Surveillance cost per unit area of ocean patrolled 

 depends on the type of aircraft used. We have adopted an operating cost 

 of $1097/hr for an aircraft capable of carrying a 1-m antenna and 

 of performing ocean patrols. This cost figure for the aircraft assumes 

 that a MRS aircraft will be used; the hourly cost is extracted from 

 page 38 of Reference 7, The total hourly cost comprises an operating 

 cost of $977 per hour and an investment cost of $120 per hour. 



Operating cost of the radiometers, data processing, and 



data interpretation is estimated at $100/hr for a total cost of $1.2 x 

 10 /hr. All 

 cost, C, of 



3 

 10 /hr. All costs are in FY 1975 dollars. This gives an operatm 



3 -1 

 $1,2 X 10 hr 

 C = ^ 



2 2-1 

 5. 8 X 10 nmi hr 



-2 

 C = $2,07 nmi 



d. Conclusions 



The following conclusions have emerged from this study 

 of the microwave radiometric detection of ships off the coast: 



1, Detection of ships by microwave radiometric 

 techniques is feasible and a suggested base- 

 line system at 35 GHz utilizing a phased array 

 is outlined. 



2, Constraints on maximum frequency and detectability 

 requirements severely restrict the height of the 

 platform. A satellite platform is ruled out and 

 an airborne platform is limited to altitudes of 

 approximately 6 x 103 ft for the baseline system 

 considered. 



3, Detection of ships on the ocean surface is pos- 

 sible because metal ships appear cooler than the 

 sea by virtue of reflecting the sky temperature, 



66 



