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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Modulation techniques for an airborne laser scanner.

S R Robinson, R C Chapuran

    Applied Optics
    |March 10, 2010
    PubMed
    Summary
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    This study analyzes laser modulation techniques for airborne scanners measuring range and reflectance. Sinusoidal modulation is simple, while pseudonoise (PN) coding offers future potential for enhanced performance.

    Area of Science:

    • Optics and Photonics
    • Remote Sensing Technology
    • Signal Processing

    Background:

    • Airborne laser scanners are crucial for measuring slant range and reflectance.
    • Performance metrics include range ambiguity, resolution, and estimate variance.
    • Variance is key for comparing reflectance measurements.

    Purpose of the Study:

    • To analyze laser output power modulation methods for airborne scanners.
    • To evaluate performance factors like range ambiguity, resolution, and variance.
    • To compare the efficacy of different modulation techniques.

    Main Methods:

    • Analysis of sinusoidal modulation.
    • Analysis of FM chirp of a subcarrier modulation.
    • Analysis of pseudonoise (PN) coded pulse train modulation.

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    Main Results:

    • Sinusoidal modulation is a simple option when range ambiguity is acceptable.
    • PN-coded pulse train modulation shows significant promise with increased bandwidth.
    • All three analyzed techniques demonstrate potential for laser output power modulation.

    Conclusions:

    • The choice of modulation technique depends on specific application requirements, particularly tolerance for range ambiguity.
    • Advancements in detector and laser modulation bandwidth favor PN-coded techniques for future applications.
    • Optimizing laser modulation is essential for improving airborne scanning performance.