302 



GENERIC TYPES OF RADAR SYSTEMS AND TECHNIQUES 



Fig. 6-3 Overlapping 

 Individual Antenna Pat- 

 terns of a Monopulse 

 Radar. 



Fig. 6-4 Sum 

 of Overlapping 

 Patterns in a 

 Monopulse Ra- 

 dar. 



Fig. 6-5 Difference of 



Overlapping Antenna 



Patterns in a Monopulse 



Radar. 



The process of generating sum and difference signals results from in-phase 

 connection of the two lobes for the sum pattern, and antiphase connection 

 for the difference pattern. Consequently the sum and difference signals are 

 mutually in phase for directions of arrival on one side of the difference 

 pattern null, and in antiphase for directions of arrival on the other side of 

 the null. Thus the difference signal contains within itself only angle error 

 signal magnitude, while the sum signal contains the phase reference by 

 which angle error sense is determined. The output of the product detector 

 as a function of the direction of arrival of signal energy relative to the 



Fig. 6-6 Monopulse Error Signal Curve. 



