By J. Lynch, A. Fredricks, J. Colosi, G. Gawarkiewicz, A. Newhall, C.S. Chiu, M. Orr (auth.), Nicholas G. Pace, Finn B. Jensen (eds.)
The restricting impression of our environment on sonar has lengthy been recognized as an important problem to technological know-how and expertise. because the niche shifts in the direction of the lit toral, environmental impacts turn into dominant either in time and area. The manyfold demanding situations surround prediction, size, evaluation and adaptive responses to maximise the effectiveness of platforms. even though MCM and ASW actions are dom inated in numerous methods and scales through the surroundings, either battle parts have needed to contemplate the considerably altering specifications posed by way of operations within the littoraL the basic clinical matters focused on constructing versions touching on acoustics to the surroundings are matched in hassle through the necessity for facts for his or her validation and eventual useful use for prediction. often the necessity is for online edition of structures to altering situations while different wishes are for the Ionger time period making plans actions. This publication and the hooked up full-color CD are the court cases of a convention organ ised through the SACLANT Undersea examine Centre, held at Villa Marigola, Lerici, Italy, on 16-20 September 2002. the elemental difficulties linked to environmental 1 variability and sonar have been explored at a prior SACLANTCEN convention in 1990. those difficulties haven't long gone away yet, at the one hand are exaggerated by way of the circulation to the littoral and however, are open to treatrnent in new ways in which advances in know-how and machine strength allow.
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Additional info for Impact of Littoral Environmental Variability of Acoustic Predictions and Sonar Performance
Comparison between predicted and measured salinity, (a) Raw data, (b) Filtered data to outline the non-tidal variations of the salinity. The solid line represents acoustically predicted value of salinity and the dotted line shows the measured value 2 m below the sea surface. 5 Summary Concurrent oceanographic and acoustic observations were conducted in shallow water region of Delaware Bay. The purpose of these tests was to understand the correlation between the oceanographic features and the high frequency acoustic wave propagation.
21, 2000 (right), before and after passage ofhurricane. AXBT drop sites shown as numbered red dots. Data from the REA surveys on Oct. 14 and Oct. 21 show a similar I oe drop in surface temperature caused by the hurricane. 5 m, are shown as temperature contour plots in Fig. 5. The water column temperature structure before and after Michael is shown in transects from west to east through the rniddle of the two REA surveys in Fig. 6. The I oe drop in surface temperature between the surveys can be seen to extend throughout the rnixed layer.
4. , Simmen, J. , Frequency dependence of broadband acoustic propagation in coastal environment, J. Acoust. Soc. Am. 101, No. 6 (1997). 5. , Simmen, J. , Signal variability in shallow-water sound channels, IEEE Journa/25, No. 4, 492-500 (2000). INSTRUMENTED TOW CABLE MEASUREMENTS OF TEMPERATURE VARIABILITY OF THE WATER COLUMN ANTHONY A. RUFFA AND MICHAEL T. mil The Instrumented Tow Cable (ITC) measures the temperature variability of the water column with a spatial resolution of \1, meter along the cable and a temporal resolution on the order of 100 seconds.
Impact of Littoral Environmental Variability of Acoustic Predictions and Sonar Performance by J. Lynch, A. Fredricks, J. Colosi, G. Gawarkiewicz, A. Newhall, C.S. Chiu, M. Orr (auth.), Nicholas G. Pace, Finn B. Jensen (eds.)