Abstract
A system for continuous-wave coherent Doppler lidar (CW lidar), made
up of all-fiber structures and a coaxial transmission telescope, was set
up for wind measurement in Hefei (31.84 N, 117.27 E), Anhui province of
China. The lidar uses a fiber laser as a light source at a wavelength of
1.55 μm, and focuses the laser beam on a location 80 m away from the
telescope. Using the CW lidar, radial wind measurement was carried out.
Subsequently, the spectra of the atmospheric backscattered signal were
analyzed. We tested the noise and obtained the lower limit of wind
velocity as 0.721 m/s, through the Rayleigh criterion. According to the
number of Doppler peaks in the radial wind spectrum, a classification
retrieval algorithm (CRA) combining a Gaussian fitting algorithm and a
spectral centroid algorithm is designed to estimate wind velocity.
Compared to calibrated pulsed coherent wind lidar, the correlation
coefficient for the wind velocity is 0.979, with a standard deviation of
0.103 m/s. The results show that CW lidar offers satisfactory performance
and the potential for application in wind measurement.
© 2019 Optical Society of Korea
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