Amplitude Scintillation Observations and Systems Application,
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)
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For the design of a transionospheric communications link, scintillation data should be available to describe the statistics of adequate signal level, that is, the time durations that the signal power remains above specified levels, and the statistics of fades, that is, the time durations that the signal power remains below specified levels. The adequate signal level statistics assist designers in choosing data frame formats, message length, and estimating reliability of message reception. The fade statistics are useful in choosing coding andor time diversity techniques to overcome this fading. Signal statistics of this type are illustrated using data recorded at equatorial, sub-auroral, and auroral latitudes. These signal statistics must be folded into a morphological pattern which contains statistics of scintillation fading as a function of geomagnetic latitude, instantaneous magnetic excursion, and local time. Recent data taken at auroral and sub-auroral latitudes have shown the effects on F layer irregularities of magnetic storms. In particular, the magnetic storms of August 1972 illustrate worst case scintillation levels. Data during the storm of October 31 - November 1, 1972 is used to show the correlation of scintillation with local magnetic variations.
- Atmospheric Physics
- Radio Communications