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    Wyświetlanie 1-8 z 8
    Tytuł:
    Satellite navigation systems applications, the main utilization limits for maritime users
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/360752.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    satellite navigation
    positioning systems
    ship’s position
    maritime users
    limits
    Opis:
    Nowadays (October 2013) information about ship’s position is obtained generally from specialized electronic positioning systems, in particular, at present functionally satellite navigation systems (SNS) as GPS and GLONASS, and satellite based augmentation systems (SBAS) as EGNOS, WAAS and MSAS. Two next SNS, Galileo and BeiDou, and two next SBAS, GAGAN and SDCM, are under construction. After all the user of these systems, the maritime user also, continually meets and will meet with numerous different limitations of SNS coverage in restricted area, SBAS and DGPS reference stations coverage area, the lack of integrity information about the systems, and of many charts referred to WGS–84 datum, with problem of position fix in restricted area, etc.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 70-75
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An assessment of the character and usefulness of the information available on the internet about state-owned satellite navigation and satellite-based augmentation systems
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/135444.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    satellite navigation system
    satellite based augmentation system (SBAS)
    internet
    availability
    character of information
    usefulness of information
    Opis:
    To date, a ship’s position can generally be obtained from functional satellite navigation systems (SNS), such as Global Position Systems (GPS and GLONASS), and Satellite-Based Augmentation Systems (SBAS), such as (European Geostationary Navigation Overlay Service (EGNOS), GPS-Aided Geo Augmented Navigation system (GAGAN), MTSAT Satellite Augmentation System (MSAS) and Wide Area Augmentation System (WAAS). Sometimes these systems are collectively called Global Navigation Satellite Systems (GNSS). Two more SNS, Galileo and BeiDou, one more SBAS, System for Differential Corrections and Monitoring (SDCM), and new regional systems, such as Quasi-Zenith Satellite System (QZSS) in Japan and Indian Regional Navigation Satellite System (IRNSS) in India, are also under construction. Information about all of these 11 systems is available on the internet. The number of links and the type of the information obtained from two search engines, Google and Bing, for the different keywords concerning each system are shown in the paper. Additionally, the analysis of the character and usefulness of the information placed on the pages of governmental organizations and institutions administering the above-mentioned systems, manufacturers of the satellites, receivers and different kinds of the institutional users is also provided.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 123-127
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relevance of the relativistic effects in satellite navigation
    Autorzy:
    Kulbiej, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/135096.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    GPS
    Galileo
    GLONASS
    BeiDou
    COMPASS
    IRNSS
    satellite navigation
    GNSS
    relativistic effects
    accuracy
    clock offset
    relativistic error
    Opis:
    Position determination of Global Navigation Satellite Systems (GNSS) depends on the stability and accuracy of the measured time. However, since satellite vehicles (SVs) travel at velocities significantly larger than the receivers and, more importantly, the electromagnetic impulses propagate through changing gravitational potentials, enormous errors stemming from relativity-based clock offsets would cause a position error of about 11 km to be accumulated after one day. Based on the premise of the constancy of light, two major relativistic effects are described: time dilation and gravitational-frequency shift. Following the individual interests of the author, formulas of both are scrupulously derived from general- and special-relativity theory principles; moreover, in the penultimate section, the equations are used to calculate the author’s own numerical values of the studied parameters for various GNSSs and one Land Navigation Satellite System (LNSS).
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 85-90
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of a novel Receiver Autonomous Integrity Monitoring procedure consistent with IMO requirements
    Autorzy:
    Mink, M.
    Heck, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/134914.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Global Navigation Satellite Systems
    integrity
    Receiver Autonomous Integrity Monitoring
    maritime
    International Maritime Organization
    protection level
    Opis:
    Although integrity concepts for Global Navigation Satellite Systems (GNSS) are ubiquitous in the aviation community, integrity algorithms of comparable maturity have not yet been developed for maritime users. The International Maritime Organization (IMO) specifies requirements different from those specified by the International Civil Aviation Organization (ICAO). These different requirements affect the design of the integrity algorithms with respect to integrity risk allocation and threat space. This paper describes a novel integrity algorithm based on conditions valid for maritime users. The performance of the novel integrity algorithm has been assessed and compared to a conventional Receiver Autonomous Integrity Monitoring (RAIM) approach consistent with IMO requirements.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 155-161
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of positioning methods using Global Navigation Satellite Systems (GNSS) in Polish State Railways (PKP)
    Autorzy:
    Specht, Mariusz
    Szmagliński, Jacek
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Czaplewski, Krzysztof
    Karwowski, Krzysztof
    Dąbrowski, Paweł S.
    Chrostowski, Piotr
    Grulkowski, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/906101.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    rail transport
    global navigation satellite system (GNSS)
    satellite receiver
    European Train Control System (ETCS)
    train positioning system
    Polish State Railways (PKP)
    Opis:
    Each year, global navigation satellite systems (GNSS) improve their accuracy, availability, continuity, integrity, and reliability. Due to these continual improvements, the systems are increasingly used in various modes of transport, including rail transport, the subject of this publication. GNSS are used for rail passenger information, rail traffic management, and rail traffic control. These applications differ in the positioning requirements that satellite navigation systems must meet. This article presents the methods and systems of rolling stock location and tracking using the Polish State Railways (PKP) as an example. The information on the equipment used for train positioning is not specified anywhere, hence they may differ, even for the same multiple units travelling in different parts of the country. In addition, the publication presents the progress of the European Train Control System (ETCS) implementation by the PKP.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 26-35
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    R-Mode receiver development for medium frequency signals
    Autorzy:
    Grundhöfer, L.
    Gewies, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/134934.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Global Navigation Satellite Systems
    GNSS
    GPS
    R-mode technology
    R-mode receiver
    LORAN-C
    maritime radio beacons
    Opis:
    Signals from Global Navigation Satellite Systems are the primary source for Position, Navigation and Time (PNT) information onboard any vessel today. As these signals are prone to interference, a maritime backup system is needed to provide reliable PNT data, R(anging)-Mode is such a system. It utilizes existing maritime radio beacons or base stations of the Automatic Identification System (AIS) by adding ranging components to the legacy signals. The first modified radio beacons transmit medium frequency (MF) R-Mode signals in northern Germany. This paper has described the current state of the authors’ research and development activities at the receiver level for MF R-Mode signals. The receiver platform has been introduced, which was based on off-theshelf components and the implemented algorithms for distance estimation have been explained. Furthermore, the results of the first ranging measurements have been presented, which have shown the general suitability of the R-Mode technology as a source for maritime positioning and timing data.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 57-62
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GPS/GNSS spoofing and the real-time single-antenna-based spoofing detection system
    Autorzy:
    Ochin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/135406.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Global Navigation Satellite System
    Global Positioning System
    anti-terrorism
    anti-spoofing
    transport safety
    spoofer
    spoofing detection algorithm
    Opis:
    The idea of C/A codes GPS/GNSS Spoofing (Substitution), or the ability to mislead a satellite navigation receiver into establishing a position or time fix which is incorrect, has been gaining attention as spoofing has become more sophisticated. Various techniques have been proposed to detect if a receiver is being spoofed – with varying degrees of success and computational complexity. If the jammer signals are sufficiently plausible then the GNSS receiver may not realize it has been duped. There are various means of detecting spoofing activity and hence providing effective mitigation methods. In this paper, a novel signal processing method applicable to a single antenna handset receiver for spoofing detection has been described. Mathematical models and algorithms have been developed to solve the problems of satellite navigation safety. What has been considered in the paper is a spoofing detection algorithm based on the analysis of a civil satellite signal generated by mobile C/A GPS/GNSS single-antenna receivers. The work has also served to refine the civilian spoofing threat assessment by demonstrating the challenges involved in mounting a spoofing attack.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 52 (124); 145-153
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of oil spill fighting by using SAR satellite detection and e-navigation systems
    Autorzy:
    Bąk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/359631.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    oil spill
    satellite detection
    e-navigation system
    problems identification
    incidents
    Opis:
    The article presents the solution for improvement of oil spill fighting with utilization of synthetic aperture radar. The way of identification is presented as well as the treatment of obtained data in order to eliminated “looks like” objects. Such system will widely improve the oil spill fighting at a very early stage of incident.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 27-31
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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