Marin Observation : From seabed to space - 12 > 16 octobre 2020
Actualités
      • Le 02/10/2020
      • L'Inde partie prenante de la Sea Tech Week® 2020

      • La France et l'Inde, et en particulier Brest et Goa, sont étroitement liées dans le domaine des sciences et technologies marines, soutenues au plus haut niveau. Depuis 2017, la communauté du Campus et l'Institut indien de technologie de Goa ont développé des relations qui s'affinent et s'affirment de plus en plus.

        Dans ce contexte, la Sea Tech Week® est heureuse d'accueillir le professeur B.K. Mishra, en tant que membre de son comité international.
      • L'Inde partie prenante de la Sea Tech Week® 2020
      • Le professeur B. K. Mishra est le directeur de l'Institut indien de technologie de Goa depuis mars 2017. Avant de rejoindre l'IIT Goa, il était professeur à l'IIT Kanpur. Le professeur Mishra a obtenu une licence en génie métallurgique à N.I.T. Rourkela, en 1981, puis un doctorat à l'université de l'Utah, en 1990. En 1993, il est retourné en Inde et a rejoint l'IIT Kanpur. Il est devenu professeur puis, en 2006, il a été nommé au CSIR par délégation de l'IIT Kanpur en tant que directeur du CSIR-IMMT, un laboratoire national situé à Bhubaneswar. 

        Il est reconnu pour sa contribution dans le domaine de la métallurgie extractive, de la technologie des poudres et de la modélisation mathématique. Il a reçu le National Geoscience Award et est membre de l'Indian National Academy of Engineering


        En outre, trois experts indiens feront une présentation orale lors de la conférence électronique :

         

        Estimating location specific water column properties from remote sensing signals via machine learning

        included in the session: Big Data, Deep Learning, Satellite Observation / Monday 12 October - 13:30-15:30 (Paris Time)

        presented by Clint Pazhayidam George, Indian Institute of Technology Goa, Farmagudi, Goa, India, India

        Additional authors:

        • Abhilasha Gupta, Indian Institute of Technology GoaFarmagudi, India
        • Guillaume Sicot, ENSTA Bretagne, Lab-STICC, Brest, France

        Keywords: Remote sensing, Data science, big data, data management

         

        Inherent Optical Properties (IOPs) such as spectral absorption and scattering (insensitive to changes in the light field) and dissolved and particulate constituents of the water column indicate its quality, biological, and biogeochemical processes. Monitoring them helps us manage inland and ocean water resources and interpret climate change effects to some extent. Measuring in situ IOPs is challenging compared to Apparent Optical Properties (AOPs) such as radiometric variables, e.g., remotely-sensed upwelling and downwelling irradiances—they depend on the medium and the geometry of the radiance distribution. Remote sensing (RS) is a viable solution for water monitoring as its wide coverage in the spatial areas at frequent intervals. Traditionally, we infer IOPs and water constituents such as suspended matter, Colored Dissolved Organic Matter, and phytoplankton by solving an appropriate forward (analytical) model that explicitly relates bio-optical relationships to radiative-transfer processes (AOPs). They can be computationally intensive, conceptually complex, and require domain expertise. People thus employed statistical or machine learning (ML) methods such as regression, neural networks, and genetic programming to this problem. Without assuming a predefined model, they directly relate the parameters of interest to RS signals by training with known samples. We study the performance of (generic) data-driven ML methods, e.g., deep learning, trained on the ground truth data from a specific region, in comparison with the traditional approaches.

        Abstract (extn): bit.ly/2BKko58

         

        Intelligent Navigation and Adaptive Controller for AUV– A Hybrid Approach with KF-CS and Deep Learning in NARMAX Model

        included in the session: Instrumentation, application to ocean observation / Wednesday 14 October - 09:00-11:00 (Paris Time)

        presented by: Neelakandan Rajamohan, Indian Institute of Technology, Goa, India

        Additional authors:

        • Bidyadhar Subudhi, Indian Institute of Technology, Goa, India
        • B N Rath, National Institute of Technology, Rourkela, Rourkela, India

        Keywords: Perception and localisation, Marine and underwater robotics, Underwater intervention and manipulation

         

        Autonomous underwater vehicle (AUV) navigation and localization in underwater environments is particularly challenging due to the rapid attenuation of Global Positioning System (GPS) and radio-frequency signals. Underwater communications are low bandwidth and unreliable, and further there is no access to a global positioning system. In order to address these challenges in AUV intelligence navigation, we propose compressed sensing based Kalman filtering (KF-CS) techniques in AUV positioning and navigation. Alongside, the deep learning (DL) has been applied to a large variety of problems in telecommunications, and the success in other domains motivates the application of DL to AUV navigation systems. Further, in this work, a constrained adaptive nonlinear model predictive control (ANMPC) is proposed for an underactuated Autonomous Underwater vehicle (AUV) without depending on the steady state knowledge of AUV. A Nonlinear Autoregressive Moving Average Exogenous (NARMAX) model is used to identify the dynamics. An optimized NARMAX model, achieved by using a Forward-Regression Orthogonal Least Square (FROLS) estimator and Error Reduction Ratio (ERR) criteria, is used to identify the heading dynamics of AUV. The key contributions are:

        1. SLAM technology with the application of Kalman filtered compressed sensing framework
        2. Intelligent navigation using deep learning incorporated with NARMAX model
        3. FROLS assisted with Kalman Filtered Compressed sensing to achieve the NARMAX for the adaptive controller design


         

        Undersea Ocean Surveillance using Submarine Cables

        included in the session: Platform, Data Management / Thursday 15 October - 13:30-15:30 (Paris Time)

        presented by: Nitin Agarwala, National Maritime Foundation, New Delhi, India

        Keywords: Underwater and coastal mapping, Remote sensing, Monitoring, security and safety

        Undersea Ocean Surveillance was an advent of Cold War, WW-II and underwater acoustics.  However, what began as a military requirement, gained scientific importance soon to support civilian scientific research (such as tracking whales and monitoring undersea volcanic activity).

        Accordingly, various passive and active systems have been developed over the years to provide continuous acoustic coverage of the vast ocean area. One system not much spoken of, but has the potential of being used for a similar activity is the ‘submarine telecommunication cable’.  These cables, a must for any country today, are laid across the oceans, providing volumes of data, and form the backbone of the telecommunication network for the globe. Studies have shown that by suitably modifying the repeaters, these cables can be used for ocean surveillance along with their primary purpose of telecommunication. 

        The paper discusses this much hidden ability of the submarine telecommunication cables to be used for undersea ocean surveillance. Though legal issues exist, for use in the deep oceans, these cables can be used for securing a countries own EEZ without any existing legal barriers by creating their own ‘Undersea Ocean Surveillance Wall’.

         

Dernières actus
Suivez nous sur Twitter

Powered by diasite
Designed by diateam