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    Wyświetlanie 1-9 z 9
    Tytuł:
    Genetic algorithm for solving celestial navigation fix problems
    Autorzy:
    Tsou, Ming-Cheng
    Powiązania:
    https://bibliotekanauki.pl/articles/963415.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    genetic algorithm
    celestial navigation
    intercept method
    celestial fix
    Opis:
    As we enter the 21st century and advance further into the information age, traditional methods for computing a celestial navigation fix can no longer meet the requirements of modern vessels in terms of calculation speed and precision. Study of precise, rapid, and convenient celestial navigation computational methods and the application of information technology to modern celestial navigation is especially meaningful, considering the current push for e-Navigation. In this work, we employ a genetic algorithm, from the field of artificial intelligence, due to its superior search ability that mimics the natural process of biological evolution. Unique encodings and genetic operators designed in this study, in combination with the fix principle of celestial circles of equal altitude in celestial navigation, allow the rapid and direct attainment of accurate optimum vessel position. Test results indicate that this method has more flexibility, and avoids tedious and complicated computation and graphical procedures.
    Źródło:
    Polish Maritime Research; 2012, 3; 53-59
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Celestial navigation fix based on particle swarm optimization
    Autorzy:
    Tsou, M.-C.
    Powiązania:
    https://bibliotekanauki.pl/articles/258524.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    particle swarm optimization (PSO)
    Celestial navigation
    Intercept method
    Opis:
    A technique for solving celestial fix problems is proposed in this study. This method is based on Particle Swarm Optimization from the field of swarm intelligence, utilizing its superior optimization and searching abilities to obtain the most probable astronomical vessel position. In addition to being applicable to two-body fix, multi-body fix, and high-altitude observation problems, it is also less reliant on the initial dead reckoning position. Moreover, by introducing spatial data processing and display functions in a Geographical Information System, calculation results and chart work used in Circle of Position graphical positioning can both be integrated. As a result, in addition to avoiding tedious and complicated computational and graphical procedures, this work has more flexibility and is more robust when compared to other analytical approaches.
    Źródło:
    Polish Maritime Research; 2015, 3; 20-27
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New computational approaches to determining the astronomical vessel position based on the Sumner line
    Autorzy:
    Chen, C. L.
    Hsu, T. P.
    Weng, G. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/258908.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    celestial navigation
    astronomical vessel position
    Sumner line
    iteration scheme
    Opis:
    In this paper two new approaches are developed to calculate the astronomical vessel position (AVP). Basically, determining the AVP is originated from the spherical equal altitude circles (EACs) concept; therefore, based on the Sumner line’s idea, which implies the trial-and-error procedure in assumption, the AVP is determined by using the two proposed approaches. One consists in taking the great circle of spherical geometry to replace the EAC to fix the AVP and the other implements the straight line of the plane geometry to replace the EAC to yield the AVP. To ensure the real AVP, both approaches choose the iteration scheme running in the assumed latitude interval to determine the final AVP. Several benchmark examples are demonstrated to show that the proposed approaches are more accurate and universal as compared with those conventional approaches used in the maritime education or practical operations.
    Źródło:
    Polish Maritime Research; 2014, 4; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Teaching Celestial Navigation in the Age of GNSS
    Autorzy:
    Ibáñez, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/117421.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    celestial navigation
    age of GNSS
    astronavigation
    teaching celestial navigation
    Maritime Education and Training (MET)
    MET System in Spain
    STCW
    Global Navigation Satellite Systems (GNSS)
    Opis:
    Over the past two decades, we have witnessed the astounding development of Global Navigation Satellite Systems (GNSS). Celestial navigation has gradually been declining, displaced by the availability of these new, accurate, and easy-to-use electronic systems. Nonetheless, according to the International Convention on Standards of Training, Certification and Watchkeeping (STCW), deck officers onboard merchant ships must have been trained in the observance of celestial bodies to plot the ship’s position and to calibrate compass error. It is a real challenge in the current context to which lecturers in nautical astronomy can respond through innovation in their teaching methods. A new approach to training students in celestial navigation at the Nautical College of the University of the Basque Country is discussed in this paper. It has already achieved promising results in comparison with the traditional teaching methodology, and is both efficient and effective. The adoption of institutional measures is also proposed to ensure that the competence acquired in the training phase is at all times present throughout professional practice.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 573-584
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MAAPCNIA: A Boost to Authentic MET Instruction
    Autorzy:
    Baylon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116722.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Astronavigation
    Maritime Education and Training (MET)
    MET Instruction
    Teaching Strategy
    Celestial Navigation
    Celestial Sphere
    Celestial Fixing
    Opis:
    This paper presents an innovation in teaching strategy in one major subject in the Maritime Education and Training (MET) program of the Maritime Academy of Asia and the Pacific (MAAP). This strategy makes use of an instructional aid called MAAPCNIA (MAAP Celestial Navigation Instructional Aid), conceptualized and designed by Capt. Daniel S. Torres, Jr. MAAPCNIA encompasses color-coded spheres that depict navigational triangle. This triangle is composed of a blue celestial sphere representing horizon system of coordinates and a white sphere enclosing a globe characterizing time diagram and celestial equator and terrestrial systems of coordinates. With this instrument, celestial spheres can be easily visualized compared when using one-dimensional drawing. Hence, understanding of orthographic projection, which is essentially the core of appreciation and mastery of this tough subject, is enhanced. This paper focuses on the development and impact of MAAPCNIA since its conception in 2004, towards authentic teaching-learning process in Celestial Navigation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 285-290
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of Altitude Accuracy of Punctual Celestial Bodies Measured with Help of Digital Still Camera
    Autorzy:
    Bobkiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/116884.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Astronavigation
    Altitude Accuracy
    Celestial Navigation
    Digital Still Camera
    Sextant
    Calibration
    Celestial Bodies
    Accuracy of Position
    Opis:
    Measurement of altitude traditionally made with sextant may be done with help of digital still camera. Factors influencing accuracy of this measurement done with help of such a device are described in the paper. Values of errors introduced by each of these factors are estimated basing on example technical data of typical digital camera. This analysis shows, which factors are the most important and if accuracy of altitude is sufficient for purposes of celestial navigation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 279-284
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Method Of Sight Reduction
    Autorzy:
    Buslă, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841519.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    astronavigation
    celestial navigation
    intercept method
    astronomical position lines
    fix position
    geographical coordinate
    sight reduction
    Opis:
    As ships and maritime transport have evolved, knowledge of navigation methods has also evolved, reaching today modern means that require less of the skills and time of navigators to determine the position of the ship on sees and oceans. However, the IMO resolutions maintain the obligation for seafarers to know the procedure for deter-mining the position of the ship based on the use of astronomical position lines, a process known simply as the "Intercept Method". As is well known, the classical "Intercept Method" involves a graphical stage aimed to determine the geographical coordinate of Fix position. This paper presents a combined method which eliminates the graphical construction which may involve plotting errors. The method introduces mathematical computation of fix geographical coordinates.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 2; 389-393
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fix Position Using Two Astronomical Line Of Position
    Autorzy:
    Buslă, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841518.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    astronavigation
    celestial navigation
    intercept azimuth method
    Marq de Saint Hilaire
    International Maritime Organization
    STCW
    astronomical line of position
    Opis:
    The Intercept Method (originally known as the Intercept Azimuth method) was created in 1875 by the French captain (latter admiral) Marq de Saint Hilaire. The method is still used today and is accepted by the International Maritime Organization as an component element of the Standards of Training, Certification and Watch-keeping for Seafarers. This paper aims to present the way of graphically determination of the vessel's fix position with two astronomical position lines computed using the intercept method.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 2; 395-398
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some New Dimensions in Sextant-Based Celestial Navigation Aspects of Position Solution Reliability with Multiple Sights
    Autorzy:
    Zevering, K. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/116559.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Astronavigation
    Sextant
    Celestial Navigation
    Multiple Sights
    Position Fixing
    Sight Reduction Tables
    least squares method (LSQ)
    Running Fix Technique (RFT)
    Opis:
    The traditional approach relying on sight reduction tables, a non-programmatic location of the position fix and an inadequate allowance for observation errors is still widely pursued and advocated. In the late 1970s the programmatic Least Squares method (LSQ) was introduced which determines a random error fix (FixQ) for any multiple sights combination. B.D Yallop & C.Y Hohenkerk (1985) expanded LSQ to incorporate the computation of the random error margin of a fix. Several marketed PDA-based programs apply LSQ, but none have fully incorporated the random error margin as a guide for the navigator. All existing LSQ applications have two drawbacks. One is, all observation error is attributed to random sources, whereas the possibility of systematic error has in fact a long theoretical and practical background in celestial navigation. Systematic error represents a bias in statistical random error theory and can and should be allowed for. A major drawback is that existing LSQ program applications incorporate the running fix technique (RFT) traditionally applied in coastal navigation. It has no general validity in celestial navigation. The position circle of an earlier celestial sight can only be mathematically correctly transferred when its Geometric Position (GP) is transferred for the run data. A final aspect of reliability is the strategy adopted at the sight planning stage. At least during twilight observations, navigators should aim at getting three or four sights with a total azimuth angle >180o, with three successive subsights on each body. In such configurations FixQ and FixS will be relatively close together, generally obviating the need to process the sights for possible systematic error.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 271-278
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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