The Effect of Source Speed on the Time Scale of Acoustic Fluctuations.
Abstract
The time scale of acoustic fluctuations has been found to depend on source speed for a shallow receiver-shallow sound source configuration in deep water off the coast of St. Croix, U.S. Virgin Islands. Measurements were made of a cw 135 hz source towed at 4 and 8 knots on a 5-mile tangential track through a point 7.5 miles from the receiving hydrophones. Using the correlation time, the time it takes an autocorrelogram to decay to (1/e) of its maximum value as a norm or standard, the higher source speed consistently gave rise to shorter correlation times. As the data integration period was increased from 5 seconds to 100 seconds, the measured correlation times increased as well, covering the range of 4 to 462 seconds for various source speed-receiver depth combinations. As a function of integration time, the difference between the correlation times at the two speeds became greater for a receiver located in the thermal layer than for a receiver beneath the layer. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1976
- Accession Number
- ADA054118
Entities
People
- I. J. Rosenbaum
Organizations
- Naval Ordnance Laboratory