ACOUSTIC FOGHORN FOR DIRECTIONAL SIGNALING

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

• TRT Terms: Harbors; Navigational aids; Position fixing; Ship pilotage; Signal devices; Signaling
• Old TRIS Terms: Acoustic position finding; Harbor navigation; Signaling equipment
• Subject Areas: Marine Transportation; Operations and Traffic Management; Terminals and Facilities;

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