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.
Environmental research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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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
- Atmospheric Physics