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    Area of Science:

    • Optics and Photonics
    • Remote Sensing
    • Signal Processing

    Background:

    • Doppler tomography is crucial for 2-D imaging of spinning targets like space debris and aircraft blades.
    • Current research primarily uses microwave frequencies, limiting resolution and struggling with extended target echoes.
    • Existing methods are often designed for point targets, yielding unsatisfactory image quality for extended objects.

    Purpose of the Study:

    • To introduce a novel laser Doppler tomography method for high-resolution imaging of extended spinning targets.
    • To overcome the resolution and image quality limitations of existing microwave-based Doppler tomography techniques.
    • To demonstrate the effectiveness of a single-frequency laser radar (LADAR) system for advanced target imaging.

    Main Methods:

    • Developed a laser Doppler tomography method using a single-frequency laser radar (LADAR) without wideband modulation.
    • Employed the relationship between target scattering coefficient and Doppler spectrum characteristics for imaging.
    • Utilized maximum a posteriori (MAP) estimation to determine the scattering coefficient distribution.

    Main Results:

    • Achieved high-quality laser Doppler tomograms of extended targets, a first in experimental validation.
    • Obtained images with 0.4 mm resolution at 5 meters for targets rotating between 100-1000 r/min.
    • Demonstrated superior image quality, rendering surface textures and significantly improving upon existing methods.

    Conclusions:

    • The proposed laser Doppler tomography method offers superior resolution, exceeding the diffraction limit and independent of imaging distance.
    • This technique successfully images extended targets with high fidelity, significantly advancing Doppler tomography applications.
    • Experimental results validate the method's effectiveness for detailed remote sensing of spinning objects.