Accession Number:

ADA011123

Title:

Effects of a Fluctuating Temperature Field on the Spatial Coherence of Acoustic Signals.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Beran,M. J.
• McCoy,J. M.
• Adams,B. B.

Report Date:

1975-05-22

Pagination or Media Count:

49.0

Abstract:

A Theoretical model has been developed for predicting the loss of spatial coherence of moderately low frequency acoustic signals 50 to 300 Hz that results from the presence of a fluctuating temperature field caused by internal waves and by ocean turbulence. The model has been used to estimate limitations on the maximum useful length of a horizontal, linear, phased array the performance of which is degraded by the presence of the fluctuating temperature field.

Descriptors:

• *ACOUSTIC ATTENUATION
• *UNDERWATER SOUND
• SIGNAL PROCESSING
• TEMPERATURE
• POWER SPECTRA
• NUMERICAL INTEGRATION
• STATISTICAL ANALYSIS
• ACOUSTIC VELOCITY
• INTERNAL WAVES
• BESSEL FUNCTIONS

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE