72 THE DEVELOPMENT OF WEAPONS SYSTEM REQUIREMENTS 



The instantaneous velocity of this target may be expressed as the time 

 derivative of P(/), or 



P{t) = V{t) = hx +7or = "i^Vx +]fsVy = constant (2-2) 



and the position of the target at any time r seconds later can be written 



Pit + r) = m + rFit) = Ux + tF,) = joiy + tF,). (2-3) 



Thus, the computation of the velocity components and the prediction of 

 future target position can be done by relatively simple means once the 

 present position information has been transformed to rectangular co- 

 ordinates.^ 



CIC Command Functions. The position and velocity information 

 computed by the CIC is first used for purposes of assessing the threat on 

 the basis of numbers, position, and velocity. Then, it is employed to com- 

 pute a vectoring guidance course for each interceptor assigned to engage 

 specific target aircraft. The guidance information is transmitted to the 

 interceptor and displayed there by appropriate means. 



Overall battle control is maintained by CIC using a master tactical 

 display in combination with a pre-established operating doctrine. The 

 tactical doctrine — target assignment, force deployment, etc. — applicable 

 to the threat situation is formulated by the CIC officer and is used to 

 monitor and adjust the processing of information in CIC. 



The CIC computer also generates commands which are transmitted to 

 the AEW for the purpose of designating targets for the height-finding 

 radars. 



Vectoring Guidance (Fighter Direction). The type of vectoring 

 guidance employed is dictated by the requirements of the tactical problem 

 and should be uniquely controlled by the weapons system requirements. 

 In the hypothetical example, a high premium was placed on the ability 

 to bring the interceptors into a position to fire their missiles as quickly as 

 possible. In fact, the calculation of the number of interceptors that could 

 engage the threat (40 for 255 n.mi. AEW range) was based on the implied 

 assumption that each interceptor flew in a straight line from fleet center 

 to a point where it could engage its assigned target (see Fig. 2-12). 



The type of fighter direction best fulfilling this requirement is collision 

 vectoring. Its basic principle is shown in Fig. 2-17. For a target at Pi 

 traveling with velocity Ft and an interceptor at P2 traveling with velocity 



•''This advantage does not always lead one to choose rectangular coordinates tor the proc- 

 essing of radar information. For example, in Paragraph 1-4 and Fig. 1-4 the use of polar 

 coordinates is indicated. 



