I 



UNDERSEA TECHNOLOGY 83 



Continuing experiments will reveal more about the complex nature of 

 target strengths of submarines, leading to the abiUty to synthesize a com- 

 plex target into more simple ones. Distortion in the waveform of various 

 types of acoustic signals is being investigated, as is the relationship between 

 signal phase stability and environmental parameters. 



The results of these experiments are being correlated with data acquired 

 by the Marine Geophysical Surveys program. Begun in 1965 by the Naval 

 Oceanographic Office, the goal is to make a comprehensive study of about 

 15 percent of the ocean floor and determine its effect on sound propaga- 

 tion. Measurements are being made of both acoustic and physical prop- 

 erties of the ocean bottom. 



Measurements in various enviroiunents are being made to determine 

 effects of oceanographic conditions on range and bearing accuracy of long- 

 range sources, with a view to improving the accuracy of fire-control solu- 

 tions in long-range antisubmarine weapon systems. 



