Figure 2-34.Lin-Log amplifier stage response curves.
The most common of the automatic tracking radars is the MONOPULSE RADAR. The monopulse
radar obtains the three target position coordinates of range, bearing, and elevation from a single pulse.
The receiver for a monopulse radar must have three separate channels to process range, bearing, and
elevation information. The block diagram of a simplified monopulse receiver is shown in figure 2-35.
Figure 2-35.Monopulse receiver block diagram.
As in a conventional receiver, each channel of the monopulse receiver converts the return echo to an
IF frequency by mixing the returned signal with a common local oscillator signal. The sum of the energy
from all four return signals is mixed with the local oscillator signal to produce range IF information.
Bearing information is obtained by subtracting the energy from horns B and D from the energy from
horns A and C: