Search Results - "Lyons, A.P."

Novel physical interpretations of K-distributed reverberation by Abraham, D.A., Lyons, A.P.

“…Interest in describing and modeling envelope distributions of sea-floor backscatter has increased recently, particularly with regard to high-resolution active…”
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Simulation of non-Rayleigh reverberation and clutter by Abraham, D.A., Lyons, A.P.

“…The simulation of active sonar reverberation time series has traditionally been done using either a computationally intensive point-scatterer model or a…”
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Fluid-Filled Passive Sonar Calibration Spheres: Design, Modeling, and Measurement by Deveau, D.M., Lyons, A.P.

“…Hollow spheres have long been used as simple underwater targets for testing acoustic projector systems. While spheres offer a mathematically simple shape with…”
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Reverberation envelope statistics and their dependence on sonar bandwidth and scattering patch size by Abraham, D.A., Lyons, A.P.

“…Increasing transmit waveform bandwidth in an active sonar-system results in an increase in the signal-to-reverberation power ratio in reverberation-limited…”
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High-Frequency Scattered Envelope Statistics of Patchy Seafloors by Lyons, A.P., Johnson, S.F., Abraham, D.A., Pouliquen, E.

“…The scattering properties of the individual components of seafloors consisting of discrete patches of different materials may have a complicated relationship…”
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Acoustic Observation of the Time Dependence of the Roughness of Sandy Seafloors by Jackson, D.R., Richardson, M.D., Williams, K.L., Lyons, A.P., Jones, C.D., Briggs, K.B., Dajun Tang

“…A statistical model for the time evolution of seafloor roughness due to biological activity is applied to photographic and acoustic data. In this model, the…”
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The potential impact of shell fragment distributions on high-frequency seafloor backscatter by Lyons, A.P.

“…There has been much recent activity on developing and testing high-frequency seafloor volume scattering models and on the related high-resolution…”
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Comparison of Seafloor Roughness and Scattered Acoustic Temporal Decorrelation by Gerig, A.L., Lyons, A.P., Pouliquen, E., Williams, K.L.

“…Connecting changes in acoustic scattering from the seafloor with changes in seafloor topography is essential for modeling the time dependence of the scattering…”
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The Impact of Multipath on High-Resolution SAS Image Statistics by Johnson, S.F., Lyons, A.P., Abraham, D.A.

“…As with traditional sonar, synthetic aperture sonar (SAS) is susceptible to multipath contamination, reducing the quality and also modifying the statistics of…”
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Characterization of the two-dimensional roughness of wave-rippled sea floors using digital photogrammetry by Lyons, A.P., Fox, W.L.J., Hasiotis, T., Pouliquen, E.

“…Surface roughness is a fundamental sea-floor property affecting a variety of physical phenomena including sediment transport and the interaction of acoustic…”
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Backscattering from bioturbated sediments at very high frequency by Pouliquen, E., Lyons, A.P.

“…Recent backscattering measurements made in the Gulf of La Spezia, Italy, using a sonar operating at 140 kHz combined with thorough characterization of seabed…”
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Guest Editorial Non-Rayleigh Reverberation and Clutter by Abraham, D.A., Lyons, A.P.

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Acoustic Propagation Through Clustered Bubble Clouds by Weber, T.C., Lyons, A.P., Bradley, D.L.

“…One of the underlying assumptions in the effective medium theory describing the propagation of acoustic waves through bubble clouds is that the probability of…”
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Bubble populations and acoustic interaction with the gassy floor of Eckernförde Bay by Anderson, A.L., Abegg, F., Hawkins, J.A., Duncan, M.E., Lyons, A.P.

“…Anomalies in data taken with acoustic profiling systems often have been interpreted as indications of the widespread occurrence of free gas (gaseous state…”
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Use of X-ray computed tomography for the estimation of parameters relevant to the modeling of acoustic scattering from the seafloor by Muzi, L., Lyons, A.P., Pouliquen, E.

“…Underwater sonar systems are increasingly being used at frequencies greater than 100 kHz for bathymetry measurement, seabed characterization and object…”
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Bootstrapped K-Distribution Parameter Estimation by Abraham, D.A., Lyons, A.P.

“…Parameter estimation for the K distribution is an essential part of the statistical analysis of non-Rayleigh sonar reverberation and clutter for performance…”
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The effect of a layer of varying density on high-frequency reflection, forward loss, and backscatter [seafloor acoustics] by Lyons, A.P., Orsi, T.H.

“…This paper examines the impact that a thin layer of varying density would have on high-frequency reflection, forward loss, and backscattering of acoustic plane…”
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Roughness Spectra and Acoustic Response from a Diver-Manipulated Sea Floor by Briggs, K.B., Richardson, M.D., Williams, K.L., Lyons, A.P.

“…A digital stereo photogrammetric system was designed and implemented to measure seafloor roughness in coastal sands. High-resolution images that achieve more…”
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Modeling acoustic volume backscatter from two shallow-water marine environments by side-scan sonar by Lyons, A.P., Anderson, A.L., Orsi, T.H.

“…The authors use X-ray computed tomography (CT) of cores to provide three dimensional seafloor descriptions on scales much smaller than 1 cm/sup 3/. This scale…”
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Exponential scattering and K-distributed reverberation by Abraham, D.A., Lyons, A.P.

“…Active sonar systems have been developed using larger arrays and broadband sources to counter the detrimental effects of reverberation in shallow water…”
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