Receiver (noise) temperature: Difference between revisions
From Glossary of Meteorology
imported>Perlwikibot No edit summary |
imported>Perlwikibot No edit summary |
||
| Line 9: | Line 9: | ||
</div> | </div> | ||
<div class="definition"><div class="short_definition">A measure of the [[noise power]] density at the [[output]] of a radio or [[radar]] receiver due to internally generated [[noise]] and passive losses in the [[receiver]]. In particular, the receiver temperature ''T''<sub>''r''</sub> is the [[temperature]] of a resistor having noise power per unit [[bandwidth]] equal to that of the receiver output at a given [[frequency]].</div><br/> <div class="paragraph">It is given in terms of the power output ''P'' and bandwidth ''B'' of the receiver by ''T''<sub>''r''</sub> = ''P''/''kB'', where ''k'' denotes [[Boltzmann's constant]], 1.38 × 10<sup>-23</sup>J K<sup>-1</sup>. The receiver temperature is related to the receiver noise factor ''F'' by ''T''<sub>''r''</sub> = ''T''<sub>''o''</sub>(''F'' - 1) with ''T''<sub>''o''</sub> = 290 K. <br/>''See'' [[noise temperature]], [[noise figure]].</div><br/> </div> | <div class="definition"><div class="short_definition">A measure of the [[noise power]] density at the [[output]] of a radio or [[radar]] receiver due to internally generated [[noise]] and passive losses in the [[receiver]]. In particular, the receiver temperature ''T''<sub>''r''</sub> is the [[temperature]] of a resistor having noise power per unit [[bandwidth]] equal to that of the receiver output at a given [[frequency]].</div><br/> <div class="paragraph">It is given in terms of the power output ''P'' and bandwidth ''B'' of the receiver by ''T''<sub>''r''</sub> = ''P''/''kB'', where ''k'' denotes [[Boltzmann's constant]], 1.38 × 10<sup>-23</sup>J K<sup>-1</sup>. The receiver temperature is related to the receiver noise factor ''F'' by ''T''<sub>''r''</sub> = ''T''<sub>''o''</sub>(''F'' - 1) with ''T''<sub>''o''</sub> = 290 K. <br/>''See'' [[noise temperature]], [[noise figure|noise figure]].</div><br/> </div> | ||
</div> | </div> | ||
Latest revision as of 16:45, 25 April 2012
receiver (noise) temperature
A measure of the noise power density at the output of a radio or radar receiver due to internally generated noise and passive losses in the receiver. In particular, the receiver temperature Tr is the temperature of a resistor having noise power per unit bandwidth equal to that of the receiver output at a given frequency.
It is given in terms of the power output P and bandwidth B of the receiver by Tr = P/kB, where k denotes Boltzmann's constant, 1.38 × 10-23J K-1. The receiver temperature is related to the receiver noise factor F by Tr = To(F - 1) with To = 290 K.
See noise temperature, noise figure.
See noise temperature, noise figure.
