Fluctuation Spectrum and Velocity Structure Function.
CHICAGO UNIV ILL LAB FOR ATMOSPHERIC PROBING
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An equation relating the fluctuation spectrum to the distribution of radial velocity differences of the scatterers, and the pulse volume illumination function is derived. Assuming that the radial velocity differences are due only to turbulence, the particles follow the air motions faithfully, the turbulence is homogeneous, and the reflectivity is constant, then it is shown that the variance of the fluctuation spectrum is a weighted average of the turbulence structure function, the weighting function being completely determined by the pulse volume Illumination function. Various methods of estimating the structure function from measurements of the fluctuation spectrum variance are discussed. Author
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