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Access Type
Open Access
Document Type
thesis
Degree Program
Electrical & Computer Engineering
Degree Type
Master of Science (M.S.)
Year Degree Awarded
2011
Month Degree Awarded
September
Keywords
Atmospheric Turbulence, Optical Wave Propagation, Wind Estimation, Angle-of-Arrival, Time-Delay-to-Peak, Slope-at-Zero-Lag
Abstract
For optical propagation through the turbulent atmosphere, the angle of arrival (AOA) cross-correlation function obtained from two spatially separated light sources carries information regarding the transverse wind velocity averaged along the propagation path. Two methods for the retrieval of the beam transverse horizontal wind velocity, v_t, based on the estimation of the time delay to the peak and the slope at zero lag of the AOA cross-correlation function, are presented. Data collected over a two week long experimental campaign conducted at the Boulder Atmospheric Observatory (BAO) site near Erie, CO was analyzed. The RMS difference between 10 s estimates of v_t retrieved optically, and 10 s averages of the transverse horizontal wind velocity measured by an ultrasonic anemometer, was found to be 14 cm/s for the time-delay-to- peak method and 20 cm/s for the slope-at-zero-lag method, for a 2 h period beginning 0345 MDT on 16 June, 2010, during which the transverse horizontal wind velocity varied between -1 m/s and 2 m/s.
DOI
https://doi.org/10.7275/2108420
First Advisor
Andreas Muschinski
Included in
Atmospheric Sciences Commons, Electromagnetics and Photonics Commons, Meteorology Commons, Signal Processing Commons