Hull-Mounted Sonar Techniques --For steel-hulled surface 

 craft the detection range and reliability of hull mounted sonar is sig- 

 nificantly less than that routinely achieved by radar. The use of 

 acoustic beacons on desired targets provides only marginal range improve- 

 ment but can vastly improve both reliability of detection and availability 

 of classification information. Overall potential low; technique not 

 likely to become cost effective. 



Hull-Mounted Passive Listening Techniques --These tech- 

 niques are practically useless for detection since own-ship noise masks 

 wanted signals. They may have some extremely limited potential for 

 classification if fishing vessel signatures are distinctive; this capa- 

 bility can be significantly improved if beacons are used, but only if 

 a patrol vessel stops and turns off noise sources when performing classi- 

 fication function. Overall potential low; technique not likely to be- 

 come cost effective. 



Towed Passive Listening Arrays - -These arrays are only 

 marginally better than hull-mounted arrays. Overall potential low; tech- 

 nique not likely to become cost effective. 



Sea-Bottom-Mounted Passive Listening Arrays --See Volume 

 Two of the report. Overall potential low except under special circum- 

 stances. 



8. Multisource Correlation Facilities 



a. Description 



The multisource correlation facility in the context 

 of fishery zone enforcement is to accept inputs of detection and clas- 

 sification information from a variety of sensor systems and information 



90 



