116 THE DEVELOPMENT OF WEAPONS SYSTEM REQUIREMENTS 



Stabilization Requirements. The angular requirements for the 

 search pattern were derived with the tacit assumption that the search 

 pattern was space-stabilized in roll and pitch about the aircraft flight line. 

 That is to say, the volume of space illuminated by the radar is independent 

 of aircraft angles of attack and roll. This assumption results in a con- 

 siderably smaller search pattern than would be the case if these motions 

 were allowed to displace the search pattern. This effect is illustrated by 

 Fig. 2-38. Search pattern stabilization also makes the radar search display 



140 



Q 



oi 100 



60 



40 



20 



20 



40 



60 80 100 120 



ANGLE OFF TARGET'S NOSE (deg) 



140 



160 



180 



Fig. 2-38 Elevation Search Angle Requirements for 10 n.mi. Lock-on (Stabilized 

 and Unstabilized Search). 



problem easier to solve, as will be shown in Chapter 8. For these reasons 

 it is required that AI radar search pattern be stabilized in roll and pitch 

 about the aircraft flight line. 



Summary. A summary of the AI radar requirements dictated by 

 vectoring considerations is shown in the overall requirements summary, 

 Paragraph 2-30. 



2-27 ANALYSIS OF THE CONVERSION PROBLEM 



The plan for analyzing the conversion problem is shown in Fig. 2-39. 

 Analysis of the conversion phase must yield the following information 

 relevant to the AI radar design: 



