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Selected Problems of Determining the Course of Railway Routes by Use of GPS Network Solution

Władysław Koc Cezary Specht
Archives of Transport | 2011 | No 3
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Authors and Affiliations

Władysław Koc
Cezary Specht

The Accuracy Assessment of Determining the Axis of Railway Track Basing on the Satellite Surveying

Władysław Koc Cezary Specht Piotr Chrostowski Katarzyna Palikowska
Archives of Transport | 2012 | No 3
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Authors and Affiliations

Władysław Koc
Cezary Specht
Piotr Chrostowski
Katarzyna Palikowska

Accuracy assessment of mobile satellite measurements in relation to the geometrical layout of rail tracks

Cezary Specht Władysław Koc Piotr Chrostowski Jacek Szmagliński
Metrology and Measurement Systems | 2019 | vol. 26 | No 2 | 309-321 | DOI: 10.24425/mms.2019.128359
Keywords positioning data processing track geometric layout GNSS satellite surveying horizontal andvertical accuracy evaluation
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Abstract

The paper presents the campaigns of mobile satellite measurements, carried out in 2009–2015 on the railway and tram lines. The accuracy of the measurement method has been analysed on the basis of the results obtained in both horizontal and vertical planes. The track axis deviation from the defined geometric shape has been analysed in the areas clearly defined in terms of geometry, i.e. on the straight sections and sections with constant longitudinal inclination. The values of measurement errors have been estimated on the basis of signals subjected to appropriate processes of filtration. The paper attempts to evaluate the changing possibilities of using the GNSS techniques to determine the shape of the railway track axis from 2009 to 2015. The determined average value of the measurement error now equals a few millimetres. This achievement is very promising for the prospects of mobile satellite measurements in railway engineering.

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Authors and Affiliations

Cezary Specht
Władysław Koc
Piotr Chrostowski
Jacek Szmagliński

Determining horizontal curvature of railway track axis in mobile satellite measurements

Władysław Koc Andrzej Wilk Cezary Specht Krzysztof Karwowski Jacek Skibicki Krzysztof Czaplewski Slawomir Judek Piotr Chrostowski Jacek Szmagliński Paweł Dąbrowski Mariusz Specht Sławomir Grulkowski Roksana Licow
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e139204 | DOI: 10.24425/bpasts.2021.139204
Keywords GNSS measurements railway track axis horizontal curvature moving chord method application accuracy assessment
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Abstract

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.
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Authors and Affiliations

Władysław Koc
1
ORCID: ORCID
Andrzej Wilk
1
ORCID: ORCID
Cezary Specht
2
Krzysztof Karwowski
1
Jacek Skibicki
1
Krzysztof Czaplewski
2
Slawomir Judek
1
Piotr Chrostowski
3
Jacek Szmagliński
3
Paweł Dąbrowski
2
ORCID: ORCID
Mariusz Specht
2
Sławomir Grulkowski
3
Roksana Licow
3
  1. Gdańsk University of Technology, Faculty of Electrical and Control Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland
  2. Gdynia Maritime University, Faculty of Navigation, al. Jana Pawła II 3, 81-345 Gdynia, Poland
  3. Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland

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