Accession Number : AD0667708

Title :   POSITION DETERMINATION NEAR THE SEA FLOOR,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB

Personal Author(s) : Lowenstein,Carl D.

Report Date : JAN 1968

Pagination or Media Count : 6

Abstract : Exploration or search operations close to the deep sea floor frequently require accurate position determination. Many techniques have been proposed but few have actually been applied. This paper describes actual utilization of a transponder system in conjunction with deeply towed (about 5 km deep) instruments in the conduct of fine-scale surveys of three deep ocean areas in the Northeastern Pacific. In each area three transponders were used, with spacings varying between 2 and 15 km. Computational techniques have been applied to determine transponder locations utilizing all observations in which three transponders were simultaneously within range. Use of these numerical methods yields an estimate of the uncertainty (least squares fitting residuals) in measurements of range as made with this equipment which falls in the three cases between 3 and 20 meters. Useful range information is obtained to distances which are generally limited by the combination of topography/vehicle depth and sound velocity profile. They have shown in situ reliability compatible with the design goal of one year's operation. (Author)

Descriptors :   (*OCEAN BOTTOM, *POSITION FINDING), DEEP SUBMERGENCE, UNDERWATER VEHICLES, ECHO RANGING, UNDERWATER SOUND, TRANSPONDERS, UNDERWATER EQUIPMENT, DEPTH FINDING, TOWED BODIES, DESIGN, LEAST SQUARES METHOD, MATHEMATICAL ANALYSIS, PACIFIC OCEAN

Subject Categories : Physical and Dynamic Oceanography
      Seismic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE