2-10] DESIGN OF AIRBORNE EARLY WARNING SYSTEM 67 



ments are made. The advantages of the optimum assignment tactic are 

 apparent. 



In this paragraph we have shown how the effectiveness of an interceptor 

 system may be analyzed for an assumed mode of operation and assumed 

 values for system parameters. We have also illustrated the concept of 

 obtaining the "trade-off" between various system parameters and the 

 effects of changes in system logic. The examples chosen are merely illustra- 

 tive of the information that must be generated for an actual problem to 

 enable the radar system designer to understand his part of the overall 

 problem. 



Using the assumed or derived values for the overall system parameters, 

 and the defined system logic, we shall now derive the requirements for the 

 AEW and AI radar systems. The first phase of these analyses (Steps 2 and 

 3 of Master Plan of Fig. 2-2) is to establish the allocation of responsibility 

 between these two systems. 



2-10 PRELIMINARY DESIGN OF THE AIRBORNE EARLY 

 WARNING SYSTEM 



The AEW system must contribute to the solution of the air defense 

 problem in several ways as may be seen from the operational sequence 

 given in Paragraph 2-3. 



1 . The targets must be detected at sufficient range from task force center 

 to permit fulfillment of the required system kill probability. 



2. The targets must be identified and evaluated. This means that their 

 identity, number, position, heading, speed, and altitude must be obtained; 

 this information must be evaluated in terms of the implied threat to the 

 task force; and weapons must be assigned, if necessary. This process must 

 be completed within a delay time that is compatible with early warning 

 detection range and the characteristics of the interceptor defense system. 



3. The AEW system must provide information which can be used to 

 vector the interceptors toward their assigned targets so that the inter- 

 ceptors may detect and acquire the targets with their own AI radars. The 

 type of vectoring guidance employed must be compatible with system re- 

 sponse times permitted by the early warning detection range. The accuracy 

 of vectoring guidance must be compatible with the input accuracy require- 

 ments of the interceptor aircraft, AI radar, and fire-control system. 



4. The AEW system must provide information that may be used for 

 overall battle control and surveillance. 



The basic plan to be used for the AEW system analysis is shown in 

 Fig. 2-14. Also shown are the interrelations between: (1) the AEW system 

 and the overall problem, and (2) the AEW system and interceptor system. 



