MEASUREMENTS OF THE SPATIAL CORRELATION OF AMBIENT NOISE USING A DEEP- SUBMERGENCE VEHICLE (DIVING SAUCER SP-300)
NAVY UNDERWATER SOUND LAB NEW LONDON CT
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During February and March 1965, experimental measurements were made of the spatial correlation of ambient noise in the horizontal and vertical planes at two different depths using Diving Saucer SP-300 as a measuring platform. A hydrophone array, which was designed to form a geometrically spaced line array that could be rotated to receive data in either plane, was attached to the SP-300. The hydrophone outputs were band-passed through 4001200 cps Butterworth filters and recorded on a sevenchannel, battery-operated tape recorder. The recorded data were played back through 400-600, 600-800, 800- 1000, and 1000-1200 cps filters and selected pairs were crosscorrelated. Good agreement was found between the experimental values of spatial correlation and the theoretical values, except when measurements were hampered by shipping in the area and pitch and roll and rotation of the SP-300.