منابع مشابه
Nonlinear Underwater Acoustics
Chapter 2. Methods of calculation of Nonlinear interactions in sound beams Small parameters used in the calculation of wave interactions Solution of the equations of hydrodynamics by the method of successive approximations Calculation of the secondary field by the Green's function method: The Westervelt formula Estimates of the basic characteristics of parametric radiators by means of nomograms...
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The paper presents an overview of the inverse problems associated with applications of underwater acoustics. The problems are classified into four main categories, according to the recoverable quantities : Acoustic source localization, bottom identification, ocean acoustic tomography and target recognition. The paper gives emphasis to the three first categories, and includes methods to solve th...
متن کاملReal-time Weather Monitoring Using Underwater Acoustics
Acoustic rain gauges have long been espoused as a possible means of monitoring wind and rainfall in regions far from land-based measurements. The rapid provision of data from such systems could contribute to weather forecasting. This paper provides an overview of a recent equipment trial off Galway, during which wind speeds in excess of 30m s -1 were encountered. The deployment also tested the ...
متن کاملMulti-vehicle Dynamic Pursuit Using Underwater Acoustics
Marine robots communicating wirelessly is an increasingly attractive means for observing and monitoring in the ocean, but acoustic communication remains a major impediment to real-time control. In this paper we address through experiments the capability of acoustics to sustain highly dynamic, multi-agent missions, in particular range-only pursuit in a challenging shallow-water environment. We p...
متن کاملConstrained Channel Estimation Methods in Underwater Acoustics
Underwater acoustic signal processing aims to reconstruct the shallow water acoustic channel from both direct arrival and delayed multipath reflections. This enables accurate acoustic communications in shallow water, such as between underwater autonomous vehicles (UAVs), which are essential for coastal surveillance and other applications. In this work, we take a previously implemented algorithm...
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ژورنال
عنوان ژورنال: Nature
سال: 1971
ISSN: 0028-0836,1476-4687
DOI: 10.1038/233290b0