Long-Range Propagation Loss Measurements of Project TRANSLANT I in the Atlantic Ocean East of Bermuda
Abstract
Long-range (1400 nmi) underwater acoustic propagation measurements were made from 26 September to 14 October 1971, during TRANSLANT I. Three-pound explosive charges detonated at 60 and 500 ft were used as sound sources, and the signals were received on hydrophones at different locations and depths near Bermuda. The purpose of the exercise was to measure propagation loss and signal- to-noise ratios as dependent upon range, frequency, source depth, receiver depth, and topographic features, such as seamounts and the Mid-Atlantic Ridge. Besides providing a data base against which to check acoustic models for the subject area and climatic conditions, the data were to be compared with similar data taken in January and February 1971. Considering all ranges and frequencies up to 200 Hz, propagation losses from 60-ft sources averaged about 6 dB greater than for 500-ft sources for hydrophones at depths of 10,900 and 4,650 ft. A similar difference between propagation losses for shallow as opposed to deep sources was found at 25 Hz for receivers at depths of 14,000 and 14,706 ft. For 50, 100, and 200 Hz, losses from both shallow and deep sources were about the same to the deep receivers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 12, 1974
- Accession Number
- ADC001521
Entities
People
- David M. Potter
- Frederick C. Friedel
- John P. Beam
- Robert F. Laplante
Organizations
- Naval Underwater Systems Center