Description of AN/APS- 135 and 

 AN/APS-131 SLAR 



Significant system parameters of 

 each SLAR are presented in Table 

 E-2. The major difference be- 

 tween the two systems is the 

 antenna length of each. The APS- 

 135 has a 4.8 m long antenna, 

 while the APS-131's antenna is 

 2.4 m long. This results in the 

 APS-131 having one-half the 

 azimuth resolution of the APS- 

 135. 



Description of Targets 



The USCGC NORTHWIND was 

 the only surface vessel used as a 

 SLAR target during the evaluation. 

 The NORTHWIND is a U.S. Coast 

 Guard wind-class icebreaker, and 

 is 81 m long and 19 m wide. 



IIP classifies icebergs into five size 

 categories: growler, small, 

 medium, large, and very large. 

 Table E-3 lists HP's length and 

 height parameters for each size 

 category. A total of 44 icebergs 

 were used as targets during the 

 evaluation, consisting of 13 small, 

 27 medium, and 4 large icebergs. 

 No growlers or very large icebergs 

 were used. 



Table E-2. SLAR Operating Parameters. 



103 



