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    Wyświetlanie 1-8 z 8
    Tytuł:
    The availability of Automatic Identyfication System (AIS) based on latency position reports in the Gulf of Gdansk
    Autorzy:
    Jaskólski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/320805.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    Automatic Identification System (AIS)
    stochastic processes
    availability of AIS service
    Opis:
    The problem of determining geographic position considered only in terms of measurement error, seems to be solved on a global scale. In view of the above, from the nineties, the operational characteristics of radio-navigation systems are equally important. The integrated navigation system operate in a multisensor environment and it is important to determinate a temporal validity of data to make it usable in data fusion process. In the age of digital data processing, the requirements for continuity, availability, reliability and integrity information are already grown. This article analyses the problem of time stamp discrepancies of dynamic position reports. For this purpose, the statistical summary of Latency Position Reports has been presented. The navigation data recordings were conducted during 30 days of March 2014 from 19 vessels located in area of Gulf of Gdansk. On the base of Latency Position Reports it is possible to designate the availability of AIS system.
    Problem określania pozycji geograficznej, z racji powszechnej dostępności systemów satelitarnych, w kontekście dokładności wyznaczeń wydaje się obecnie drugorzędny w skali globalnej. Od lat dziewięćdziesiątych ocena własności operacyjnych systemów radionawigacyjnych jest uważana za równie ważną. Zintegrowane systemy nawigacyjne działają w środowisku wielosensorowym i bardzo ważne staje się określenie zmienności w czasie danych nawigacyjnych, jeśli mają one podlegać fuzji. W erze cyfrowego przetwarzania danych wymagania ciągłości, dostępności, niezawodności i wiarygodności informacji wzrastają. W artykule zaprezentowano analizę problemu niezgodności znacznika czasu w odniesieniu do informacji dynamicznej w kontekście informacji o pozycji. W tym celu poddano analizie statystycznej opóźnienie informacji o pozycji. Rejestracje danych z dziewiętnastu statków były prowadzone przez trzydzieści dni marca 2014 roku na akwenie Zatoki Gdańskiej. Wykazano, że na bazie informacji o opóźnieniu raportów pozycyjnych możliwe jest wyznaczenie dostępności systemu AIS.
    Źródło:
    Annual of Navigation; 2014, 21; 59-74
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Through Capacity Model for One-way Channel Based on Characteristics of the Vessel Traffic Flow
    Autorzy:
    Nie, Y.
    Liu, K.
    Xin, X.
    Yu, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/115997.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime traffic
    vessel traffic service (VTS)
    vessel traffic flow
    one-way channel
    mathematical model
    Automatic Identification System (AIS)
    Opis:
    Vessel traffic flow is a key parameter for channel-through capacity and is of great significance to vessel traffic management, channel and port design and navigational risk evaluation. Based on the study of parameters of characteristics of vessel traffic flow related to channel-through capacity, this paper puts forward a brand-new mathematical model for one-way channel-through capacity in which parameters of channel length, vessel arrival rate and velocity difference in different vessels are involved and a theoretical calculating mechanism for the channel-through capacity is provided. In order to verify availability and reliability of the model, extensive simulation studies have been carried out and based on the historical AIS data, an analytical case study on the Xiazhimen Channel validating the proposed model is presented. Both simulation studies and the case study show that the proposed model is valid and all relative parameters can be readjusted and optimized to further improve the channel-through capacity. Thus, all studies demonstrate that the model is valuable for channel design and vessel management.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 495-502
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AIS-Assisted Service Provision and Crowdsourcing of Marine Meteorological Information
    Autorzy:
    Chang, J. S.
    Huang, C. H.
    Chang, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116576.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    crowdsourcing
    meteorology
    marine meteorological information
    AIS-assisted service
    Automatic Identification System (AIS)
    typhoon forecast
    Application-Specific Messages (ASM)
    AIS-Weather project
    Opis:
    Ship navigation and operational activities at sea need meteorological and hydrographic information to enhance safety and efficiency. Besides observations collected from deployed data buoys, marine meteorological information services rely on weather observation reports from ships to increase the data density and thus service quality. Automatic Identification System (AIS), adopted internationally to facilitate ship-ship and ship-shore data exchange, has developed into communication links between ship/shore and buoys with many potential applications. This paper presents AIS applications designed and implemented for marine meteorological information services in a long-term project initiated by the Central Weather Bureau of Taiwan. Achievements of this initiative include: versatile service delivery via shore-based AIS network to shipborne application platforms such as smart phones, remote controllable moving weather data collection, and assisted sharing of weather observation reports from ships. Typhoon forecast and warning is one of the key applications implemented for this region.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 63-67
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Automatic Identification System on Safety of Navigation at Sea
    Autorzy:
    Stupak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/117256.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine navigation
    Automatic Identification System (AIS)
    safety at sea
    Safety of Navigation
    Gulf of Gdansk
    vessel traffic service (VTS)
    Radar Target
    Radar Tracking
    Opis:
    Detection of small crafts/targets, in particular, sailing yachts with the ship's radar is not always possible. Radar reflectors are used to improve their detection. The AIS (Automatic Identification System) transmits position, motion vector and identification signals of a vessel to other ships and VTS (Vessel Traffic Services) centers . This system significantly increases the possibility to detect small crafts. The paper presents results of comparative study of using information from the Automatic Identification System and from radar to determine the accuracy of tracking the position and motion vector of ships in the Gulf of Gdansk. Possibilities and limitations of the AIS are also presented.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 337-341
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AIS based shipping routes using the dijkstra algorithm
    Autorzy:
    Silveira, P.
    Teixeira, A. P.
    Guedes-Soares, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116029.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Dijkstra’s Algorithm
    AIS Data
    Automatic Identification System (AIS)
    AIS based shipping routes
    shipping routes
    Vessel Traffic Service (VTS)
    port of Setubal
    Ro-Ro Terminal
    Opis:
    This paper proposes an approach for identifying and characterizing shipping routes using information contained in Automatic Identification System messages broadcasted by ships and recorded by the coastal Vessel Traffic Service centre. The approach consists of using historical Automatic Identification System data to build a graph, where nodes are cells of a grid covering the geographical area being studied and the weights of directional edges are inversely related to ship movements between cells. Based on this graph, the Dijkstra algorithm is used to identify a potential safe route, assumed to be the most used route by ships between two locations. A second graph is created simultaneously, with the same nodes and edges, but with edge weights equal to the average speed of transitions between cells, thus allowing the determination of the average speed profile for any possible path within the graph. The proposed approach is applied to two scenarios: an approach to the port of Lisbon and the entry through the fairway to a RO-RO terminal in the port of Setubal in Portugal.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 565-571
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying and Analyzing Safety Critical Maneuvers from High Resolution AIS Data
    Autorzy:
    Mestl, T.
    Tallakstad, K.T.
    Castberg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/117375.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    AIS Data
    Automatic Identification System (AIS)
    High Resolution AIS Data
    Critical Maneuvers
    1-2-3 Rule
    vessel traffic service (VTS)
    AIS Transponder
    Safety of Navigation
    Opis:
    We demonstrate the value in previously disregarded parameters in AIS data, and present a novel way of quickly identifying and characterizing potentially safety critical situations for vessels with a properly configured AIS transponder. The traditional approach of studying (near) collision situations, is through vessel conflict zones, based on vessel location and speed from low resolution AIS data. Our approach utilizes the rate of turn parameter in the AIS signal, at maximum time resolution. From collision investigation reports it is often seen that prior to or at collision navigators perform frenetic rudder actions in the hope to avoid collision in the last second. These hard maneuverings are easily spotted as non-normal rate of turn signals. An identified potential critical situation may then be further characterized by the occurring centripetal acceleration a vessel is exposed to. We demonstrate the novelty of our methodology in a case study of a real ship collision. As the rate of turn parameter is directly linkable to the navigator behavior it provides information about when and to what degree actions were taken. We believe our work will therefore inspire new research on safety and human factors as a risk profiles could be derived based on AIS data.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 1; 69-77
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method foranalyzing AIS data and determination of simultaneously ships passage via strait of split
    Autorzy:
    Bukljaš, M.
    Vukša, S.
    Pavić, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/116084.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Automatic Identification System (AIS)
    AIS Data
    strait of split
    ships passage
    AIS Decoder
    simultaneous ship passage
    Vessel Traffic Service (VTS)
    International Waterway Risk Assessment Program (IWRAP)
    Opis:
    The traffic density is a basic characteristic of marine traffic for some navigational area. In the case of narrow channels such as Strait of Split (Splitska vrata), apart from the traffic density, the number of simultaneous ship passages is also important as well as ships characteristics. Based on such data, additional navigational safety guidelines and regulations may be planned for the observed area. The purpose of this research is to determine the number of simultaneous ship passages via Strait of Split for a certain period of time. Collected AIS data in SPNMEA format was decoded by AIS Decoder online program to csv file. For five randomly selected days in the summer period, based on AIS data, the number of simultaneous ship passages was determined and ships information presented.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 679-684
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary inter-comparison of AIS Data and optimal ship tracks
    Autorzy:
    Mannarini, G.
    Carelli, L.
    Zissis, D.
    Spiliopoulos, G.
    Chatzikokolakis, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/116108.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    AIS Data
    ship track
    Copernicus Marine Environment Monitoring Service (CMEMS)
    Automatic Identification System (AIS)
    VISIR (discoVerIng Safe and effIcient Routes)
    VISIR track
    VISIR model
    optimal ship track
    Opis:
    Optimal ship tracks computed via the VISIR model are compared to tracks recorded by the Automatic Identification System (AIS). The evaluation regards 43 tracks in the Southern Atlantic Ocean, sailed during 2016-2017 by different bulk carriers. In this exercise, VISIR is fed by wave analysis fields from the Copernicus Marine Environment Monitoring Service (CMEMS). In order to reproduce vessel speed loss in waves, a new methodology is developed, where kinematic information from AIS is fusioned with wave information from CMEMS. Resulting VISIR tracks are analyzed along with AIS tracks in terms of their topological features and duration. The tracks exhibit quite diverse topological shapes, including orthodromic, loxodromic, and other paths with complex and dynamic diversions. The distribution of AIS to VISIR track durations is analyzed in terms of several parameters, such as the AIS to VISIR track length and their Fréchet distance. Model features of VISIR affecting the results are discussed and future developments suggested by the results are outlined.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 53-61
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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