Transverse Horizontal Coherence and Low-Frequency Array Gain Limits in the Deep Ocean
Abstract
This report is a major output of a program in spatial properties of low-frequency acoustic fields in the deep ocean. This project was instituted at the Naval Research Laboratory in 1974 to provide a priori estimates of the capabilities and limitations of large-array performance due to coherence degradation from environmental causes. The project work has emphasized stochastic propagation measures of irregularities in the ocean. This approach has been followed to provide probabilistic predictions of the expected environmental limits to aperture designs. Only volume effects are treated in the present work to provide the outside practical limit on resolution, and hence size, of low-frequency arrays that our present knowledge of the internal structure of the deep ocean will permit. The special objective of this report is the presentation of an algorithm, the supporting theory of which has previously been published, which has subsequently been supported with a series of experimental investigation of the transverse horizontal coherence properties of the acoustic field following long-range propagation in the deep ocean. From this algorithm the gain of an array can be calculated provided it is restricted to those instances where bottom and surface interaction play a minor part in the overall intensity of the received field.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 09, 1983
- Accession Number
- ADA131916
Entities
People
- Budd B. Adams
- Dennis M. Dundore
- John J. Mccoy
- L. B. Palmer
Organizations
- United States Naval Research Laboratory