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Chirp-pulse-compression three-dimensional lidar imager with fiber optics
Guy N Pearson1, Kevin D Ridley, David V Willetts
1QinetiQ, St. Andrews Road, Malvern WR14 3PS, United Kingdom. gnpearson@qinetiq.com
Applied Optics
|February 1, 2005
Summary
This study introduces a novel 3D lidar imager for detailed target imaging. The system achieves high-resolution 3D mapping up to 2 km using chirp-pulse compression.
Area of Science:
- Optical Engineering
- Remote Sensing
- Laser Technology
Background:
- Developing advanced imaging systems for high-resolution 3D mapping is crucial for various applications.
- Existing lidar technologies face limitations in range, resolution, and target discrimination.
Purpose of the Study:
- To describe a novel coherent 3D lidar imager.
- To demonstrate its capability for high-resolution 3D imaging of hard targets.
Main Methods:
- Utilized a master-oscillator-power-amplifier concept with a 1.5 micrometer wavelength.
- Employed chirp-pulse compression via a fiber-optic delay line and two-stage fiber amplifier.
- Cross-correlated digitized return signals with the outgoing pulse for compression.
Main Results:
- Achieved pulse compression from 350 ns to approximately 8 ns.
- Generated 3D images of hard targets up to 2 km range.
- Demonstrated near-diffraction-limited angular resolution and submeter range resolution.
Conclusions:
- The developed 3D lidar imager offers significant improvements in resolution and range.
- The system is effective for detailed 3D mapping of targets at extended distances.