Impact of Littoral Environmental Variability on Acoustic Predictions and Sonar Performance

Impact of Littoral Environmental Variability on Acoustic Predictions and Sonar Performance

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Kluwer Academic Publishers


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Impact of Littoral Environmental Variability on Acoustic Predictions and Sonar Performance

The limiting influence of the environment on sonar has long been recognised as a major challenge to science and technology. As the area of interest shifts towards the littoral, environmental influences become dominant both in time and space. The manifold challenges encompass prediction, measurement, assessment, and adaptive responses to maximize the effectiveness of systems. Although MCM and ASW activities are dominated in different ways and scales by the environment, both warfare areas have had to consider the significantly changing requirements posed by operations in the littoral. The fundamental scientific issues involved in developing models relating acoustics to the environment are matched in difficulty by the need for data for their validation and eventual practical use for prediction. In many instances the need is for the longer term planning activities. This book and the enclosed CD-ROM are the proceedings of a conference organised by the SACLANT Undersea Research Centre, and held at the Villa Marigola, Lerici, Italy, on 16-20 September 2002.
CD-ROM Included: This volume contains a CD-ROM which in addition to an electronically searchable version of the proceedings, has full colour versions of figures which are printed in black and white in the book.

Product Details

ISBN-13: 9781402008160
Publisher: Kluwer Academic Publishers
Publication date: 08/28/2002
Edition description: BK and CD-ROM
Pages: 640
Product dimensions: 6.60(w) x 9.66(h) x 1.23(d)

Table of Contents

Section 1Ocean variability1
Acoustic effects of environmental variability in the SWARM, PRIMER and ASIAEX experiments3
Acoustic intensity variability in a shallow water environment11
Combination of acoustics with high resolution oceanography19
Effect of hurricane Michael on the underwater acoustic environment of the Scotian Shelf27
High-frequency acoustic propagation in the presence of oceanographic variability35
Instrumented tow cable measurements of temperature variability of the water column43
Mesoscale--small scale oceanic variability effects on underwater acoustic signal propagation49
Spatial coherence of signals forward scattered from the sea surface in the East China Sea55
Variability in high frequency acoustic backscattering in the water column63
Section 2Seabed variability71
Intra- and inter-regional geoacoustic variability in the littoral73
Acoustic and in-situ techniques for measuring the spatial variability of seabed geoacoustic parameters in littoral environments83
Measurements of bottom variability during SWAT New Jersey Shelf experiment91
Mapping seabed variability using combined echosounder and XBPs for sonar performance prediction99
Variability of shear wave speed and attenuation in surficial marine sediments107
In-situ determination of the variability of seafloor acoustic properties: An example from the ONR Geoclutter area115
Calculation of in situ acoustic wave properties in marine sediments123
Sub-bottom variability characterization using surface acoustic waves131
The influence of noise and coherence fluctuations on a new geo-acoustic inversion technique139
Estimating shallow water bottom geo-acoustic parameters using ambient noise147
Effect of environmental variability on model-based signal processing: Review of experimental results in the Mediterranean155
Rapid geoacoustic characterization for limiting environmental uncertainty for sonar system performance prediction163
Environmental uncertainty in acoustic inversion171
Measuring the azimuthal variability of acoustic backscatter from littoral seabeds179
Backscatter from elastic ocean bottoms: Using the small slope model to assess acoustical variability and uncertainty187
Spatial and temporal variability in bottom roughness: Implications to high frequency subcritical penetration and backscatter195
Variability of bottom backscattering strength in the 10-500 kHz band at shallow grazing angles203
Predicting scattered envelope statistics of patchy seafloors211
The effect of seabed backscattering variability on the probability of detection and on the performance of seabed classification algorithms219
Section 3Acoustic fluctuations: Measurements227
Effects of environmental variability on acoustic propagation loss in shallow water229
Broadband acoustic signal variability in two "typical" shallow-water regions237
Variability, coherence and predictability of shallow water acoustic propagation in the Straits of Florida245
Ambient noise and signal uncertainties during the summer shelfbreak PRIMER exercise255
Variability effects due to shallow sediment gas in acoustic propagation: A case study from the Malta Plateau263
Acoustic fluctuations and their harmonic structure271
Group and phase speed analysis for predicting and mitigating the effects of fluctuations279
High-frequency propagation for acoustic communications287
Channel impulse response fluctuations at 6 kHz in shallow water295
High resolution analysis of eigenray gain perturbations in ultra-shallow water303
Impact of flow variability on fixed side-looking 100 kHz sonar performance in a shallow channel311
Correlation between sonar echoes and sea bottom topography319
Section 4Acoustic fluctuations: Models327
Acoustic scattering in wave-covered shallow water. The coherent field329
Simulations of temporal and spatial variability in shallow water propagation337
Assessing the variability of near-boundary surface and volume reverberation using physics-based scattering models345
Modeling propagation and reverberation sensitivity to oceanographic and seabed variability353
Uncertainty in reverberation modelling and a related experiment361
Statistics of the waveguide invariant distribution in a random ocean369
Effects of environmental variability on focused acoustic fields377
Effects of sound speed fluctuations due to internal waves in shallow water on horizontal wavenumber estimation385
Relative influences of various environmental factors on 50-1000 Hz sound propagation in shelf and slope areas393
Sub-mesoscale modeling of environmental variability in a shelf-slope region and the effect on acoustic fluctuations401
Yellow Sea internal solitary wave variability409
Four-dimensional data assimilation for coupled physical-acoustical fields417
Source localization in a highly variable shallow water environment: Results from ASCOT-01425
Experimental testing of the blind ocean acoustic tomography concept433
Benchmarking geoacoustic inversion methods for range dependent waveguides441
Adjoint-assisted inversion for shallow water environment parameters449
Tidal effects on MFP via the INTIMATE96 test457
Multipath effect on DPCA micronavigation of a synthetic aperture sonar465
Sea surface simulator for testing a synthetic aperture sonar473
Using a faceted rough surface environmental model to simulate shallow-water SAS imagery481
A study of ping-to-ping coherence of the seabed response489
Variability of the acoustic response from spherical shells buried in the seabed by model-based analysis of the at-sea data497
Section 5Sonar signal processing and performance predictions505
Performance bounds on the detection and localization in a stochastic ocean507
Robust adaptive processing in littoral regions with environmental uncertainty515
A robust model-based algorithm for localizing marine mammal transients523
Assessment of the impact of uncertainty in seabed geoacoustic parameters on predicted sonar performance531
Reverberation envelope statistics and their dependence on sonar beamwidth and bandwidth539
The role of nowcast and forecast input parameters for range dependent transmission models547
Are current environmental databases adequate for sonar predictions in shallow water?555
Yellow Sea acoustic uncertainty caused by hydrographic data error563
Detection of sonar induced measurement uncertainties in environmental sensing: A case study with the toroidal volume search sonar571
Environmental variability of the LBVDS sea tests579
AREA: Adaptive Rapid Environmental Assessment587
Environmentally adaptive sonar control in a tactical setting595
Transfer of uncertainties through physical-acoustical-sonar end-to-end systems: A conceptual basis603
Sonar performance predictions incorporating environmental variability611
Author Index619
Including a CD-Rom with a.o. color images

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