2.31. A radar has the following receiver components. They are arranged in the order shown below

(a) What is the receiver noise figure through the RF amp and referenced to the input of the waveguide (the first component after the antenna)?

(b) What is the noise figure of the receiver through the IF amp and referenced to the input of the RF amp?

(c) What is the effective noise temperature of the receiver through the IF amp and referenced to the input of the waveguide?

(d) Suppose you want to determine how internal noise and sky noise contribute to noise power at various points in the receiver. Specifically, how does the noise power at the output of each component as a function of the effective noise temperature of the antenna, Tant and noise bandwidth, B. Derive four equations that will allow us to easily perform the computations. All of your equations should be of the form P = B(KTant+K) where K and K2 are constants. Provide a table with the four sets of values for K and K.

Transcribed Image Text:

Receiver Stages Stage # Component Gain, dB Noise Figure, dB 1 Waveguide -2 2 2 RF Amp 28 5 3 1st Mixer -3 15 4 IF Amp 100 30