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High-resolution CW lidar altimetry using repeating intensity-modulated waveforms and Fourier transform reordering.

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    A new interpolation method enhances range measurements for intensity-modulated continuous wave (IM-CW) lidar. This technique offers high-precision altimetry and real-time applications with minimal computational overhead.

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    Area of Science:

    • Geospatial Science
    • Optical Engineering
    • Signal Processing

    Background:

    • Accurate range measurements are crucial for applications like altimetry.
    • Intensity-modulated continuous wave (IM-CW) lidar systems require efficient signal processing for high-precision data acquisition.
    • Existing methods for processing IM-CW lidar waveforms can be computationally intensive, limiting real-time applications.

    Purpose of the Study:

    • To introduce a novel interpolation method for processing repeating IM-CW lidar waveforms.
    • To enable high-precision range measurements and altimetry.
    • To facilitate real-time implementation of lidar data processing.

    Main Methods:

    • The method involves cross-correlation between transmitted and received IM-CW lidar signals.
    • It utilizes reordering of array elements in the frequency domain to convert repeating synthetic pulses into a single, highly interpolated pulse.
    • Computational complexity is minimally increased beyond the core correlation process.

    Main Results:

    • The developed interpolation method achieves high-precision range measurements.
    • Flight-testing validated the method's viability for high-speed interpolated range measurements.
    • A standard deviation of 0.75 m was achieved over water with 350 mW transmitted power at a range of 2600 m.

    Conclusions:

    • The described interpolation method is effective for high-precision range measurements using IM-CW lidar.
    • The technique's computational efficiency allows for real-time applications.
    • This advancement supports improved altimetry and other lidar-based remote sensing applications.