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Spatial and temporal domain filtering for underwater lidar.

Austin Jantzi, William Jemison, David Illig

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |October 6, 2021
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    Summary

    This study combines spatial and temporal processing to improve underwater light detection and ranging (lidar) performance. The novel approach significantly reduces scattering effects, enhancing system capabilities beyond individual methods.

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    Area of Science:

    • Optical engineering
    • Photonics
    • Remote sensing

    Background:

    • Underwater light detection and ranging (lidar) performance is hindered by light scattering.
    • Previous research shows hybrid lidar-radar and spatial coherence filtering independently mitigate scattering.
    • These methods modulate light temporally and spatially, respectively, to improve signal quality.

    Purpose of the Study:

    • To investigate the combined performance of spatial and temporal processing techniques for underwater lidar.
    • To determine if combining these methods offers superior scattering reduction compared to individual approaches.
    • To enhance the overall effectiveness of optical ranging in challenging underwater conditions.

    Main Methods:

    • Implementing hybrid lidar-radar for temporal amplitude modulation of light.
    • Applying optical spatial coherence filtering for spatial phase modulation of light.
    • Conducting experimental analysis to evaluate the synergistic effects of combined filtering.

    Main Results:

    • Experimental results confirm that combined spatial and temporal filtering significantly enhances underwater lidar performance.
    • The integrated approach demonstrates superior scattering reduction compared to using either hybrid lidar-radar or spatial coherence filtering alone.
    • Performance improvements exceed the additive benefits of the individual techniques.

    Conclusions:

    • The combination of spatial and temporal processing techniques offers a powerful strategy for overcoming scattering limitations in underwater lidar.
    • This synergistic approach provides a substantial advancement in underwater optical ranging capabilities.
    • Future research can leverage these combined techniques for more robust and effective underwater sensing applications.