Effect of Sky Noise on Antenna Temperature
The often used but rarely justified formula by Blake that the antenna temperature TA contribution from sky temperature TS is TA = 0.876TS+36°K. This equation is particularly mysterious when one considers the origin of the coefficients 0.876 and 36°K. In this chapter, the basic principles behind this expression are discussed, and it is shown to be valid for a 1950s type of antenna with high back or sidelobes. A general expression that applies to modern ESAs is developed.
KeywordsElectronically scanned array (ESA) Sky noise temperature Antenna noise temperature
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