Abstract
Slant-path propagation measurements using transmissions to and from theOtssatellite are being carried out at an elevation angle of 29.9°. The measurements allow the determination of the attenuation at 14.5 and 11.8 GHz for circular polarization and 11.575 GHz for linear polarization. The satellite beacons are also being used for the calibration of 12.1 and 14.8 GHz radiometers. 20 and 30 GHz radiometers are also operated on the site. Rain fades in excess or 15 dB and 10 dB at 14.5 GHz and 11.8 GHz respectively have so far been observed but the effect of wet snow on the earth station aerial surface is much more severe than this. Measurements of rain attenuation ratio between 14.5 GHz and 11.8 GHz indicate a value of 1.5 ± 0.1 and spectrum analysis of scintillations on the received satellite beacons indicate spectral components of up to about 5 Hz.
Analyse
Des mesures de propagation oblique durant des transmissions vers le satelliteOtset en provenance de celui-ci ont été effectuées, l’angle d’élévation étant de 29,9°. Les mesures permettent de déterminer l’affaiblissement à 14,5 GHz et à 11,8 GHz pour la polarisation circulaire et à 11,575 GHz pour la polarisation rectiligne. Les radiobalises du satellite servent également pour l’étalonnage des radiomètres à 12,1 GHz et à 14,8 GHz. Des radiomètres à 20 GHz et à 30 GHz fonctionnent sur le site. On a pu observer jusqu’ici des excès d’affaiblissement qui dépassent les 15 dB et les 10 dB à 14,5 GHz et à 11,8 GHz respectivement, mais l’effet de la neige mouillée sur la surface de l’antenne de la station terrienne est encore beaucoup plus important. Des mesures du taux d’affaiblissement dû aux précipitations entre 14,5 GHz et 11,8 GHz indiquent une valeur de 1,5 ± 0,1 et l’analyse spectrale des scintillations des signaux reçus des radiobalises du satellite indique des composantes allant jusqu’à environ 5 Hz.
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Well, J.T., Howell, R.G. OTS and radiometric slant-path measurements at Martlesham Heath (UK). Ann. Télécommun. 36, 15–23 (1981). https://doi.org/10.1007/BF02996999
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DOI: https://doi.org/10.1007/BF02996999
Key words
- Wave propagation
- Centimeter wave
- Wave attenuation
- Satellite communication
- Radiometer
- Calibration
- Experimental study
- Hydrometeor