Accession Number:

AD0420335

Title:

DIRECTIONAL PROPERTIES OF UNDER-ICE AMBIENT ACOUSTIC NOISE,

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

Report Date:

1963-08-28

Pagination or Media Count:

15.0

Abstract:

The outputs of a pair of hydrophones suspended beneath the ice and separated sometimes vertically 210 feet and sometimes horizontally 359 feet were tape recorded. In order to measure directional properties of the ambient noise so recorded, the tapes were analyzed using polarity coincidence crosscorrelation. The results showed low frequency correlation as high as 34 percent and some high frequency correlation, probably resulting from marine life and strumming antenna wires in camp, as high as 6 percent. The correlation was generally stable over a period of minutes and often hours. Selected correlation functions are shown. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE