Microwave antenna temperature of the earth from geostationary orbit
作者： Eni G Njoku , Ernest K Smith , None
关键词: Remote sensing 、 Antenna aperture 、 Radiative transfer 、 Computational physics 、 Geosynchronous orbit 、 Noise (radio) 、 Antenna (radio) 、 Geostationary orbit 、 Parabolic antenna 、 Atmosphere of Earth 、 Physics
摘要: The microwave antenna temperature of the earth has been computed for case a communication satellite viewing from geostationary orbit. An earth-coverage beam is assumed and detailed computations are performed to account varying land-ocean fractions within field view. Emission characteristics earth's atmosphere surface used with an accurate radiative transfer program compute observed brightness temperatures. Values 250 290 K commonly in noise calculations found be over-conservative estimates, more realistic values lying 60-240 range depending on frequency subsatellite longitude. These also depend assumptions concerning coverage. Variations atmospheric conditions, variations shape (as distinct coverage), affect results by less than about 10 K.
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