COMPARISON OF THEORETICAL AND EXPERIMENTAL VALUES OF SPATIAL CORRELATION

摘要

Experimental measurcnunis of spatial correlation were made using the top 12 elements of a 40-element vertical array. The hydrophone outputs were passed through filters in. the 200-400 cps, 400-600 cps, 600-800 cps, and 800-1000 cps bands. Selected pairs of hydro phones were cross-correlated. The experimental values of spatial correlation were compared with the theoretical values of spatial 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 200-400 cps band,n(2) the noise is predominantly from the vertical direction in the other measured bands, andn(3) the sources on the surface of the ocean radiate energy similar to that of a dipole source.