
Accession Number : AD0755440
Title : Effect of Finite Radar Pulse Volume on Turbulence Measurements.
Descriptive Note : Technical rept. Aug 71Jul 72,
Corporate Author : CHICAGO UNIV ILL LAB FOR ATMOSPHERIC PROBING
Personal Author(s) : Srivastava,Ramesh C. ; Atlas,David
Report Date : 15 JUL 1972
Pagination or Media Count : 36
Abstract : Equations relating the mean of the Doppler spectrum and the distribution of point velocities, and their spectra are derived under the assumptions that: (1) the scatterers follow the air motion faithfully, (2) the reflectivity is constant, and (3) the beam illumination function is separable. Relationships between the 1D longitudinal and transverse spectra of the mean velocity and the 3D spectrum of the point velocities are derived. Numerical computations with a model KolmogorovObukhov turbulence spectrum are performed to illustrate the effects of filtering. The ratio of the total energy under measured spectrum to that under spectrum of point velocities is computed as a function of beam dimensions. An equivalent rectangular filter approximation is proposed for computing the 1D spectra. Analytical results are obtained for longitudinal spectrum and are shown to be in excellent agreement with numerical results for actual filter.
Descriptors : (*ATMOSPHERIC SOUNDING, METEOROLOGICAL RADAR), (*ATMOSPHERIC MOTION, RADAR REFLECTIONS), DOPPLER EFFECT, POWER SPECTRA, SPECTRUM ANALYZERS, DOPPLER RADAR
Subject Categories : Atmospheric Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE