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    Wyświetlanie 1-6 z 6
    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:
    Availability of the GNSS geodetic networks position during the hydrographic surveys in the ports
    Autorzy:
    Specht, C.
    Makar, A.
    Specht, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116211.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    hydrographic survey
    IHO S-44
    Global Positioning System (GPS)
    GLONASS
    gedetic network
    exclusive order
    special order
    Opis:
    Geodetic network GNSS receivers are more commonly associated with positioning systems used in maritime hydrography. In terms of positioning accuracy when no terrain obstacles are present, they meet international hydrographic surveys standards (S‐44) fully. Those standards are defined as 1m (0.95) for Exclusive Order and 2m (0.95) for Special Order. It is equally as important to ensure access to position which error is not higher than above mentioned maximum values. This is most often determined by the density of port infrastructure. This article presents the results of analysis of availability of hydrographic system that operates based on geodetic GNSS networks. Hydrographic surveys in question were undertaken in inner basins with diverse infrastructure. Three representative types of ports were selected for this reason: fishing type (Hel), medium sized, modern commercial type (Gdynia) and highly congested, narrow canal type (Gdansk – Motlawa). A nonpublic, geodetic GNSS network was used for all surveys. It is worth mentioning that the above network is at the moment the only available network that provides both GPS and GLONASS corrections. The surveys provided evidence that geodetic GNSS networks can be successfully utilised to determine position of hydrographic vessel in low and moderately developed ports as well as in Exclusive and Special Orders. In highly congested ports however, the availability of the above mentioned method of measurement can be insufficient to realise a survey.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 657-661
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of a least squares with conditional equations method in positioning a tramway track in the Gdansk agglomeration
    Autorzy:
    Czaplewski, K.
    Specht, C.
    Dąbrowski, P.
    Specht, M.
    Wiśniewski, Z.
    Koc, W.
    Wilk, A.
    Karwowski, K.
    Chrostowski, P.
    Szmagliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116443.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Least Squares Method (LSQ)
    Conditional Equations Method
    tramway track
    Gdansk Agglomeration
    MathCad
    rail vehicle trajectory
    Global Positioning System (GPS)
    satNav receiver
    Opis:
    Satellite measurement techniques have been used for many years in different types of human activity, including work related to staking out and making use of rail infrastructure. First and foremost, satellite techniques are applied to determine the tramway track course and to analyse the changes of its position during its operation. This paper proposes using the least squares with conditional equations method, known in geodesy (LSce). When applied, this method will allow for improvement of the final determination accuracy. This paper presents a simplified solution to the LSce alignment problem. The simplification involves replacement of the parameter binding equations with equivalent observational equations with properly selected weights. The results obtained with such a solution were demonstrated with a randomly selected section of a tramway track in Gdańsk. The article presents the theoretical foundations of the test method, the experiment organisation and the results obtained with MathCad Prime 3.0 software. It also presents the outcome of a study associated with the execution of the project No POIR.04.01.01-00-0017/17 entitled “Developing an innovative method of precision determination of a rail vehicle trajectory” executed by a consortium of the Gdańsk University of Technology and Gdynia Maritime University.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 895-900
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of the GPS positioning system in the context of increasing the number of satellites in the constellation
    Autorzy:
    Specht, C.
    Mania, M.
    Skora, M.
    Specht, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259507.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    GPS
    User Range Error
    Dilution of Precision
    GPS Almanac
    Accuracy of Positioning
    Opis:
    A possibility of utilising the GPS system for navigation and transport are fundamentally dependent on the accuracy in positioning. Two fundamental factors decisive for its value are the values of the User Range Error (URE) and Dilution of Precision (DOP), strictly related to the number of satellites forming the constellation. The nominal constellation of GPS satellites consists of 24 units which gives a possibility of identification of coordinates all over the globe. In the last few years, however, the nominal number of satellites in the constellation was much higher, and the URE value has been constantly increasing. The authors of the paper try to estimate the impact of the changing number of GPS satellites on accuracy of position coordinates with a variable URE value. Mathematical model for estimating geometrical indicators’ value, utilizing data derived from the almanac files has been presented. Following a drawn-up algorithm and calculations made with Mathcad software, the authors carried out a comparative analysis of mean daily values of DOP indicators for a variable number of satellites included in the GPS constellation in the years 2001-2013. Then, the authors have established representative values of Two Distance Root Mean Square Error (2drms) 2D and 3D, and calculated a percentage increase of accuracy in the period under discussion.
    Źródło:
    Polish Maritime Research; 2015, 2; 9-14
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the positioning accuracy of the EGNOS and DGPS systems based on the long-term measurements in the years 2006-2014
    Autorzy:
    Specht, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/92498.pdf
    Data publikacji:
    2015
    Wydawca:
    Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
    Tematy:
    DGPS
    EGNOS
    GPS
    positioning accuracy
    long-term measurement campaigns
    Opis:
    The DGPS (Differential GPS) and EGNOS (European Geostationary Navigation Overlay Service) systems belong to a group of systems supporting the global satellite system GPS (Global Positioning System). These systems have significantly better navigation performance than GPS and, therefore, they are widely used in the maritime, civil and air navigation. The analysis of the positioning accuracy of GPS leads to the conclusion: from year to year the accuracy of the positioning determination increases. The effect of the permanent increasing of the GPS positioning accuracy is the parallel increasing of the positioning accuracies of all the supporting systems. In connection with the constant improvement of the precision characteristics of the above mentioned systems on one hand and the fact, that the users do not possess the current information about the actual status of these characteristics on the other hand, it is reasonable to conduct the periodical research in this area. For that purpose the long-term measurement campaigns were realized in the years 2006-2014; the values of measures, describing the positioning accuracies obtained by both systems, were determined on the basis of those campaigns.
    Źródło:
    Polish Cartographical Review; 2015, 47, 2; 99-108
    2450-6974
    Pojawia się w:
    Polish Cartographical Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena dokładności określenia pozycji systemów EGNOS i DGPS na podstawie wieloletnich pomiarów w latach 2006–2014
    Estimating accuracy of defining position by EGNOS and DGPS systems based on multi-year measurements in 2006–2014
    Autorzy:
    Specht, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/204468.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    system DGPS
    system EGNOS
    system GPS
    dokładność określenia pozycji
    długoterminowe kampanie pomiarowe
    DGPS
    EGNOS
    GPS
    accuracy of positioning
    long-term measurement campaigns
    Opis:
    Systemy DGPS (ang. Differential GPS) i EGNOS (ang. European Geostationary Navigation Overlay Service) zalicza się do grupy satelitarnych systemów wspomagających (ang. Satellite Based Augmentation System – SBAS). Systemy te cechują się znacznie lepszymi charakterystykami nawigacyjnymi niż system GPS, w związku z czym znajdują szerokie zastosowanie w nawigacji morskiej, lądowej i powietrznej. Na podstawie przeprowadzonych analiz stwierdzono, że z roku na rok zwiększa się dokładność określenia pozycji przez system GPS. Skutkiem tego jest równoległe zwiększanie dokładności określenia pozycji przez wszystkie systemy wspomagające. W związku z tym, że charakterystyki dokładnościowe wspomnianych systemów ulegają ciągłej poprawie, a ich użytkownicy nie posiadają bieżącej informacji o aktualnym stanie, to zasadne jest przeprowadzenie okresowych badań w tym zakresie. W tym celu zrealizowano długoterminowe kampanie pomiarowe w latach 2006–2014 i na ich podstawie wyznaczono wartości miar opisujących dokładności określenia pozycji uzyskiwane przez oba systemy.
    DGPS and EGNOS belong to a group of satellite based augmentation systems (SBAS). These systems have much better navigational characteristics than the GPS, and therefore are widely used in sea, land and air navigation. On the basis of the analyses follow that the GPS increases the accuracy in determining the position from year to year. The effect is parallel to the increase of accuracy of the positioning delivered by all of augmentation systems. In view of the fact that the accuracy characteristics of these systems are being improved on constant basis and that their users don’t have current information about the actual status, it is reasonable to conduct periodic researches in this area. For this purpose, the long-term measurement campaigns were executed in years 2006–2014, and based on their results they indicated the values of measures describing the accuracy of positions obtained by both systems.
    Źródło:
    Polski Przegląd Kartograficzny; 2015, T. 47, nr 2, 2; 127-136
    0324-8321
    Pojawia się w:
    Polski Przegląd Kartograficzny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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