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    This study introduces a new amplitude modulation method to correct nonlinear errors in Frequency Modulated Continuous Wave (FMCW) ladar systems. The novel approach significantly improves range resolution and measurement precision.

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    Area of Science:

    • Optoelectronics
    • Metrology
    • Laser Technology

    Background:

    • Frequency Modulated Continuous Wave (FMCW) ladar offers high spatial resolution for absolute distance measurement.
    • Non-linearity in laser frequency sweeps degrades FMCW ladar's resolution.
    • Existing resample technologies introduce residual phase errors due to timing mismatches.

    Purpose of the Study:

    • To propose and demonstrate a novel amplitude modulation method for correcting nonlinear errors in FMCW ladar.
    • To eliminate phase errors caused by time delay mismatches.
    • To enhance the range resolution and measurement precision of FMCW ladar systems.

    Main Methods:

    • Developed a novel amplitude modulation technique utilizing two tandem fiber interferometers.
    • The first interferometer generates a carrier signal.
    • The second interferometer modulates the carrier signal's amplitude with range information.

    Main Results:

    • Effectively suppressed nonlinear errors inherent in FMCW ladar.
    • Significantly reduced phase errors stemming from sample time delay mismatches.
    • Achieved a notable improvement in range resolution to 69μm, with stability at 2.9μm and measurement precision at 4.3μm.

    Conclusions:

    • The proposed amplitude modulation method is a viable solution for correcting FMCW ladar nonlinearity.
    • This technique overcomes limitations of traditional resample methods by eliminating phase errors.
    • Demonstrated enhanced performance in range resolution, stability, and measurement precision for FMCW ladar applications.