Abstract
The 30 GHz signal which is received from the millimeter wave experiment on board the geostationary satellite ATS-6suffers from scintillation effects which are usually caused by refractive index fluctuations in the troposphere. The measurements show day and night differences with minima in the early morning and also differences depending on clear sky or cloudy sky. During rain the scintillations usually become smaller. Not only the copolar signal but also the crosspolar signal shows scintillation. In general, these fluctuations are larger than those of the copolar signal. A measuring set up will be shown for measuring the autocorrelation function of the scintillation signal. Knowing the autocorrelation function, the energy spectral density is known as both are a Fourier transform pair. The autocorrelation function is made visible on an oscilloscope and appears to be a function of time. By making a film the continuous changing picture of the auto correlation function is made visible.
Analyse
Le signal à 30 GHz reçu du satellite stationnaire expérimental ATS-6présente des scintillations qui sont produites en général par des fluctuations de l’indice de réfraction dans la troposphère. Les mesures montrent une différence entre le jour et la nuit avec un minimum au petit matin ainsi que des différences qui dépendent de la nébulosité. Pendant les pluies, les scintillations deviennent généralement plus faibles. La scintillation affecte aussi bien le signal en polarisation parallèle que celui en polarisation croisée qui présente souvent les fluctuations les plus importantes. L’auteur décrit un dispositif de mesure de la fonction d’autocorrélation du signal de scintillation. Connaissant la fonction d’autocorrélation, on en déduit la densité spectrale d’énergie, ces deux dernières formant une paire de transformées de Fourier. La fonction d’autocorrélation est observée sur un oscilloscope, ce qui permet de constater qu’elle varie en fonction du temps. A l’aide d’un film, on peut observer le changement continu de la fonction d’autocorrélation.
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Dijk, J., Maanders, E.J. & de Winter, P.J. Scintillation effects receiving ATS-6 at 30 GHz. Ann. Télécommunic. 32, 508–513 (1977). https://doi.org/10.1007/BF03003504
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DOI: https://doi.org/10.1007/BF03003504