Method of creating a highly directional acoustic beam that can be swept over the water near the entrance of a harbor or channel location is described. The information provided to a boat operator as a result of the acoustic beam includes the operator's absolute bearing from the acoustic source. The nonlinear acoustic beam has a narrow beamwidth and is produced by small transducers that can be rotated in a selected scanning motion to provide a sequence of acoustic signals easily recognizable by the unaided human ear of the boat operator who is cognizant of the acoustic sequence.

  • Supplemental Notes:
    • Supersedes PAT-APPL-606 045-75
  • Corporate Authors:

    Department of the Navy

    Constitution Avenue and 18th Street, NW
    Washington, DC  United States 
  • Authors:
    • Widener, M W
  • Publication Date: 1977-2-8

Media Info

  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158255
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PATENT-4 007 437 Patent
  • Files: TRIS
  • Created Date: Aug 31 1977 12:00AM