Title :
Active atmospheric fade compensation for spacecraft antennas
Author :
Kalatizadeh, Y. ; Philippou, G.Y. ; Brain, D.J. ; Crone, G. ; Poiares Baptista, J.P.V. ; Paraboni, A.
Author_Institution :
ERA Technol., Leatherhead, UK
Abstract :
Various atmospheric conditions cause attenuation in the signal received from broadcast satellites. The total attenuation consists of losses due to cloud, atmospheric scintillation, oxygen absorption, water vapour and rain. The rain attenuation is usually the most important one of these and at 22 GHz can produce fade margins of up to 20 dB with considerable and comparatively rapid geographical and temporal variation. It is, therefore, important to try to compensate for fading due to atmospheric effects to achieve a better power flux density over the satellite coverage area. The practical implementation of such compensation for the Italian high definition TV transmission is described
Keywords :
electromagnetic wave absorption; 22 GHz; HDTV; Italy; SHF; active atmospheric fade compensation; atmospheric conditions; atmospheric effects; atmospheric scintillation; broadcast satellites; cloud; fade margins; geographical variation; high definition TV transmission; losses; oxygen absorption; power flux density; rain attenuation; satellite coverage area; signal attenuation; spacecraft antennas; temporal variation; water vapour;
Conference_Titel :
Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407)
Conference_Location :
Eindhoven
Print_ISBN :
0-85296-637-7
DOI :
10.1049/cp:19950457
