[PDF] Underwater Sound Propagation Paths Between Perth Australia And Bermuda Theory And Experiment eBook

Author : J. Northrop
Publisher :
Page : 17 pages
File Size : 42,16 MB
Release : 1980
Category :
ISBN :

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Oceanic great circle paths of nearly 180 deg of arc exist between the water just west of Perth, Australia, and Bermuda. Archived sound-speed profiles at eight locations along this path were used, along with bathymetric data, as input to the RAYWAVE ray-tracing program to compute the effective horizontal sound speed and propagation loss over slightly different paths of 19,762.9 km and 19,806.8 km range. The sound speeds thus computed were 1480.9 + or - 0.9 and 1479.8 + or - 0.6 m/s, which compare favorably with the previously measured sound speeds (1484.7 + or - 3.7 and 1481.48 + or - 0.6 m/s, respectively). Propagation loss of 162 dB over this propagation path is effectively modeled by assuming spherical spreading out a range of 10 nautical miles and semispherical spreading (15 log r) beyond, plus attenuation of 1.75 dB per 500 nautical miles. The RAYWAVE propagation loss prediction, after adjustment of the propagation path around Crozet Island, is 156 dB in the 10- to 50-Hz band. (Author).

Author : M. Weydert
Publisher : CRC Press
Page : 786 pages
File Size : 42,40 MB
Release : 2004-01-14
Category : Architecture
ISBN : 1482286858

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This book represents the proceedings of the Conference on Underwater Acoustics, held in September 1992, to bring together all the various disciplines involved in a forum to present the latest research on all aspects of marine acoustics.

Author : Raymond L. Veenkant
Publisher :
Page : 156 pages
File Size : 37,32 MB
Release : 1972
Category :
ISBN :

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The study is part of a continuing program of underwater sound propagation research called project MIMI. The report covers reception and processing and a limited number of analytic comments. The test timing and duration were chosen to allow closer examination of propagation anomalies previously observed during the early winter and to obtain continuous data on an entire lunar-tide cycle (approximately 28 days). The major objectives were to provide data for the design of more extensive experiments and to test the programs and techniques associated with the LINC-8 computer. Signal processing was designed to yield both multipath information and data on anomalous path conditions. The principal success of the study has been in the improvement of processing programs and experiment design. (Author).