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Joshua Rapp, Robin M A Dawson, Vivek K Goyal

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    |November 13, 2020
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    Summary
    This summary is machine-generated.

    This study introduces subtractively-dithered single-photon lidar (SPL) to improve depth estimation precision. This method enhances accuracy despite limitations in detector timing resolution, achieving significantly lower error rates.

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    Area of Science:

    • Photonics and Optical Sensing
    • Advanced Measurement Techniques

    Background:

    • Single-photon lidar (SPL) offers high sensitivity for long-range depth measurement.
    • Current single-photon avalanche diode (SPAD) detector timing resolution limits depth estimation precision.

    Purpose of the Study:

    • To develop a method for high-resolution depth estimation using SPL despite coarse detector timing.
    • To improve the accuracy of depth measurements in challenging conditions.

    Main Methods:

    • Implementation of subtractively-dithered SPL by introducing programmable delays.
    • Utilizing relative time shifts shorter than the detector's time bin duration.
    • Modeling the temporal instrument response function for improved estimation.

    Main Results:

    • Achieved high-resolution depth estimates with coarse detector resolution.
    • Developed an estimator outperforming the sample mean.
    • Reduced root mean-squared error in depth estimates by up to 13 times compared to non-dithered methods.

    Conclusions:

    • Subtractively-dithered SPL enables precise depth sensing with existing SPAD detector limitations.
    • The technique offers a simple and effective approach for enhancing depth estimation accuracy.
    • Potential for globally dithered SPAD arrays in high spatial- and temporal-resolution depth sensing applications.