basic research, it is believed that if their requirements are met 

 many of the Bureau's requirements will be satisfied simultaneous- 

 ly. Certain of our problems, on the other hand, are peculiar to 

 our work and will require special attention. 



A brief review of the oceanographic programs of the Bureau 

 of Naval Weapons is in order: 



Radar Surveillance: Work in this area generally relates to studies 

 of surface waves as they affect radar signals in an attempt to learn 

 more about the detection of surfaced or snorkeiing submarines in 

 various sea conditions. 



Sonar Surveillance: This work relates to two areas. One is the 

 development of towed and dipped helicopter sonars. The other re- 

 lates to bearing accuracy of sonars at long ranges. Much of this 

 is concerned with acoustic transmission in the medium. 



Magnetic-Electro Surveillance: Work in this area relates to the 

 detection of submarines using MAD (Magnetic Anomaly Detection) 

 equipment. The type of information required is basic geomagnetic 

 background measurements as an input to the development program. 



Sonobuoy Surveillance: The work here is twofold. With regard to 

 acoustic sonobuoys the interest is in obtaining acoustic data re- 

 lating to sonobuoy use. Second, we are interested in the use of 

 explosive echo ranging for submarine detection. This latter prob- 

 lem requires tests in the ocean on propagation, reverberation, etc., 

 of explosive waves. 



Fire Control Sonar: This concerns hull-mounted fire control sonar. 

 The work conducted here in the oceanographic area is basically 

 sound coherency measurements. 



Torpedo Guidance and Control: This area represents the largest 

 portion of our oceanographic effort, and relates to the development 

 of acoustic homing torpedoes. Fairly extensive programs are 

 carried on in (1) acoustics of the medium, which includes scatter- 

 ing, reverberation, propagation, etc. , in the particular frequency 

 ranges of interest, and (2) acoustics of the target which include 

 active and passive acoustics of a submarine in the operating medium. 



Torpedo Hydrodynamics : In this field, a relatively small amount of 

 oceanographic work is done principally in the area of drag reduction. 



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