Sohmitke and Jones 



•AC 



■APPROX 



U' (RAD /SEC) 

 Figure 16 Phase lag 





HIGH PASS FILTERS 



PHASE 



DIFF. 



IET 



TIME 

 LAG 



PHASE 

 DIFF. 

 NET 



o- ?."?■ — 



n* 



■WB 



TIME 

 LAG 



-Wm 



Figure 17 Head sea simulation diagram 



328 



