Studies on the temperature of the medium at 11.7 GHz
Abstract
The temperature of the medium of propagation and its affect on the attenuation of satellite radio transmissions at 11.7 GHz is investigated using data on 44 attenuation events obtained with the Orbital Test Satellite (OTS) launched in 1976 and the radiometric array at Lustbuehel Observatory in Austria. The theoretical relationship of medium temperature, sky-noise temperature, and signal attenuation is presented, and the sky-noise-radiometer and satellite-signal-receiver apparatus are described. Analysis of the OTS and sky-noise results indicate that the 270-K standard medium temperature now commonly used to calculate signal attenuation from sky-noise temperature is inaccurate, underestimating attenuation in many cases, and should be corrected to about 235 K. The applicability of this finding to stations with different tropospheric conditions is under investigation.
- Publication:
-
Archiv Elektronik und Uebertragungstechnik
- Pub Date:
- June 1983
- Bibcode:
- 1983ArElU..37..199R
- Keywords:
-
- Atmospheric Attenuation;
- Radio Transmission;
- Satellite Transmission;
- Temperature Effects;
- Noise Temperature;
- Ots (Esa);
- Radiometers;
- Troposphere;
- Communications and Radar