Accession Number : AD0762409

Title :   Rotating Acoustic Stereo Scanner for Positioning Loads onto the Seafloor: Preliminary Observations on an Experimental Model.

Descriptive Note : Final rept. Jul 71-Jun 72,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Hitchcock,R. D.

Report Date : APR 1973

Pagination or Media Count : 56

Abstract : An experimental model of a rotating acoustic stereo scanner (RASS) was tested in water depths to 115 feet to obtain pairs of sonar images and to determine the feasibility of using these stereo-image pairs to triangulate the positions of artificial sonar targets located at unknown elevations and radial distances. A high-resolution, side-looking sonar transducer with a maximum range of 80 feet was mounted on a hydraulically driven, rotating table attached to the top of a botton-resting tripod. Target recognition was performed manually on shore. It was determined that the best type of artificial target for acoustic triangulation is a triangular-shaped triplane having dimensions on the order of 1 foot. An angular scanning rate of 2.0 deg/sec produced images which presumably could be recognized electronically by Fourier transform techniques. Rotational scanning and acoustic triangulation could be completed within 100 seconds. (Modified author abstract)

Descriptors :   (*SONAR EQUIPMENT, ACOUSTIC DETECTORS), (*UNDERWATER EQUIPMENT, POSITION FINDING), OCEAN BOTTOM, DEEP WATER, ECHO RANGING, OCEAN BOTTOM TOPOGRAPHY, MAPPING, TARGET ACQUISITION, CIRCULAR ERROR PROBABLE, TRIANGULATION

Subject Categories : Marine Engineering
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE