Volume Propagation Experiments at the Azores Fixed Acoustic Range.
Abstract
Acoustic propagation over two purely refracted undersea paths is characterized by coherence lengths in the time, frequency, and space domains. Intensity fluctuations are quantified by the variance of log intensity. Measurements have been carried out on 1.5 and 18 nmi paths at the Azores Fixed Acoustic Range (AFAR) over the decade of acoustic frequencies from 500 to 5000 Hz. The 18 nmi path breaks up into 'micropaths,' resulting in self-interference of the deterministic ray. The long experiment averaging times, onsite oceanographic measurements, and repeatability of results make the results useful in the evaluation of acoustic propagation models. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 21, 1979
- Accession Number
- ADA075742
Entities
People
- Barry G. Buehler
Organizations
- Naval Underwater Systems Center