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Photonics-based broadband radar target simulator for generating micro-Doppler signatures.

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    This study introduces a novel photonics-based radar target simulator (RTS) to generate Micro-Doppler (MD) signatures. The system successfully simulated human walking and bird flight MD signatures using X-band radar signals.

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    Area of Science:

    • Radar Systems Engineering
    • Photonics
    • Signal Processing

    Background:

    • Micro-Doppler (MD) signatures enhance radar target detection and identification capabilities.
    • A significant limitation exists in the availability of broadband radar target simulators (RTSs) capable of generating MD signatures.

    Purpose of the Study:

    • To propose and demonstrate a novel photonics-based radar target simulator (RTS).
    • To address the need for broadband RTS capable of generating Micro-Doppler (MD) signatures.

    Main Methods:

    • Modulating the radar under test (RUT) signal onto a broadband optical source.
    • Tailoring optical spectra to simulate micro-motions.
    • Utilizing frequency-to-time mapping to convert optical spectra into simulated echoes for MD signature generation.

    Main Results:

    • Successful generation of MD signatures using a photonics-based RTS.
    • Experimental validation with X-band radar signals (4 GHz bandwidth).
    • Demonstrated simulation of MD signatures for human walking and bird flight.

    Conclusions:

    • The proposed photonics-based RTS is effective in generating complex MD signatures.
    • This technology advances the development of radar systems for target identification.
    • Enables realistic simulation of micro-motions for radar testing and development.