhanced linearity and phase coherence.
    • Operation in the Ka-band with an ultra-large signal TBWP of 4×10^6.
    • Achieved range resolution of 1.92 cm and ISAR imaging resolution of 1.92 cm × 1.89 cm with a low receiver sampling rate of 5 MSa/s.

    Conclusions:

    • The proposed photonic transceiver effectively combines high resolution and multi-band reconfigurability.
    • The system demonstrates significant improvements in linearity, phase coherence, and signal TBWP.
    • The simple structure, flexible reconfiguration, and integration compatibility offer potential for next-generation miniaturized radar applications.