Table E-6. Total Detection Opportunities 

 (Type 1 and Type 2 Searches, 27 and 54 nm Scales) 



Surface Truth Data 



Every 15 minutes, IIP personnel 

 on USCGC NORTHWIND re- 

 corded NORTHWIND's position 

 and, bearing and range to every 

 visible ice target in the SLAR 

 Target Position Record. Position 

 data were obtained from a GPS/ 

 LORAN C receiver. The bearing 

 and range data were obtained 

 from NORTHWIND's surface 

 search radar. Every 30 minutes, 

 IIP personnel recorded surface 

 environmental conditions, includ- 

 ing wind speed/direction, cloud 

 cover, visibility, sea state, humid- 

 ity, and air and water temperature. 



Post-Analysis 



Following the experiment, IIP 

 personnel used the SLAR film, 

 SLAR Search Run Summary 

 Sheets, SLAR Target Logs, and 

 SLAR Target Position Records to 

 reconstruct and describe each 

 target detection opportunity. The 

 IIP analysts correlated the SLAR 

 Target Position Records with the 

 SLAR film to determine which of 

 the documented targets were 

 discernible on the film. 



Results and Discussion 



Table E-6 summarizes the total 

 number of detection opportunities 

 for each SLAR. Table E-7 shows 

 the distribution of the detection 

 opportunities with altitude and 

 lateral range for each SLAR. For 

 the APS-135, the detection 

 opportunities were distributed 

 evenly between the four altitudes 

 4,000, 6,000, 8,000, and 10,000 

 feet and in the mid to far-range (5 

 to27nm). For the APS-131. most 

 of the detection opportunities were 

 at 4,000 and 8,000 feet and in the 

 far range (15-27 nm). 



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