Browsing by Subject "backscatter"
Now showing items 1-20 of 24
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A multi-sensor autonomous platform for fast ocean observation studies
(Indian National Centre for Ocean Information Services (INCOIS), 2012)A new platform Autonomous Vertical Profiler (AVP) has been developed at CSIR - National Institute of Oceanography in Goa, India that can rapidly and autonomously collect repetitive data to 200m water depth. It is equipped ... -
A neural network based seafloor classification using acoustic backscatter
(Springer-Verlag; Berlin, Heidelberg, 2002)This paper presents a study results of the Artificial Neural Network (ANN) architectures [Self-Organizing Map (SOM) and Multi-Layer Perceptron (MLP)] using single beam echosounding data. The single beam echosounder, operable ... -
A short discussion on artifact creating conditions using multibeam bathymetric systems in a highly reflecting and smooth bottom
(NIO, Dona Paula, Goa (India), 2000)Using multibeam system, artifact creating conditions are dominant when functioning in highly reflective and flat bottom areas. This simulation study manifests the causes responsible for creating such conditions which ... -
Acoustic seafloor sediment classification using self-organizing feature maps
(IEEE, 2001)A self-organizing feature map (SOFM), a kind of artificial neural network (ANN) architecture, is used in this work for continental shelf seafloor sediment classification. Echo data are acquired using an echosounding system ... -
An application of the multibeam sounder for seabed backscattering analysis
(Ultrasonics Society of India, 1994)A theoretical analysis of vertical farfield pattern for a multibeam sounder is performed. The farfield pattern for different steered angles establish the usefulness of present multibeam arrays. An interaction effect of ... -
An evaluation of the problems of chlorophyll retrieval from ocean colour, for case 2 waters
(Elsevier, 1987)A reflectance model is presented that takes into account the spectral signatures of phytoplankton, dissolved organic matter and non-chlorophyllous particles. The model is validated by comparison with observed reflectance ... -
Application of hybrid techniques (self-organizing map and fuzzy algorithm) using backscatter data for segmentation and fine-scale roughness characterization of seepage-related seafloor along the western continental margin of India
(IEEE, 2015)In this paper, a seafloor characterization technique to unravel the number of data classes using multibeam echo-sounding backscatter data has been demonstrated. An application of self-organizing maps (SOMs) to backscatter ... -
Echo-waveform classification using model and model free techniques: Experimental study results from central western continental shelf of India
(Marine Technology Society, 2005)Seafloor classifications and characterization using acoustic backscatter data from the central western continental shelf of India is presented in this work. Single beam sea-floor echo data using two frequencies: 33 kHz and ... -
Estimating deep seafloor interface and volume roughness parameters using the multibeam-hydrosweep system
(Taylor & Francis, 2002)Utilizing a hull-mounted, multinarrow beam echosounder onboard RV Polarstern, variation of acoustic backscatter with incidence angles at two different sites in the Southern Oceans (Agulhas Plateau and the Riiser Larsen ... -
Estimation of mean grain size of seafloor sediments using neural network
(Springer, 2012)The feasibility of an artificial neural network based approach is investigated to estimate the values of mean grain size of seafloor sediments using four dominant echo features, extracted from acoustic backscatter data. ... -
Model-based acoustic remote sensing of seafloor characteristics
(IEEE, 2011)The characterization of seafloor sediments by acoustic means is carried out using normal-incidence, dual-frequency, single-beam echo sounder backscatter data at 20 locations in the western continental shelf of India. A ... -
Model-based seafloor characterization employing multi-beam angular backscatter data - A comparative study with dual-frequency single beam
(Acoustical Society of America, 2011)Sediment geoacoustic inversion results are estimated employing a multi-beam (MB) echo-sounding system operable at 95 kHz. To characterize the western continental shelf of India (off Goa) seafloor, MB backscatter signals ... -
Morphology of pockmarks along the western continental margin of India: Employing multibeam bathymetry and backscatter data
(Elsevier, 2010)This study addresses the morphology of pockmarks along the western continental margin of India using multibeam bathymetry and backscatter data. Here, for the first time we have utilized the application of ArcGIS (Geographical ... -
Multifractal approach for seafloor characterization
(IEEE, 2014)This letter involves multifractal characterization of pockmark seepage associated seafloor along the central part of the western continental margin of India. Six representative blocks of backscatter and bathymetry coregistered ... -
Pseudo sidescan images from backscatter amplitude data of the Hydrosweep multibean sonar system
(NISCAIR, CSIR, 1997)Using the rms (root mean square) backscatter amplitude values, a procedure was evolved to generate pseudo sidescan images. A comparison of the pseudo sidescan image with actual Hydrosweep sidescan image, from an area ... -
Quantitative seafloor characterization using angular backscatter data of the multi-beam echo-sounding system - Use of models and model free techniques
(Allied, India, 2003)For quantitative seafloor roughness characterization and classification using multi-beam processed backscatter data, a good correlation is indicated among the power law parameters (composite roughness model) and hybrid ANN ... -
Sea-floor classification using multibeam echo-sounding angular backscatter data: A real-time approach employing hybrid neural network architecture
(IEEE, 2003)The presently studied numerical model, e.g., composite roughness, is successful for the purpose of sea-floor classification employing processed multibeam angular backscatter data from manganese-nodule-bearing locations of ... -
Seabed habitat mapping employing single and multi-beam backscatter data: A case study from the western continental shelf of India
(Elsevier, 2012)Acoustic backscatter from multi-beam echo-sounder (MBES) and dual-frequency single-beam echo-sounding systems (SBES) operable at 95 kHz and 33/210 kHz, respectively, were used to study the distribution of sediment texture ... -
Seabottom backscatter studies in the western continental shelf of India
(Academic Press, 1999)The study is initiated to observe the interaction effects of the sound signal with three different sediment bottoms in the shelf area between Cochin and Mangalore in the western continental shelf of India. An echo signal ... -
Seabottom characterization using multibeam echosounder angular backscatter: An application of the composite roughness theory
(IEEE, 2000)Composite roughness theory is used to characterize Southern Ocean bottom backscatter (multibeam) data. Spectral parameters based on Helmholtz-Kirchhof's theory (1) are determined from measured near-normal incidence values. ...