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    Wyświetlanie 1-9 z 9
    Tytuł:
    Experimental studies on the relationship between HDOP and position error in the GPS system
    Autorzy:
    Specht, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2052120.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Global Positioning System
    GPS
    Horizontal Dilution of Precision
    HDOP
    position error
    Opis:
    2D position error in the Global Positioning System GPS depends on the horizontal dilution of precision (HDOP) and User Equivalent Range Error UERE. The non-dimensional HDOP coeffcient, determining the influence of satellite distribution on the positioning accuracy, can be calculated exactly for a given moment in time. However, the UERE value is a magnitude variable in time, especially due to errors in radio propagation (ionosphere and troposphere effects) and it cannot be precisely predicted. The variability of the UERE causes the actual measurements (despite an exact theoretical mathematical correlation between the HDOP value and the position error) to indicate that position errors differ for the same HDOP value. The aim of this article is to determine the relation between the GPS position error and the HDOP value. It is possible only statistically, based on an analysis of an exceptionally large measurement sample. To this end, measurement results of a 10-day GPS measurement campaign (900,000 fixes) have been used. For HDOP values (in the range of 0.6-1.8), position errors were recorded and analysed to determine the statistical distribution of GPS position errors corresponding to various HDOP values. The experimental study and statistical analyses showed that the most common HDOP values in the GPS system are magnitudes of: 0.7 ( = 0.353) and 0.8 ( = 0.432). Only 2.77% of fixes indicated an HDOP value larger than 1. Moreover, 95% of measurements featured a geometric coeffcient of 0.973 - this is why it can be assumed that in optimal conditions (without local terrain obstacles), the GPS system is capable of providing values of HDOP ≤ 1, with a probability greater than 95% (2). Obtaining a low HDOP value, which results in a low GPS position error value, calls for providing a high mean number of satellites (12 or more) and low variability in their numer.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 17-36
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish DGPS system: 1995–2017 – study of positioning accuracy
    Autorzy:
    Specht, Cezary
    Smolarek, Leszek
    Pawelski, Jan
    Specht, Mariusz
    Dąbrowski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/259085.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Polish DGPS system
    positioning accuracy
    position accuracy measures
    Opis:
    This paper is the fourth in a series of publications presenting the process of installation, testing and long-term assessment of the navigational parameters of the Polish DGPS system. This series of publications intends to present – to the general public – the accomplishments of teams of Polish scientists who have been working for years to make the DGPS the main positioning system used in the Polish sea areas. A considerable part of the materials presented in this paper has never been published. The article presents changes in the position accuracy of the Polish DGPS system over 20 years. Both dynamic tests performed on vessels as well as static measurements campaigns were analysed. The publication contains selected results achieved in its installation and testing in 1995–1997 supplemented with the results of studies conducted in the years: 2006, 2010, 2014, 2017. During this period the position accuracy increased from 2–8 m (1996) to approx. 1–2 m (2010) due to three reasons: turning – off the Selective Availability (2000), technical modernization of reference stations (2010) and continuous – over many years – reducing GPS signal-in-space pseudorange errors, which results in increased position accuracy in all GPS augmentation systems.
    Źródło:
    Polish Maritime Research; 2019, 2; 15-21
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atypical application of the parametric method for track infrastructure inventory
    Autorzy:
    Czaplewski, Krzysztof
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Karwowski, Krzysztof
    Dąbrowski, Paweł
    Specht, Mariusz
    Chrostowski, Piotr
    Szmaglinski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/906041.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    inland navigation
    alignment methods
    navigation infrastructure
    navigation
    tracks
    data analysis
    Opis:
    For many years, satellite systems have seen widespread use in a variety of technical applications, as well as in operations related to setting-out and the exploitation of track infrastructure. Their main applications include an inventory of the trackage course and detecting changes in its position. In both of these tasks, the most important element that determines the quality of an analyses is the high accuracy of the determinations being carried out. Satellite surveying techniques are not always sufficiently accurate, and in such cases, it is necessary to employ other land surveying methods to process surveying data. This article presents the authors’ considerations with regards to the possibility of applying one of the most common land surveying adjustment methods, the parametric method, to operations related to an inventory of tram infrastructure in Gdańsk. The results are based on surveys carried out during a surveying campaign in the autumn of 2018. The considerations presented in the article concern a small part of the research conducted under project No. POIR.04.01.01-00-0017/17 entitled “Development of an innovative method for determining the precise trajectory of a railborne vehicle” which is being implemented by a consortium of Gdansk University of Technology and Gdynia Maritime University
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 61 (133); 31-38
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Installation of GNSS receivers on a mobile railway platform – methodology and measurement aspects
    Autorzy:
    Dąbrowski, Paweł S.
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Czaplewski, Krzysztof
    Karwowski, Krzysztof
    Specht, Mariusz
    Chrostowski, Piotr
    Szmagliński, Jacek
    Grulkowski, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/135238.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    BRIK
    GNSS
    railway measurements
    railway track
    railway track axis
    staking out
    electronic total station
    Opis:
    Determining the course of a railway track axis using satellite methods relies on ensuring the precise assembly of GNSS receivers in dedicated measuring devices. Depending on the number of receivers, solutions that are based on placing the apparatus directly above the railway track axis (as well as in eccentric positions) are used to indirectly obtain data to form the basis of the desired results. This publication describes the installation of five GNSS receivers on a mobile measuring platform as part of the InnoSatTrack project. The methodology and the procedure of the geodetic measurements required to obtain the geometrical configuration of the measuring apparatus, specified in the technical project, are presented. The publication presents the principles of total station measurement methods as well as the steps taken to achieve precise results from staking out. The process of acquiring the same configuration of the GNSS receivers, based on the geometry of the squares on the two measuring platforms that were used in the research, has been shown. The final determination of the position of the receivers did not exceed an error of 0.010 m with an average error of 0.003 m, despite the occurrence of mounting difficulties. The results have demonstrated the high credibility and effectiveness of the presented solution.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 18-26
    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:
    Correction of determined coordinates of railway tracks in mobile satellite measurements
    Korygowanie wyznaczonych współrzędnych osi toru kolejowego w mobilnych pomiarach satelitarnych
    Autorzy:
    Wilk, Andrzej
    Specht, Cezary
    Koc, Wladyslaw
    Karwowski, Krzysztof
    Skibicki, Jacek
    Czaplewski, Krzysztof
    Chrostowski, Piotr
    Dabrowski, Pawel S.
    Grulkowski, Sławomir
    Judek, Slawomir
    Specht, Mariusz
    Szmagliński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/328601.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    track geometric layout
    GNSS/INS/MLS measurements
    RTK measurements
    data processing
    układ geometryczny toru
    pomiary GNSS/INS/MLS
    pomiary mobilne RTK
    przetwarzanie danych
    Opis:
    This article examines one of the basic issues related to the technique of mobile satellite measurements in railway tracks. This problem concerns the correction of the determined coordinates of the track centerline. The need to perform this operation results from the GNSS receivers positioning at a certain height above the level of the existing track axis, leading to longitudinal and lateral shifts of antennas. The key problem here is the determination of the local horizontal coordinate system in each measured position. For the analysis, the authors defined the directional baseline vector of the measuring platform on the basis of positions given by two satellite antennas, positioned over the pivots of its bogies. This work presents the procedure for determining the corrections values.
    W pracy poruszono jedną z podstawowych kwestii związanych z techniką mobilnych pomiarów satelitarnych w torze kolejowym – korygowanie wyznaczonych współrzędnych osi toru. Konieczność przeprowadzenia tej operacji wynika z ustawienia anten GNSS na pewnej wysokości nad poziomem istniejącej osi toru, przy występowaniu jego pochylenia w kierunku podłużnym i poprzecznym. Kluczowym problemem staje się przy tym konieczność określania w każdym punkcie pomiarowym kierunków osi układu współrzędnych w płaszczyźnie poziomej. W omawianej metodzie posłużono się kierunkowym wektorem bazowym, wyznaczonym na podstawie współrzędnych anten usytuowanych nad czopami skrętów obydwu wózków platformy. W pracy przedstawiono procedurę określania wartości korekt.
    Źródło:
    Diagnostyka; 2020, 21, 3; 77-85
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining horizontal curvature of railway track axis in mobile satellite measurements
    Autorzy:
    Koc, Władysław
    Wilk, Andrzej
    Specht, Cezary
    Karwowski, Krzysztof
    Skibicki, Jacek
    Czaplewski, Krzysztof
    Judek, Sławomir
    Chrostowski, Piotr
    Szmagliński, Jacek
    Dąbrowski, Paweł
    Specht, Mariusz
    Grulkowski, Sławomir
    Licow, Roksana
    Powiązania:
    https://bibliotekanauki.pl/articles/2086882.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GNSS measurements
    railway track axis
    horizontal curvature
    moving chord method
    application
    accuracy assessment
    pomiary GNSS
    tor kolejowy
    oś
    krzywizna pozioma
    metoda ruchomej cięciwy
    zastosowanie
    ocena dokładności
    Opis:
    The article discusses the applicability of a novel method to determine horizontal curvature of the railway track axis based on results of mobile satellite measurements. The method is based on inclination angle changes of a moving chord in the Cartesian coordinate system. In the presented case, the variant referred to as the method of two virtual chords is applied. It consists in maneuvering with only one GNSS (Global Navigation Satellite System) receiver. The assumptions of the novel method are formulated, and an assessment of its application in the performed campaign of mobile satellite measurements is presented. The shape of the measured railway axis is shown in the national spatial reference system PL-2000, and the speed of the measuring trolley during measurement is calculated based on the recorded coordinates. It has been observed that over the test section, the curvature ordinates differ from the expected waveform, which can be caused by disturbances of the measuring trolley trajectory. However, this problem can easily be overcome by filtering the measured track axis ordinates to obtain the correct shape – this refers to all track segments: straight sections, circular arcs and transition curves. The virtual chord method can also constitute the basis for assessing the quality of the recorded satellite signal. The performed analysis has shown high accuracy of the measuring process.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139204, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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