Temporal-Frequency Spectra for Waves Propagating over Straight and Folded Paths: a Comparison.
Expressions are determined for the relationship between the crosswind speed and the temporal-frequency spectra of the log-amplitude fluctuations of plane and spherical waves propagating over folded paths in a turbulent atmosphere. The results of the spherical wave indicate that in addition to information about turbulent motion, the spectral content contains a path position modulation that depends on the detector displacement from the center of the wave. This displacement may lead to errors in the determination of turbulent motion from optical measurements.
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