Accession Number : ADA310700

Title :   The Effect of Turbulent Intermittency on Detection in Acoustic Shadows.

Descriptive Note : Final rept.,

Corporate Author : ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM

Personal Author(s) : Wilson, D. K.

PDF Url : ADA310700

Report Date : MAY 1996

Pagination or Media Count : 42

Abstract : This report discusses the effect of turbulent intermittency (the tendency of turbulence to occur in bursts or activity) on large angle acoustic scattering and source detection and shows how intermittency increases the occurrence of high intensity scattering events. Source detection probabilities strongly depend on the occurrence of these events, as well as the noise background characteristics. Detection probability calculations are made for a variety of noise scenarios. Intermittency increases the detection probabilities by several orders of magnitude if the signal-to-noise ratio (SNR) is low and the noise background has relatively little variance. The intermittency effect becomes less significant in high SNR situations and highly variable noise environments. This report also discusses estimation of the parameters required by the intermittency theory from standard micrometeorological measurements.

Descriptors :   *ACOUSTIC DETECTION, *ACOUSTIC SCATTERING, *SHADOWS, ANGLES, COMPUTATIONS, PROBABILITY, SIGNAL TO NOISE RATIO, TURBULENCE, ACOUSTIC MEASUREMENT, HIGH INTENSITY, BACKGROUND NOISE, NOISE(SOUND), MICROMETEOROLOGY.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE