2-25] ANALYSIS OF THE VECTORING PHASE 



'Space Reference 



109 



for 



Error 

 Signal 



Fig. 2-31 Vectoring Error Geometry. 

 A^i = ARa/R 



ARa « R 



(2-41) 



where ARa = component of the relative position error between target and 

 interceptor which is normal to the sight line. 



The vectoring system computes a desired interceptor lead angle Lc with 

 respect to the erroneous sight-line angle. From Fig. 2-31 the computed lead 

 angle is 



dd 



dLn 

 dd 



dLp 



dVr 



sin Ld = Vt/^f sin 6 

 Then, 



[ l^F cos Ld\ L ^^'' <^°s Ld 



AxPt + 



Fp cos Ld 



(2-42) 



(2-4) 



AFt. 

 (2-43) 



