A Further Study of the Space and Time Stability of a Narrowband Acoustic Signal in the Ocean: Short Range Results: A Paper Presented at the 102nd Meeting of the Acoustical Society of America, 1 December 1981, Miami Beach, Florida
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
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This document presents the oral and visual presentation entitled A Further Study of the Space and Time Stability of a Narrowband Acoustic Signal in the Ocean Short Range Results, presented at the 102nd Meeting of the Acoustical Society of America, 1 December 1981, in Miami Beach, Florida. In the last of a three paper series on the space and time stability of a narrowband acoustic signal, results from short 16-17 nmi ranges are presented. In contrast to the data obtained at longer ranges P. D. Herstein, et al., J. Acoust. Soc. Am. 69 S1, S33A, 1981, an increased frequency spread was found in the received signal due to the greater number of possible raypaths at short ranges. A marked change in the character of the received signal was observed at ranges less than 70 nmi. Space and time variability are given for percentage Doppler shift and bandwidth. Comparison is made to data reported in the two previous papers and with predictions of the Multipath Expansion Option of the Generic Sonar Model.
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