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    Wyświetlanie 1-4 z 4
    Tytuł:
    Radar observation of wind farms in various weather conditions
    Autorzy:
    Stupak, T.
    Świerczyński, S.
    Wąż, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949946.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine radars
    radar observation
    radar
    wind farms
    weather condition
    CARPET 2
    ship position
    ship position mark
    Opis:
    This article presents a calculation of condition detection wind farm by ship’s radar. The authors used computer programme CARPET 2 for simulation different propagation condition. Wind farm echoes are visible in significant distance and can be advantage to ship position mark.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 325-329
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antenna for marine radar with supperdirectivity properties
    Autorzy:
    Koshevyy, V. M.
    Shevchenko, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116049.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine radars
    supperdirectivity properties
    radar antenna
    antenna
    antenna directivity
    radar cross section (RCS)
    radar
    reception antenna diagram
    Opis:
    The reception antenna diagram side lobe’s level suppression algorithm for marine radar by means of antenna array with only a few tuning elements of antenna array is considered. The others no tuning elements of array are choosing for obtain a given value of average side lobe level suppression and with given value of antenna directivity without using of numerical optimization procedures. Special algorithm of interaction of these no tuning elements for realizing Supperdirectivity properties is used. The structural diagram of array is presented. The efficiency of suggested design has been investigated.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 317-324
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Edge element calculation of radar cross section of small maritime targets with respect to height of radar antenna
    Autorzy:
    Dodig, H.
    Vukša, S.
    Vidan, P.
    Bukljaš, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116137.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine radars
    radar cross section (CRS)
    small maritime targets
    maritime targets
    radar antenna
    height of radar antenna
    antenna height
    antenna
    Opis:
    From the aspect of navigational safety and collision avoidance it is very important to be able to detect small maritime targets such as buoys and small boats. Ship's radar is supposed to detect these types of targets, however the ability of radar to detect such targets depends on several factors. The most important factors affecting the detection probability of small maritime targets are height of the antenna installation on the ship and radar cross section of the target. The methods of computation radar cross section are diverse and complicated, however, in this paper we apply our previously published numerical method for the RCS computation which had proven to be very accurate. Physically to find RCS of the target one has to find the solution of electromagnetic scattering problem. The numerical method relies on the combination of finite edge volume elements and finite edge boundary elements to obtain the solution of Maxwell equations. The radiation pattern of ships radar antenna is the source of excitation for the numerical method. At the end of the paper the RCS of small maritime targets as the function of antenna height is shown. These results can be used as a parameter in radar design, as well as the guideline for the height of installation of the ship's radar antenna above the sea.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 331-336
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of Asymmetrical Difference Patterns from Array Antennas
    Autorzy:
    Satyanarayana, M.
    Raju, G. S. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/226481.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asymmetric patterns
    arrays
    array antennas
    marine
    radars
    amplitude distributions
    phase distributions
    Opis:
    It is common to produce sum patterns from array antennas. These patterns are basically symmetric with one main lode in bore sight and symmetric sidelobe structure around the main beam. The antennas associated with the marine radars are required to produce patterns with asymmetric side lobes. Asymmetrical patterns are very useful for marine radars when ships sail in turbulent water where roll and pitch exists.In particular the sidelobes in one side are lower than those of the other side. It is also essential to produce difference patterns with asymmetric structure from the boresight direction. These patterns are required to have null in the bore sight and high difference slope in the same direction. When these patterns are required from marine radars, the side lobes associated with the difference pattern on the either side of the boresight is at the different heights. In the present work, such useful patterns are generated from the newly designed arrays. The amplitude and phase distributions are designed for small and large arrays. The radiation patterns are numerically computed and they are presented in u- domain.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 2; 185-190
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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