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the contribute due to the sun and the earth only are:
quite sun: typically 6000K 8depend on freq)
earth: worst case typ. 300K
But i don't know if other aspects shoud be taken in consideration (ionosphere?, other ?)
The sun contribute shoud be calculate by a convolution of the solid angles of antenna beam and the sun beam. Pratically with large antenna beam the sun give a more little effect than 6000K
the contribute due to the sun and the earth only are:
quite sun: typically 6000K 8depend on freq)
earth: worst case typ. 300K
But i don't know if other aspects shoud be taken in consideration (ionosphere?, other ?)
The sun contribute shoud be calculate by a convolution of the solid angles of antenna beam and the sun beam. Pratically with large antenna beam the sun give a more little effect than 6000K
Noise temperature is a measure of system performance.
It depends on many factors... this temperature can be increased if the sun enters in the radiation lobes of the antenna, this produces an increase on the system temp.
A side effect of this is that a weak signal could became not detectable.
Such problem happens for GEO satellite that experience what is called "sun outages".
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