2-7] 



THE SYSTEM STUDY PLAN 59 



Zone of CIC 

 -Vectoring Inaccuracy 



Zone of 

 AFCS Inaccuracy 



rrv 



'=^X 



Search 



Zone of Missile 

 Guidance Inaccuracy 



Fig. 2-9 A Tactical Situation. 



very low probability of success for any phase of the intercept mission can 

 render pointless any efforts to achieve very high probabilities in other 

 phases and thus would serve as a guide to more effective development 

 emphasis. 



2-7 THE SYSTEM STUDY PLAN 



The known (fixed) and unknown (variable) elements of the problem have 

 now been defined. Referring to Fig. 2-2, it is seen that the next step is to 

 analyze the interrelationships between the fixed and variable elements to 

 determine the contribution of each variable element to mission accomplish- 

 ment. From such analyses, a quantitative understanding of system 

 operation will be obtained and — eventually — radar requirements will 

 evolve. 



The unknown or variable elements may be broken into two basic cate- 

 gories: (1) weapons system variables, and (2) subsystem variables. 



The primary weapons system variables are: 



1. The early warning detection range measured from fleet center. 



2. The number of interceptors which may engage the specified target 

 complex 



3. The effectiveness (kill probability) of each interceptor which 

 engages the target complex 



