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    Wyświetlanie 1-6 z 6
    Tytuł:
    Geometry of GPS and GLONASS for different number of operational satellites
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/320847.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    nawigacja
    nawigacja satelitarna
    radionawigacja
    GPS
    navigation
    satellite navigation systems
    radionavigation system
    Opis:
    Nowadays there are two world wide satellite navigation systems - American GPS and Russian GLONASS. Distribution (in per cent) and comparison (in per cent) of GDOP (Geometric Dilution Of Precision) coefficient values for different number of operational satellites for the observer at different latitude for different masking elevation angle for both systems are demonstrated in this paper.
    Źródło:
    Annual of Navigation; 2000, 2; 47-56
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of global navigation satellite systems in maritime navigation
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/135402.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    GNSS
    GPS system
    GNSS receiver
    shipborne GPS and GNSS receiver
    type of GPS and GNSS receivers
    maritime navigation
    Opis:
    Currently (April 2016) uninterrupted information about a ship’s position can be obtained from specialized electronic position-fixing systems, in particular, Satellite Navigation Systems (SNSs) such as GPS and GLONASS and Satellite Based Augmentation Systems (SBASs) such as EGNOS or WAAS. The generic name given to all the above mentioned systems is Global Navigation Satellite Systems (GNSS). Many models, designed for the ship’s bridge and provided by about a dozen manufacturers, are available on the world market. In Europe, one of the most comprehensive sources of knowledge on the global GNSS market is a report published, on average, every 15 months by the European GNSS Agency GSA. Another receiver survey is published each year in the January number of the magazine “GPS World”. The detailed analysis of market report and receiver survey, possible use of EGNOS and Galileo in the maritime market, and different maritime applications of GNSS equipment are described in this paper.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 74-79
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of geometry of Galileo and GPS in maritime and urban restricted area
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/320605.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    satelitarne systemy nawigacyjne
    GPS
    Galileo
    satellite navigation systems
    Galileo system
    Opis:
    In open area the accuracy of the observer’s position obtained from the satellite navigation systems depends on a number of satellites (ls) visible above masking elevation angle (Hmin) and the geometry of systems – GDOP coefficient. In restricted area (coastal navigation, urban area) system accuracy depends on the parameters mentioned for open area and the dimensions and situated area of the obstacles additionally. The calculations were made for the observer situated on the ship sailing along the coast and in the middle of the street for different obstacles heights for Galileo system and for GPS system. Street parameters were: the street axis azimuth and latitude phi.
    Źródło:
    Annual of Navigation; 2003, 6; 37-48
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nominal and Real Accuracy of the GPS Position Indicated by Different Maritime Receivers in Different Modes
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117133.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Global Positioning System GPS
    Navigational System
    Navigational System Receiver
    Accuracy of Position
    GPS Receiver
    GPS Position Accuracy
    Dilution of Precision (DOP)
    Opis:
    Nowadays on the ship’s bridge two or even more GPS receivers are installed. As in the major cases the coordinates of the position obtained from these receivers differ the following questions can be posed – what is the cause of this divergence, which receiver in the first must be taken into account etc. Based on information published in annual GPS and GNSS receiver survey it was estimated the percentage of GPS receivers designed for marine and/or navigation users. The measurements of GPS position based on the four different stationary GPS receivers were realized in the laboratory of Gdynia Maritime University in Poland in the summer 2012. The coordinates of the position of all these receivers were registered at the same time. The measurements in mode 3D were made for different input data, the same for all receivers. The distances between the individual unit’s antenna were considered also. Next measurements in mode 3D also were realized on two ships in different European ports. Additional measurements were made in mode 2D with three receivers for different their’s antenna heights. The results showed that the GPS position accuracy depends on the type of the receiver and its technical parameters particularly.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 11-19
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Satellite Navigation Systems in the transport, today and in the future
    Nawigacyjne systemy satelitarne w transporcie, obecnie i w przyszłości
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/224195.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nawigacyjne systemy satelitarne
    systemy nawigacyjne
    GPS
    GLONAS
    satelitarne systemy wspomagające
    satellite navigation systems
    maritime transportation
    land transportation
    transport markets
    Opis:
    Operational status and practical exploitation (October 2010) of Satellite Navigation Systems (SNS), as GPS and GLONASS, and Satellite Based Augmentation System (SBAS), as EGNOS are presented in this paper. Other SNS are under development as Galileo and Compass, other SBAS in various part of the world are already available (WAAS, MSAS) or under development as GAGAN or SDCM. The receivers of these systems are now found in every mode of transportation - air, maritime and land. Additionally SNS markets and applications in the transport and the most significant events in the satellite navigation systems in the nearest years and SNS markets and applications are described also.
    W artykule omówiono status operacyjny i problemy eksploatacyjne (październik 2010) nawigacyjnych systemów satelitarnych (SNS), takich jak GPS i GLONASS oraz satelitarnych systemów wspomagających (SBAS), takich jak EGNOS. W różnych częściach świata dostępne są inne systemy (WAAS i MSAS), kolejne (Galileo, Compass, QZSS, GAGAN) są na etapie budowy. Odbiorniki w/w systemów znalazły zastosowanie we wszystkich rodzajach transportu. Omówiono też najważniejsze wydarzenia jakich można spodziewać się w najbliższych latach w dziedzinie SNS oraz wykorzystanie tychże systemów na rynku transportowym.
    Źródło:
    Archives of Transport; 2010, 22, 2; 175-187
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    BeiDou and Galileo, Two Global Satellite Navigation Systems in Final Phase of the Construction, Visibility and Geometry
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117164.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    BeiDou
    Galileo
    GNSS construction
    GNSS geometry
    GNSS visibility
    Global Positioning System (GPS)
    Dilution of Precision (DOP)
    Opis:
    Spatial segment is one of three segments of each satellite navigation systems (SNS). Nowadays two SNSs, GPS and GLONASS, are fully operational, two next SNSs, BeiDou in China and Galileo in Europe, are in final phase of the construction. In the case of China system this segment will consist of 35 satellites with three types of orbits ? medium (MEO), geostationary (GEO) and inclined geosynchronous (IGSO). As GEO and IGSO satellites can be used in China and Asia-Pacific region only, BeiDou MEO constellation with 27 fully operational satellites will be taken into account in this paper. The orbital planes of the Galileo constellation will be divided in “slots” that contains at least one operational satellite. The Galileo reference constellation has 24 nominal orbital positions or operational slots in MEO homogeneously distributed in 3 orbital planes; i.e. 8 slots equally spaced per plane. As the error of user’s position obtained from both systems depends on geometry factor DOP (Dilution Of Precision) among other things the knowledge of the number of satellites visible by the user above given masking elevation angle Hmin and the distributions of DOP coefficient values, GDOP in particular, is very important. The lowest and the greatest number of satellites visible in open area by the observer at different latitudes for different Hmin, the percentage of satellites visible above angle H, distributions (in per cent) of satellites azimuths and GDOP coefficient values for different Hmin for BeiDou and Galileo systems at different latitudes are presented in the paper.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 3; 381-387
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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