Frequency-modulated multifunction lidar for anemometry, range finding, and velocimetry-2. Experimental results

Area of Science:

• Optics and Photonics
• Aerospace Engineering
• Signal Processing

Background:

• Frequency-modulated continuous-wave (FMCW) lidar is a versatile technology.
• Accurate range finding and velocimetry are crucial in various applications, including aviation.
• Existing lidar systems face challenges with computational load and parasitic echoes.

Purpose of the Study:

• To evaluate FMCW lidar for range finding, velocimetry, and laser anemometry.
• To develop advanced signal processing and waveform calibration for enhanced range finding.
• To enable air speed measurement beyond helicopter rotor turbulence for safety applications.

Main Methods:

• Implementation of an original signal processing and waveform calibration technique for FMCW lidar.
• Demonstration of multiple target distance measurement capabilities.
• Application of FMCW lidar for laser anemometry, focusing on avoiding parasitic echoes near helicopters.

Main Results:

• Achieved a reduction in computational effort for range finding while maintaining long-range measurement capability.
• Successfully demonstrated multiple target distance measurement.
• Validated the functionality for laser anemometry, measuring air speed beyond the rotor-induced turbulent volume.

Conclusions:

• FMCW lidar, with optimized processing, provides efficient and capable range finding.
• The developed laser anemometry approach effectively measures air speed in challenging helicopter environments.
• The technology shows promise for vortex ring state warning systems, enhancing flight safety.