Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 24

A pulse radar system has the block diagram shown in Figure 17.56. The specifications of the components are as follows:
transmitter pulse power: 2 kW
operating frequency: 15 GHz
coaxial cable: velocity factor 0.8, loss 0.5 dB/m
waveguide: internal dimensions 8 mm X 16 mm, loss 0.1 dB/m
antenna: gain 15 dBi
target radar cross section: 15 nr
circulator loss 1 dB (each way)
(a) Calculate the time delay and loss (round trip) in the coax.
(b) Calculate the time delay and loss (round trip) in the waveguide.
(c) Calculate the time delay and loss (round trip) in free space.
(d) Calculate the total time delay from transmitter to receiver.
(e) Calculate the signal strength at the receiver, in dBm. Calculate all losses in dB.
Figure 17.56