Browsing by Author "Chakraborty, B."
Now showing items 21-40 of 92
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Characterization of Yellow Seahorse Hippocampus kuda feeding click sound signals in a laboratory environment: an application of probability density function and power spectral density analyses
Chakraborty, B.; Saran, A.K.; Kuncolienker, D.S.; Sreepada, R.A.; Haris, K.; Fernandes, W.A. (Taylor and Francis, 2014)Do the sounds generated by different-sized fish of different sexes differ from each other in temporal, spectral or intensity patterns? Such differences would enable the development of passive acoustic techniques to locate ... -
Characterizing biogenous sediments using multibeam echosounder backscatter data - Estimating power law parameter utilizing various models
Chakraborty, B.; Kodagali, V.N. (The Acoustical Society of India, 2001)In this paper, Helmholtz-Kirchhoff (H-K) roughness model is employed to characterize seafloor sediment and roughness parameters from the eastern sector of the Southern Oceans The multibeam- Hydroswcep system's angular-backscatter ... -
Characterizing Indian Ocean manganese nodule-bearing seafloor using multi-beam angular backscatter
Chakraborty, B.; Kodagali, V.N. (Springer, 2004)Application of quantitative angular backscatter modelling to manganese nodule-bearing areas of the Central Indian Ocean Basin (CIOB) has been initiated at NIO during the year 1998. Studies were aimed to establish the ... -
Characterizing slope morphology using multifractal technique: a study from the western continental margin of India.
Chakraborty, B.; Karisiddaiah, S.M.; Menezes, A.A.A.; Haris, K.; Gokul, G.S.; Fernandes, W.A.; Kavitha, G. (Springer, 2014)Here, we present the slope configuration of the submarine gullies, ridges and the adjacent slump zone off Goa, along the western continental margin of India utilizing multibeam bathymetric and single-channel seismic data. ... -
Characterizing the estuarine riverbed using acoustic technique
Chakraborty, B.; Menezes, A.A.A.; Muthukumar, K.; Fernandes, W.A.; Saran, A.K.; Mehra, P. (IEEE, 2010)Single transact of multi-beam bathymetry and backscatter data is acquired from Mandovi estuary of Goa, India for three days during the pre-monsoon session. The measurements were made during the high tide. In this work, ... -
Characterizing three shallow-water locations off Goa, India, using passive acoustic data
Chanda, K.; Chakraborty, B.; Mahale, V.; Latha, G.; Fernandes, W.A. (Acoustical Society of America (ASA), 2020)In this study, an analysis of the passive acoustic data is carried out for the quantitative characterization of shallow-water acoustic environments from three major estuarine systems of Goa during the months of March and ... -
Coaxial circular array for underwater transducer application - a critical appraisal of its effectiveness
Chakraborty, B. (American Association of Physics Teachers, 1988) -
Coaxial circular array: Studies related to sidelobe suppressed beam patterns for underwater transducer application
Chakraborty, B. (IEEE, 1988) -
Coaxial circular array: Study of farfield pattern and field frequency responses
Chakraborty, B. (Acoustical Society of America, 1986) -
Determination of nodule coverage parameters using multibeam normal incidence echo characteristics: A study in the Indian Ocean
Chakraborty, B.; Pathak, D.; Sudhakar, M.; Raju, Y.S.N. (Taylor and Francis, 1997)A study of the echo peak amplitudes from known nodule areas is initiated to observe the acoustic response for varying nodule abundances and number densities. A statistical study of the peak amplitudes from different nodule ... -
Determining seabed backscatter parameters using Multibeam-Hydrosweep System
Chakraborty, B.; Hagen, R.; Schenke, H.W. (Crete University Press, Crete, 1996) -
Development of multi-channel data logger for passive acoustic measurements
Fernandes, W.A.; Agarvadekar, Y.; Chakraborty, B. (Acoustical Society of India, 2018)Recording of passive acoustic data involves a listening device along with an instrumentation system. The passive listening device transforms mechanical disturbances to electrical signals. The subsequent sampling and logging ... -
Duel frequency echo data acquisition system for sea-floor classification
Navelkar, G.S.; Desai, R.G.P.; Chakraborty, B. (Allied, India, 2005)An echo data acquisition system is designed to digitize echo signal from a single beam shipboard echo-sounder for use in sea-floor classification studies using a 12 bit analog to digital (A/D) card with a maximum sampling ... -
Echo-waveform classification using model and model free techniques: Experimental study results from central western continental shelf of India
Chakraborty, B.; Navelkar, G.S.; Desai, R.G.P.; Janakiraman, G.; Mahale, V.; Fernandes, W.A.; Rao, N. (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 ... -
Effect of scattering due to seafloor microrelief on a multifrequency-sonar seabed profiler
Chakraborty, B. (Acoustical Society of America, 1989) -
Estimating deep seafloor interface and volume roughness parameters using the multibeam-hydrosweep system
Chakraborty, B.; Schenke, H.W.; Kodagali, V.N.; Hagen, R. (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
De, C.; Chakraborty, B. (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. ... -
Evidence for underwater current activity on the upper slope of the carbonate platform off western India using multibeam bathymetry
Chakraborty, B.; Rao, V.P.; Salkar, T.; Mahale, V.; Kurien, J. (Current Science Association & Indian Academy of Sciences, 2019)This note presents multi-beam bathymetry data from the carbonate platform on the outer continental shelf of the northwestern margin of India at water depths between 60 and 90 m. This study analyze effect of underwater ... -
Field evaluation of navigational sensors using DGPS/GPS for a small AUV
Mehra, P.; Desai, R.G.P.; Mascarenhas, A.A.M.Q.; Sukerkar, A.; Desa, E.S.; Navelkar, G.S.; Madhan, R.; Desa, E.; Prabhudesai, S.P.; Afzulpurkar, S.; Chakraborty, B.; Maurya, P. (Allied, India, 2003)This paper presents the preliminary results of a field experiment for low-cost strap down IMU/GPS combination for the estimation of 2-D components of vehicle position (Trajectory). In present approach the effects of earth ... -
Fine scale analyses of a coralline bank mapped using multi-beam backscatter data
Menezes, A.A.A.; Naik, M.; Fernandes, W.A.; Haris, K.; Chakraborty, B.; Estiberio, S.; Lohani, R.B. (NIOT, Chennai, 2015)In this work, we have developed a classification technique to characterize the seafloor of the Gaveshani (coralline) bank area using multi-beam backscatter data. Softcomputational techniques like the artificial neural ...