incidence. Areal mapping rates for the baseline system are tabulated in 

 Table 12. 



Table 12 

 AREAL SURVEILLANCE RATE FOR BASELINE SYSTEM 



(5) Location Accuracy 



The microwave radiometer beamwidth of 0.6° permits 

 the vessel to be located with respect to the platform with an accuracy 

 of better than 100 ft--typically much more accurately than the position 

 of the platform is known. Thus, vessel location accuracy will be de- 

 termined by the accuracy with which the airborne platform can be located. 

 For example, LORAN-C, the navigational system selected as standard for 

 the Coastal Confluence Zone, gives position location to accuracies of 

 one-quarter nautical mile under favorable conditions. 



c. Cost Analysis 



It is estimated that a 35-GHz radiometer using a phased 

 array installed in the belly or bottom of the wing of a suitable aircraft 

 could be built and installed for $200,000. It is estimated that if a 

 quantity of ten or more units or installations were made, this cost 

 could be reduced to approximately $100,000. 



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