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Modulation techniques for an airborne laser scanner.
Applied Optics
|March 10, 2010
Summary
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.
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.
