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    Wyświetlanie 1-7 z 7
    Tytuł:
    Study of differential code GPS/GLONASS positioning
    Autorzy:
    Przestrzelski, P.
    Bakuła, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/320940.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    pseudorange
    differential positioning
    GPS
    GLONASS
    GNSS
    Opis:
    This paper presents the essential issues and problems associated with GNSS (Global Navigation Satellite System) code differential positioning simultaneously using observations from at least two independent satellite navigation systems. To this end, two satellite navigation systems were selected: GPS (Global Positioning System, USA) and GLONASS (GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, Russia). The major limitations and methods of their elimination are described, as well as the basic advantages and benefits resulting from the application of the DGNSS (Differential GNSS) positioning method. Theoretical considerations were verified with the post-processed observations gathered during a six-hour measurement. The data from selected reference stations of the ASG-EUPOS (Active Geodetic Network — EUPOS) system located at different distances from the rover site was used. The study showed that the DGNSS positioning method achieves higher accuracy and precision, and improves the stability of coordinate determination in the time domain, compared to positioning which uses only one satellite navigation system. However, it was shown that its navigational application requires further studies, especially for long distances from the reference station.
    W artykule przedstawiono zasadnicze zagadnienia i problemy odnoszące się do pozycjonowania opartego na różnicowych pomiarach kodowych GNSS przy równoczesnym wykorzystywaniu sygnałów od co najmniej dwóch niezależnych systemów nawigacji satelitarnej. W tym celu wybrano amerykański GPS oraz rosyjski GLONASS. W artykule opisano najważniejsze ograniczenia oraz metody ich eliminacji, jak również podstawowe zalety i korzyści będące wynikiem stosowania DGNSS (różnicowa wersja GNSS) dla pozycjonowania. Teoretyczne rozważania zostały zweryfikowane metodą opracowania w post-processingu obserwacji zebranych podczas sześciogodzinnej sesji pomiarowej. Do obliczeń użyto danych od wybranych stacji odniesienia ASG EUPOS (aktywna sieć geodezyjna). Badania wykazały, że metoda pozycjonowania DGNSS pozwala osiągnąć wyższą dokładność i precyzję, a także poprawić stabilność wyznaczanych współrzędnych w domenie czasu w porównaniu do metod opartych na wykorzystaniu sygnałów tylko od jednego systemu satelitarnego.
    Źródło:
    Annual of Navigation; 2014, 21; 117-132
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of real-time network code DGPS services of ASG-EUPOS in north-eastern Poland
    Autorzy:
    Przestrzelski, P.
    Bakuła, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/298124.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    pseudorange
    differential positioning
    network corrections
    GPS
    ASG-EUPOS
    Opis:
    This paper presents the performance study results of two ASG-EUPOS system services (KODGIS and NAWGIS) carrying out real-time network code DGPS positioning. In this elaboration, basic information about the system and discussed services are presented, as well as the advantages of the code differential positioning. The accuracies of the KODGIS and NAWGIS given by the system administrator are provided and papers and presentations with local and international impact were considered. A description of the experiment and the obtained results were provided for three days of measurements taken in north-eastern Poland, near Olsztyn. The research results showed that the positioning errors achieved using the KODGIS service throughout the study exceeded values declared by the ASG-EUPOS system administrator. This service, with respect to NAWGIS, was also characterized by higher fluctuations in the determined coordinates. Moreover, the occurrence of systematic errors in the performance of both studied services was noted, whereas the weakest element of the entire ASG-EUPOS system appeared to be the data transmission to the user.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(3); 191-207
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Propagation Characteristic of DGPS Correction Data Signal at Inland Sea - Propagation Characteristic on LF/MF Band Radio Wave
    Autorzy:
    Okuda, S.
    Toba, M.
    Arai, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/116409.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Maritime Distress and Safety System (GMDSS)
    Inland Sea
    Propagation Characteristic
    Differential Global Positioning System (DGPS)
    Radio Wave
    LF Band Radio Wave
    MF Band Radio Wave
    DGPS Correction Data Signal
    Opis:
    User at the Inland Sea requires high position accuracy which is 5 m (2drms) or less. Therefore the position accuracy of standalone GPS is insufficiency. Consequently it needs to use DGPS for navigator sailing the Inland Sea. We executed numerical simulation of the propagation characteristic on the extended line of bridge pier at opposite side from DGPS station, and already confirmed that bit error in DGPS correction data signal occurs, and that correction data could not form by bit error. Furthermore, we carried out numerical simulation of the propagation characteristic of DGPS correction data signal received at sailing through center of the bridge, and solved receiving condition of DGPS correction data signal before and after passing through the bridge. In this paper, we executed to inspect mutually results of electric field intensity simulation for oversea and overland propagation on some sea area of the Inland Sea and measuring results of electric field intensity for DGPS correction data signal, and evaluated the possibility of abnormal propagation comprehensively.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 549-554
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish DGPS System: 1995-2018 – studies of reference station operating zones
    Autorzy:
    Specht, C.
    Specht, M.
    Dąbrowski, P. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117143.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Polish DGPS System
    reference station operating zones
    history of navigation
    Differential GPS (DGPS)
    DGPS Reference Station
    positioning system
    Global Positioning System (GPS)
    Opis:
    The operating zone of a radio navigation system is one of its main operating features. It determines the size of a water body in which the system can be used, while guaranteeing vessels’ navigation safety. The DGPS system in the LF/MF range is now the basic positioning system in coastal waters around the world, which guarantees not only metre positioning accuracy, but it is also the only one to provide navigators with signals on positioning reliability. This paper describes and summarises over twenty years of studies dealing with the operating zone of the Polish DGPS reference station network. This paper is the fifth in a series of publications whose aim was to present in detail the process of installation, testing and long-term evaluation of the navigational parameters of the Polish DGPS system, launched in 1995. This paper includes the theoretical foundations of determination of the Dziwnów and Rozewie DGPS reference station operating zones in the years 1995-2018. Moreover, it presents the measurement results for the signal levels and the results of their analyses, which determine the station operating zones.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 581-586
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernization of Maritime DGPS in Poland
    Autorzy:
    Dziewicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116983.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Differential GPS (DGPS)
    Global Positioning System GPS
    IMO Requirements
    IALA Recommendations
    e-Navigation
    Maritime DGPS
    Radionavigation
    Opis:
    Some new techniques and functionality adopted for modernization of national DGPS systems by maritime administrations in Europe are presented. Any solution adopted must meet international requirements: IMO standards and IALA e-NAV Committee recommendations. The results of DGPS Re-capitalization Meeting in Gdynia 2008 are presented. Modernization and re-engineering of maritime DGPS must take into account backward compatibility with existing onboard receivers as well as future trends towards e-Navigation. Operational and legal status of the Polish DGPS network is also mentioned in this context.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 1; 39-42
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the IANS Chain Using a Satellite System
    Autorzy:
    Czaplewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/116843.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Interactive Navigational Structures (IANS)
    navigational methods
    navigation techniques
    terrestrial navigation
    vessel traffic service (VTS)
    satellite system
    satellite positioning system
    differential GPS (DGPS)
    Opis:
    This paper presents ideas for creating and developing Interactive Navigational Structures (IANS) by using satellite systems. The author of the present paper introduced the concept of IANS into the literature in 2004 (Czaplewski, 2004). The paper presents the possibility of adapting the contemporary methods of robust estimation that are used in geodesy for the purpose of performing selected marine navigation tasks. IANS utilise modern M-estimation methods. Interactive structures can assist human beings in carrying out special tasks at sea, for example, in identifying objects at sea and on land without the need to approach them. Moreover, these structures can also be used in the process of navigation carried out by underwater vehicles or unmanned watercraft. This paper presents the mathematical methods that are essential for creating IANS. The theoretical assumptions are illustrated with an example of how IANS can be used while performing a typical navigation task. The paper closes with information about research studies which deal with the practical aspects of using this set of mathematical methods.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 485-493
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Matlab Implementation of Differential GPS for Low-cost GPS Receivers
    Autorzy:
    Ali, Q
    Montenegro, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116127.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine navigation
    Global Positioning System GPS
    Matlab, Differential GPS (DGPS)
    GPS Receiver
    unmanned aerial vehicle (UAV)
    Global Navigation Satellite System (GNSS)
    RINEX Format
    Opis:
    A number of public codes exist for GPS positioning and baseline determination in off-line mode. However, no software code exists for DGPS exploiting correction factors at base stations, without relying on double difference information. In order to accomplish it, a methodology is introduced in MATLAB environment for DGPS using C/A pseudoranges on single frequency L1 only to make it feasible for low-cost GPS receivers. Our base station is at accurately surveyed reference point. Pseudoranges and geometric ranges are compared at base station to compute the correction factors. These correction factors are then handed over to rover for all valid satellites observed during an epoch. The rover takes it into account for its own true position determination for corresponding epoch. In order to validate the proposed algorithm, our rover is also placed at a pre-determined location. The proposed code is an appropriate and simple to use tool for post-processing of GPS raw data for accurate position determination of a rover e.g. Unmanned Aerial Vehicle during post-mission analysis.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 343-350
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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