What is noise temperature in satelite communication?
Answers
Answered by
0
In electronics, noise temperature is one way of expressing the level of available noise power introduced by a component or source. The power spectral density of the noise is expressed in terms of the temperature (in kelvins) that would produce that level of Johnson–Nyquist noise, thus:
{\displaystyle {\frac {P}{B}}=k_{B}T}
where:
{\displaystyle P} is the power (in watts){\displaystyle B} is the total bandwidth (Hz) over which that noise power is measured{\displaystyle k_{B}} is the Boltzmann constant (1.381×10−23J/K, joules per kelvin){\displaystyle T} is the noise temperature (K)
Thus the noise temperature is proportional to the power spectral density of the noise, {\displaystyle P/B}. That is the power that would be absorbed from the component or source by a matched load. Noise temperature is generally a function of frequency, unlike that of an ideal resistor which is simply equal to the actual temperature of the resistor at all frequencies.
{\displaystyle {\frac {P}{B}}=k_{B}T}
where:
{\displaystyle P} is the power (in watts){\displaystyle B} is the total bandwidth (Hz) over which that noise power is measured{\displaystyle k_{B}} is the Boltzmann constant (1.381×10−23J/K, joules per kelvin){\displaystyle T} is the noise temperature (K)
Thus the noise temperature is proportional to the power spectral density of the noise, {\displaystyle P/B}. That is the power that would be absorbed from the component or source by a matched load. Noise temperature is generally a function of frequency, unlike that of an ideal resistor which is simply equal to the actual temperature of the resistor at all frequencies.
Answered by
1
Explanation:
Satellite RF Communications and Onboard Processing
Antenna noise temperature is a measure of all noise that enters a receiver through its antenna. These contribute to the receiver system noise temperature (which is typically about 700–750 K).
Similar questions