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    Wyświetlanie 1-8 z 8
    Tytuł:
    Reconstruction of geomagnetic event as observed in Northern Adriatic region and Its correlation with GPS single-frequency positioning deviations
    Autorzy:
    Brčić, D.
    Ćelić, J.
    Valčić, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116009.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    geomagnetic event
    Northern Adriatic
    Global Positioning System (GPS)
    positioning deviations
    positioning
    Navigation and Timing (PNT)
    Total Electron Content (TEC)
    Classification and Regression Trees (CART)
    Opis:
    Space weather effects are generally recognized as causes of degradation of satellite positioning, navigation and timing (PNT) services. We analyze GPS position estimation error during a geomagnetic storm, focusing on manifestations of geomagnetic processes. The position estimation error was analyzed in terms of GPS coordinates’ deviations (latitude, longitude and height) from their reference values. The storm’s impact was studied in the Northern Adriatic region where GPS observables from two Global Navigation Satellite System (GNSS) reference stations were analysed. Geomagnetic indices were elaborated, comprising readings from interplanetary, magnetospheric and geomagnetic observatories. Total Electron Content (TEC) on both stations was computed using dual frequency GPS pseudorange observables. The experiment was to reconstruct the movement of geomagnetic disturbances entering the geospace, reaching the earth’s surface. The aim was to correlate possible space weather manifestation on satellite positioning performance in terms of positioning error. Regularities in changes in positioning deviations were identified with relation to influential indices. The research offered a possibility of experimental positioning deviations assessment as well as forecasting. Evaluation of generated rudimentary Classification and Regression Trees (CART) models showed that the risk of satellite positioning errors could be assessed and predicted considering absolutes, as well as changes in values of geomagnetic indices. During the research process, several activities emerged as preferable continuation of the work, with the aim of further development of predictive models and the complement of space weather scenarios and their consequences on navigational systems. Along with summarized results, they are outlined in the conclusion section.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 349-357
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of tropospheric contribution to GPS positioning error during tropospheric cyclone Marcus in 2018
    Autorzy:
    Sikirica, N.
    Horvat, M.
    Špoljar, D.
    Rumora, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/116217.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Global Positioning System (GPS)
    cyclone Marcus
    positioning
    Navigation and Timing (PNT)
    Port Darwin
    NASA Earth Observatory
    tropospheric correction
    Software-Defined Radio (SDR)
    Opis:
    GNSS positioning performance assessment is essential for sustainable development of a growing number of GNSS-based technology and socio-economic applications. Case-studies of GNSS positioning performance in critical environments and applications scenarios reveals vulnerabilities of the GNSS Positioning, Navigation, and Timing (PNT) services, and suggest mitigation techniques and GNSS application risk containment. Here we address the case of GPS positioning performance during a devastating tropical cyclone Marcus that hit the greater area of the city of Darwin, Australia in 2018. We identified specific statistical properties of time series of tropospheric contribution to GPS northing, easting, and vertical positioning error that may contribute to understanding of tropospheric effects on GPS positioning performance during a massive weather deterioration in maritime and coastal areas, and analysed their adversarial effects on GNSS-based maritime applications.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 343-348
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Architecture of positioning and tracking solutions for maritime applications
    Autorzy:
    Ilcev, S.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2211830.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ships tracking
    Global Navigation Satellite System
    satellite asset tracking
    radio frequency
    satellite transponder
    tracking
    positioning
    global ship tracking
    Opis:
    This paper discusses the current and new satellite transponders for global tracking and detecting of oceangoing ships, assets, crew, passengers and any moving objects at sea for enhanced vessels traffic control and management. These transponders are able to monitor all maritime assets and to improve safety, security of movements and collision avoidance, especially during very bad weather conditions and visibility. By deployment of the Global Navigation Satellite System (GNSS) in integration with Inmarsat, Iridium and other satellite systems in one unit with antenna, it is possible to provide reliable positioning and tracking solutions for civilian maritime, other mobiles and personnel at different Radio Frequency (RF) bands. The existing and forthcoming space and ground segment for positioning and tracking solutions as a modern Satellite Asset Tracking (SAT) onboard ships, and other relating systems are discussed and benefits of these new technologies and solution for improved positioning and tracking are explored.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 3; 481--489
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GNSS positioning error change-point detection in GNSS Positioning Performance Modelling
    Autorzy:
    Filić, M.
    Filjar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/117469.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    positioning
    Navigation and Timing (PNT)
    GNSS Positioning Performance Modelling
    GNSS Positioning Error Change-point Detection
    GNSS Positioning Performance
    GNSS Resilience
    GNSS Utilisation Risk Mitigation
    GNSS Positioning Performance Degradation
    Opis:
    Provision of uninterrupted and robust Positioning, Navigation, and Timing (PNT) services is essential task of Global Navigation Satellite Systems (GNSS) as an enabling technology for numerous technology and socio-economic applications, a cornerstone of the modern civilisation, a public goods, and an essential component of a national infrastructure. GNSS resilience may be accomplished only with complete understanding of the causes of GNSS positioning performance disruptions and degradations, presented in a form of applications- and scenarios-related models. Here the application of change-point detection methods is proposed and demonstrated in a selected scenario of a fast-developing ionospheric storm’s impact on GNSS positioning performance, as a novel contribution to forecasting GNSS positioning performance model development and GNSS utilisation risk mitigation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 575-579
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Architektura MDGNSS : Przenośny Różnicowy Globalny Nawigacyjny System Satelitarny
    Architecture of MDGNSS : Mobile Differential Global Navigation Satellite System
    Autorzy:
    Dobryakova, L.
    Ochin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/317068.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    pozycjonowanie
    dokładność pozycjonowania
    nawigacja
    GNSS
    MDNSS
    nawigacyjny system satelitarny
    transport bezzałogowy
    bezpieczeństwo transportu
    Global Navigation Satellite System
    positioning
    positioning accuracy
    navigation
    MDNS
    unmanned transport
    transport safety
    Opis:
    Pozycjonowanie GNSS i nawigacja mają znaczny wpływ na życie codzienne. Jednym z głównych problemów nawigacji współczesnej, zarówno systemów transportowych załogowych, jak i bezzałogowych jest problem bezpieczeństwa transportu. W celu zwiększania dokładności pozycjonowania transportu wykorzystuje się technologię DGNSS – Różnicowy GNSS, która opiera się na instalacji nieruchomej stacji bazowej przy użyciu znanej pozycji XY z dokładnością geodezyjną. W artykule tym rozpatrywane są zasady architektury MDGNSS – Przenośnego DGNSS, w którym stacja bazowa wykorzystuje konwencjonalny przenośny komputer, obliczający dokładną lokalizację XY poprzez analizę statystyczną wyników jej pozycjonowania w ciągu kilkudziesięciu minut.
    System The GNSS positioning and navigation have a significant impact on daily life. One of the main problems of modern navigation both manned and unmanned transport systems is a problem of transport safety. To improve the accuracy of positioning of transport used DGNSS technology – Differential GNSS, which is based on setting a fixed base station with a known geodetic position XY. In this article we consider the principles of MDGNSS architecture – Mobile Differential GNSS, in which a base station uses a conventional laptop, defining your location XY accurately, through statistical analysis of its positioning results for several tens of minutes.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 135-141
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of flying objects position
    Autorzy:
    Dzunda, M.
    Dzurovcin, P.
    Melniková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116434.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Electronic Chart Systems
    flying objects (FO)
    flying objects position
    Matlab
    non-flying objects
    positioning
    Global Navigation Satellite System (GNSS)
    dilution of precision (DOP)
    Opis:
    This paper describes various methods of flying object positioning with the emphasis on their accuracy. Based on the accomplished analysis, we will select the most appropriate method to determine the position of a flying object for relative navigation purposes. The primary criterion for choosing a positioning method is the accuracy of distance measurement within users working in the aviation communications network. The results presented in the paper have been based on mathematical modelling and computer simulation performed in the Matlab programming environment. The results obtained can be used to navigate flying or non-flying objects that work in the air communications network.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 423-428
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foundations of GNSS spoofing detection and mitigation with distributed GNSS SDR receiver
    Autorzy:
    Filić, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117522.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    positioning
    Navigation and Timing (PNT)
    cyber attack
    Spoofing Detection and Mitigation (SDM)
    GNSS SDM
    spoofing
    GNSS receiver
    GNSS spoofing attack
    Opis:
    GNSS spoofing is an intentional and malicious action aimed at degrading and suppressing GNSS Positioning, Navigation, and Timing (PNT) services. Since it affects data and information segment of GNSS, it is considered a GNSS information (cyber‐) security attack. Considering a significant and powerful threat, GNSS spoofing should be treated seriously to avoid damage and liabilities resulting from disruptions of GNSS PNT services. Here the GNSS position estimation procedure is examined for potential vulnerabilities, and the nature of and motivation for GNSS spoofing attacks exloiting the vulnerabilities assessed. A novel GNSS Spoofing Detection and Mitigation (GNSS SDM) method is proposed within the established computational and communication infrastructure, that allows for successful overcoming and classification of GNSS spoofing attacks. Proposed method is applicable without requirements for core GNSS modification, and leaves majority of user equipment easily transferable to the GNSS spoofing‐free environment. Potential GNSS spoofing effects and GNSS anti‐spoofing opportunities in maritime sector were given a particular attention.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 649-656
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The concept of time in navigation
    Autorzy:
    Weintrit, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116645.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    time
    marine navigation
    positioning
    Navigation and Timing (PNT)
    Greenwich Mean Time (GMT)
    Universal Time Coordinated (UTC)
    International Atomic Time TAI
    Global Navigation Satellite System
    history of navigation
    Opis:
    The article discusses the concept of time in navigation, especially in marine navigation, as well as selected time measures, among others: Greenwich Mean Time (GMT), Universal Time Coordinated (UTC), International Atomic Time TAI (Temps Atomique International), GPST (Global Positioning System Time) eLoran Time and interrelation between these measures. Understanding how time is involved in navigation, and using it, is one of the navigator's most important duties. Nowadays we have satellite navigation to help us know where we are. These satellites contain several very precise and accurate clocks, because time and location are completely and totally inter-related in satellite navigation. There is growing interest internationally concerning the vulnerability Global Navigation Satellite Systems (GNSS) to natural and man-made interference, plus the jamming and spoofing of their transmissions. These vulnerabilities have led to a demand for sources of resilient PNT (Positioning, Navigation and Timing) [16], including a robust means of distributing precise time nationally and internationally.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 2; 209-219
    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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