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9.Calculation of receiver G/T
1.Antenna elevation angle (deg)
2.Antenna noise temp Antenna noise temperature is the sum of all noise sources
at the antenna.
3.Increase in Antenna noise due to rain
Rain effects the antenna noise temperature. It increases
the antenna noise temperature.
5.LNA noise temp LNA means Low Noise Amplifier. LNA noise temperature
means noise temperature of LNA.
6.System noise temp (k) It is the sum of all noise temperatures at the receiving antenna
System noise temperature (k) = antenna noise temperature +
increase in antenna noise due to rain + LNA
noise temperature ……………………………(k)…………….[13]
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Example: Calculate system noise temperature of a
satellite having noise temperature 25 K increase in antenna noise due to
rain =0 K LNA noise temperature = 50 K |
Receiver G/T (dB/K) = Receiver Antenna gain – 10
log(system noise temperature)
… (dB/k)…………………….[14]
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Example: Calculate Receiver G/T (dB/K) of a satellite
having antenna gain 41.33 , over all receiver noise temperature = 75 K |
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