Accession Number : AD0712346
Title : PULSE SOUNDING WITH CLOSELY SPACED RECEIVERS AS A TOOL FOR MEASURING ATMOSPHERIC MOTIONS AND FINE STRUCTURE IN THE IONOSPHERE. IV. WAVE-LIKE STRUCTURE IN THE E-REGION DERIVED FROM DRIFT EXPERIMENTS.
Descriptive Note : Environmental research papers,
Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Personal Author(s) : Pfister,W.
Report Date : 11 AUG 1970
Pagination or Media Count : 35
Abstract : A modification of the familiar fading experiment with three or more receivers measures phase fluctuations in addition to the amplitude fluctuations. This information can be used in a generalized correlation and spectral analysis which describes the statistical behavior of the radio wave packet returned from the reflection level. The experimental results can be interpreted as a super-position of a finite number of wave packets, each representing reflection from a rough surface. The different reflection surfaces are located in somewhat different directions and show different doppler shifts. All samples analyzed so far show a remarkable linear behavior in the phase of the cross-spectrum which can only be interpreted as a consequence of the wave-like structure of the reflecting regions. Velocity and direction of propagation can be measured; however, the structure is not well-enough behaved for easy measurement of wavelength and frequency. A comparison between this generalized analysis and the customary full correlation analysis of amplitude data reveals agreement in direction but with higher velocities by a factor of about two. (Author)
Descriptors : (*IONOSPHERE, ATMOSPHERIC SOUNDING), (*ATMOSPHERIC MOTION, ATMOSPHERIC SOUNDING), (*ATMOSPHERIC SOUNDING, CORRELATION TECHNIQUES), PHASE MEASUREMENT, ANTENNA ARRAYS, POWER SPECTRA, INTEGRAL TRANSFORMS, DOPPLER EFFECT, ATTENUATION
Subject Categories : ATMOSPHERIC PHYSICS
Distribution Statement : APPROVED FOR PUBLIC RELEASE