Accession Number : AD0748651

Title :   Final Report,

Corporate Author : TEXAS UNIV AUSTIN APPLIED RESEARCH LABS

Personal Author(s) : Shirley,Donald J. ; Plemons,Terry D. ; Hampton,Loyd D.

Report Date : 02 AUG 1972

Pagination or Media Count : 42

Abstract : Presented are the preliminary results of the analysis of underwater acoustic signals generated in a model tank by a spatially distributed source with an oscillatory motion of plus or minus 1.0 degree/sec. In addition to the target motion a time variation was injected into the medium by inducting waves on the water's surface. By studying the cross-correlation matrices of various sets of signals it was concluded, under the geometry of this experiment, that target motion, and not the effects of the rough surface, is the dominating factor in causing ping-to-ping variations among certain classes of acoustic signals. However, it should be emphasized that these results are based only on this particular experimental geometry. It is very possible that under other experimental geometries the surface motion will play the dominating role of injecting a randomness into an ensemble of acoustic signals. Suggestions for additional and more detailed research in this area are given. (Author)

Descriptors :   (*UNDERWATER SOUND, CORRELATION TECHNIQUES), SURFACE ROUGHNESS, PERIODIC VARIATIONS, AMPLITUDE MODULATION, TARGET RECOGNITION, STOCHASTIC PROCESSES, GRAPHICS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE