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    Wyświetlanie 1-4 z 4
    Tytuł:
    3D imaging of seabed from electronic chart bathymetric data
    Autorzy:
    Demkowicz, J.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331740.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Application of 3D imaging and mapping of seabed is very attractive in many areas including marine cartography, navigation. hydrography, GIS systems etc. There are two competing approaches to constructing 3D images of seabed. The first, off-line method, utilizes the bathymetric information extracted from vectorized digital navigational charts. The second one, on-line technique, employs multibeam sonar seabed echo records processing, The paper describes procedures of bathymetric data analysis for the first method along with newly proposed rendering schemes.
    Źródło:
    Hydroacoustics; 2001, 4; 37-42
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integration of inertial sensors and GPS system data for underwater navigation
    Autorzy:
    Bikonis, K.
    Demkowicz, J.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332423.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The Inertial Navigation System (INS) is usually employed to determine the position of an underwater vehicles, like Remotely Operated Vehicles (ROV) and, more recently, Autonomous Underwater Vehicle (AUV). The accuracy of the position provided by the INS, which uses accelerometers and gyroscopes, deteriorates with time. An external aiding sources such as the Global Positioning System (GPS) can be employed to reduce the error growth in the INS. The GPS aided INS system provides enhance positioning accuracy of the underwater vehicles compared to that of a stand-alone INS technique. In the paper integration algorithm of inertial sensors (accelerometers and gyroscopes) and GPS system data for underwater navigation is presented. For data integration algorithm External Kalman Filter (EKF) is proposed.
    Źródło:
    Hydroacoustics; 2012, 15; 21-26
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel approach to bottom scattering using a narrow acoustic beam
    Autorzy:
    Zieliński, A.
    Tegowski, J.
    Lubniewski, Z.
    Demkowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332113.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The acoustic response of the ocean bottom to a probing pulse is a complex and complicated process. This process is influenced by with the form of an acoustic transmitting/receiving beam and by the physical processes involved in sound scattering from the surface and the volume of the ocean bottom. The complexities of these phenomena often obscure an intuitive understanding of the underlying principles of echo formation and its reception. In this paper, we propose a simplistic model for this complex process using filter theory. The bottom is represented as a surface reflector with an acoustic wave front sweeping over it with time-varying velocity. The impulse response of a smooth flat bottom is characteristic of a low pass-filter that will greatly attenuate the impinging high frequency pulse. On the other hand, bottom undulations will modulate the reflected signal such that it can be represented by the impulse response of a band-pass filter. The received echo can be represented as the response of such filter to a high frequency pulse. The characteristics and amplitude of the echo are dependent on frequency spectrum overlap between the transmitted pulse spectrum and the filter frequency response. In the paper, we discuss several cases of interest with the intent to provide a solid intuitive understanding of the echo formation from the system point of view.
    Źródło:
    Hydroacoustics; 2004, 7; 253-258
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D visualisation and monitoring of marine pollutant aggregations in web-based GIS
    Autorzy:
    Łubiniewski, Z.
    Bikonis, K.
    Demkowicz, J.
    Partyka, A.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332356.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the visualisation and monitoring of marine pollutant aggregations as the sample application of the real-time, remotely accessible marine GIS. The system is dedicated for instantaneous integration, processing and visualisation of marine data acquired by direct sampling, satellite remote sensing and underwater acoustic systems. The developed Web-based GIS is capable of producing 2D maps with overlaid various types of data, as well as generating the composed, time-varying 3D scenes presenting different elements of marine environment. As the sample application of the system, the visualisation of the 3D modelling of an oil spill drift and spreading within the southern Baltic area is presented. The data were obtained from the composed 3D modelling system CAROCS. The developed GIS, due to its remote accessibility and the on-line data processing, may be applied as a useful tool for maritime domain awareness and emergency management supporting, with respect to hazard of a different kind: pollution, ecological catastrophes, natural disasters. The system utilises the SQL spatial database for data storage and the Scalable Vector Graphics (SVG) and Virtual Reality Modelling Language (VRML) standards for remote presentation of geographical objects, and requires only the WWW browser with SVG and VRML viewer on the client side.
    Źródło:
    Hydroacoustics; 2006, 9; 103-108
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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