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Millimeter-level resolution through-the-wall radar imaging enabled by an optically injected semiconductor laser.

Guanqun Sun, Fangzheng Zhang, Shilong Pan

    Optics Letters
    |November 15, 2021
    PubMed
    Summary

    This study demonstrates millimeter-level resolution through-the-wall radar imaging using a novel nonlinear frequency-modulated (NLFM) signal generated by a semiconductor laser. The advanced NLFM signal enables enhanced radar imaging quality and side-lobe suppression.

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    Area of Science:

    • Radar Systems Engineering
    • Optoelectronics
    • Signal Processing

    Background:

    • Traditional through-the-wall radar (TWR) imaging faces limitations in achieving high resolution.
    • Generating broadband signals, crucial for high resolution, is challenging with conventional methods.

    Purpose of the Study:

    • To demonstrate millimeter-level resolution TWR imaging.
    • To develop a novel method for generating broadband nonlinear frequency-modulated (NLFM) signals for radar applications.

    Main Methods:

    • Utilized an optically injected semiconductor laser exhibiting period-one dynamics.
    • Employed an optical frequency downconversion technique to generate broadband NLFM signals.
    • Implemented a modified back projection imaging algorithm with sub-aperture weighting.

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    Main Results:

    • Successfully generated an NLFM signal with an 18.5 GHz bandwidth (1.5–20 GHz).
    • Achieved a radar range resolution of 8.1 mm.
    • Demonstrated effective side-lobe suppression during pulse compression in TWR imaging.

    Conclusions:

    • The proposed optically generated NLFM signal enables high-resolution TWR imaging.
    • The method overcomes limitations of traditional period-one oscillations for broadband signal generation.
    • The modified imaging algorithm enhances overall image quality.