Accession Number : AD0433749


Title :   COMPARISON OF THEORETICAL AND EXPERIMENTAL VALUES OF SPATIAL CORRELATION,


Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN


Personal Author(s) : Cron,Benjamin F ; Hassell,Beverly C ; Keltonic,FrankJ


Report Date : 16 Dec 1963


Pagination or Media Count : 18


Abstract : Experimental measurements of spatial correlation were made using the top 12 elements of a 40-element vertical array. The hydrophone outputs were pased through filters in the 200-400 cps, 400-600 cps, 600-800cps, and 800-1000 cps bands. Selected pairs of hydrophones were cross-correlated. The experimental values of spatial correlation were compared with the theoretical values of spartial correlation. A good agreement of the experimental results with the theoretical results is obtained in the higher pass bands. In general, the agreement is better for higher frequency bands and higher sea states. The results indicate that (1) the noise is predominantly from the horizontal direction in the 200400 cps band, (2) the noise is predominatly from the vertical direction in the other measured bands, and (3) the sources on the surface of the ocean radiate energy similar to that of a dipole source. (Author)


Descriptors :   *NOISE , *OCEANS , *UNDERWATER SOUND , SURFACES , HYDROPHONES , MAGNETIC TAPE , RECORDING SYSTEMS , SPECTRUM ANALYZERS , CORRELATION TECHNIQUES , MEASUREMENT , EXPERIMENTAL DATA , BANDPASS FILTERS , UNDERWATER SOUND SIGNALS , ACOUSTIC SIGNALS


Distribution Statement : APPROVED FOR PUBLIC RELEASE