scholarly journals Determination of the tram track axis using a multi receiver GNSS measurement system

2020 ◽  
Vol 2020 (4) ◽  
pp. 1-17
Author(s):  
Andrzej Wilk ◽  
◽  
Cezary Specht ◽  
Władysław Koc ◽  
Krzysztof Karwowski ◽  
...  
Keyword(s):  
Interdisciplinary Research ◽  
Railway Track ◽  
Satellite Measurement ◽  
Accuracy Analysis ◽  
Satellite Measurements ◽  
University Of Technology ◽  
Gnss Receivers ◽  
Multiple Measurements ◽  
Mobile Satellite

This article refers to research, that has been conducted by an interdisciplinary research team from the Gdańsk University of Technology and the Maritime University in Gdynia since 2009. These investigation concerns the determination of a railway track axis using the mobile satellite measurement technique. Following the dynamic development of GNSS techniques, that could be seen in the last decade, the team carried out further experiments aimed at developing an effective measurement method. Using the acquired experience in this period, another measurement campaign was carried out on the tram tracks in Gdansk. The main goal of these measurements was to check how the new assumptions regarding the method of mounting the antennas as well as their placement on the measuring platform will work in various field conditions. For this purpose, ten sets of GNSS receivers offered by two independent manufacturers – currently market leaders – were used. The choice of testing track section made it possible to analyze the repeatability of results obtained from multiple measurements in conditions of varying GNSS signal availability. The article presents in a synthetic way the course of this research and the obtained results. Keywords: Tram track; Satellite measurements; Accuracy analysis

scholarly journals Verification of GNSS Measurements of the Railway Track Using Standard Techniques for Determining Coordinates

2020 ◽  
Vol 12 (18) ◽  
pp. 2874 ◽  
Author(s):  
Cezary Specht ◽  
Andrzej Wilk ◽  
Wladyslaw Koc ◽  
Krzysztof Karwowski ◽  
Paweł Dąbrowski ◽  
...  
Keyword(s):  
Measuring System ◽  
Railway Track ◽  
Satellite Measurements ◽  
Railway Line ◽  
University Of Technology ◽  
Railway Infrastructure ◽  
Spatial System ◽  
Mobile Satellite ◽  
Gnss Measurements ◽  
Geometric Layout

The problem of the reproduction of the railway geometric layout in the global spatial system is currently solved in the form of measurements that use geodetic railway networks and also, in recent years, efficient methods of mobile positioning (mainly satellite and inert). The team of authors from the Gdańsk University of Technology and the Maritime University in Gdynia as part of the research project InnoSatTrack is looking for effective and efficient methods for the inventory of railway lines. The research is part of a wider investigation BRIK (Research and Development in Railway Infrastructure, in polish: Badania i Rozwój w Infrastrukturze Kolejowej). This paper presents a comparative analysis of the problem of the reproduction of the trajectory of the measuring system using tacheometry, satellite measurements made using a measurement trolley, and mobile satellite measurements. Algorithms enabling the assessment of the compliance of satellite measurements with classic tacheometric measurements were presented. To this end, the authors held measurement sessions using modern geodetic instruments and satellite navigation on a section of the railway line. The results of the measurements indicate the convergence of the level of accuracy achieved by different measuring techniques.

scholarly journals Analytical design method of reverse curves

2016 ◽  
Vol 2016 (6) ◽  
pp. 14-25
Author(s):  
Władysław Koc
Keyword(s):  
Design Method ◽  
Railway Track ◽  
Mathematical Notation ◽  
Satellite Measurements ◽  
New Approach ◽  
Analytical Design ◽  
Circular Arcs ◽  
Mobile Satellite ◽  
Transition Curves

The paper deals with a new approach relating to the design of the region of railway track direction alteration adapted to Mobile Satellite Measurements technique. The method may be particularly useful in situations when both the straights of the route directions cannot be connected in an elementary way using a circular arc with transition curves; this also refers to the application of a compound curve. Thus the only solution becomes the application of two circular arcs of opposite curvature signs to the geometric system, i.e. the use of an inverse curve. The solution of the design problem takes advantage of a mathematical notation and concentrates on the determination of universal equations describing the entire geometric system. This is a sequential operation involving successive parts of the system. The presented method has been illustrated by appropriate calculation examples.

scholarly journals Design of compound curves adapted to the satellite measurements

2015 ◽  
Vol 34 (2) ◽  
pp. 37-49 ◽  
Author(s):  
Władysław Koc
Keyword(s):  
Design Problem ◽  
Local System ◽  
Railway Track ◽  
Satellite Measurements ◽  
New Approach ◽  
Circular Arcs ◽  
Main Track ◽  
Mobile Satellite ◽  
New System

The paper deals with a novelty related to the design of a region for an alternative railway track direction adequate for mobile satellite measurements. The new approach may become particularly useful in the design of the existing track axis control when the determination of both the main track directions becomes impossible. The only solution in that case is to apply to the geometrical system two circular arcs of a different radius, namely, to take advantage of compound curves. In the presented method the design of a new system is carried out by the use of the local system of coordinates. The solution of the design problem is aided by mathematical recording and is based on the determination of some universal equations describing the entire geometrical system. This procedure takes place sequentially involving consecutive parts of the system. The method has been illustrated by an appropriate calculation example.

scholarly journals Application of Least Squares with Conditional Equations Method for Railway Track Inventory Using GNSS Observations

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4948
Author(s):  
Krzysztof Czaplewski ◽  
Zbigniew Wisniewski ◽  
Cezary Specht ◽  
Andrzej Wilk ◽  
Wladyslaw Koc ◽  
...  
Keyword(s):  
Measurement Data ◽  
Satellite System ◽  
Theoretical Description ◽  
Railway Track ◽  
Land Surveying ◽  
Gnss Receivers ◽  
Mobile Satellite ◽  
Global Navigation Satellite ◽  
Gnss Observations ◽  
Observation Results

Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the adaptation of research methods known in other fields of science offers an opportunity to acquire highly accurate solutions for railway track inventory. This article presents the effects of work carried out using a mobile surveying platform on which Global Navigation Satellite System (GNSS) receivers were mounted. The satellite observations (surveys) obtained were aligned using one of the methods known from classical land surveying. The records obtained during the surveying campaign on a 246th km railway track section were subjected to alignment. This article provides a description of the surveying campaign necessary to obtain measurement data and a theoretical description of the method employed to align observation results as well as their visualisation.

scholarly journals The analytical design method of railway route’s main directions intersection area

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Wladysław Koc
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Analytical Form ◽  
Local System ◽  
Railway Track ◽  
Satellite Measurements ◽  
Railway Line ◽  
Universal Approach ◽  
Intersection Area ◽  
Mobile Satellite

Abstract The paper presents a design method related to railway track sections situated in a bend. In the method advantage is taken of an analytical form of description by using appropriate mathematical formulae. This may becomeparticularly usefulwhen the investigations are based on the data obtained from mobile satellite measurements. In the paper attention is concentrated on an universal approach creating an opportunity to diversify the type and length of the transition curves in use. The design procedure of the geometric lay-out is allocated to a particular local system of coordinates to be followed by a special transfer of the obtained solution to the national frame of space references 2000. The adopted course of procedure together with adequate theoretical relations has been provided. All the study has been illustrated with calculation examples based on data obtained from the railway line in operation.

scholarly journals ACCURACY ANALYSIS OF THE SATELLITE POSITIONING BY USING GNSS REFERENCE STATIONS

2020 ◽  
pp. 350-354
Author(s):  
A.U. Chymyrov ◽  
Sh.S. Sargazakova ◽  
N.Y. Ismailov
Keyword(s):  
Accuracy Analysis ◽  
Satellite Measurements ◽  
Positioning Accuracy ◽  
Satellite Positioning ◽  
Control Centre ◽  
Gnss Receivers

The technology of satellite positioning by using RTK service by the KyrPOS -Control Centre of CORS Network is studied in this article. Differentially corrected satellite measurements with geodetic class GNSS receivers were done and their positioning accuracy was analyzed.

scholarly journals Analysis of the possibilities in railways shape assessing using GNSS mobile measurements

2019 ◽  
Vol 262 ◽  
pp. 11004 ◽  
Author(s):  
Wladyslaw Koc ◽  
Cezary Specht ◽  
Piotr Chrostowski ◽  
Jacek Szmagliński
Keyword(s):  
Low Cost ◽  
Railway Track ◽  
Satellite Measurements ◽  
Positioning Systems ◽  
Railway Line ◽  
Design Changes ◽  
Satellite Positioning ◽  
Measurement Methodology ◽  
Mobile Satellite ◽  
Gnss Measurements

In recent years, a dynamic development of satellite positioning techniques using both static and mobile GNSS coordinates register mode can be observed. In addition, still developing Real-time GNSS Networks, post-processing algorithms and another measurement signal analysis algorithms, make the satellite measurements increasingly used in railway industry sector. In the article the possibilities which follows from the mobile satellite measurements in railway engineering are briefly presented. In the years 2009-2015, the authors conducted a series of field investigations on operated railway lines. The obtained results of these measurements led to the development of a number of algorithms that increase the range of applicability of GNSS measurements. The analysis of obtained results also showed how the accuracy of the measurements have increased since 2009. The achieved accuracy has been increased due to a development of GNSS positioning systems as well as improvement of the measurement methodology, i.e. configurations of satellite receivers and layouts of their placement on a mobile measuring platform. It was also found that the development of data analysis algorithms contributed to the increase in the obtained accuracy in assessment of a railway track axis shape. The authors indicate the possibilities of applying GNSS techniques at various stages of construction and operation of railways. According to the authors, the most important advantage of both the presented measurement technique and computational methodology is the ability to effectively and relatively low-cost data acquisition regarding the existing state of the railway line. These data can be successfully used to design changes to the geometry of railway lines, and therefore satellite positioning has enormous application potential in the process of modernization of operated railway lines.

scholarly journals Computer-aided evaluation of the railway track geometry on the basis of satellite measurements

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Cezary Specht ◽  
Władysław Koc ◽  
Piotr Chrostowski
Keyword(s):  
Measurement Techniques ◽  
Transportation Systems ◽  
Global Navigation Satellite Systems ◽  
Railway Track ◽  
Second Phase ◽  
Satellite Measurements ◽  
Track Geometry ◽  
Satellite Systems ◽  
Mobile Satellite ◽  
Global Navigation Satellite

Abstract In recent years, all over the world there has been a period of intensive development of GNSS (Global Navigation Satellite Systems) measurement techniques and their extension for the purpose of their applications in the field of surveying and navigation. Moreover, in many countries a rising trend in the development of rail transportation systems has been noticed. In this paper, a method of railway track geometry assessment based on mobile satellite measurements is presented. The paper shows the implementation effects of satellite surveying railway geometry. The investigation process described in the paper is divided on two phases. The first phase is the GNSS mobile surveying and the analysis obtained data. The second phase is the analysis of the track geometry using the flat coordinates from the surveying. The visualization of the measured route, separation and quality assessment of the uniform geometric elements (straight sections, arcs), identification of the track polygon (main directions and intersection angles) are discussed and illustrated by the calculation example within the article.

scholarly journals Evaluation of the Possibility of Identifying a Complex Polygonal Tram Track Layout Using Multiple Satellite Measurements

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4408
Author(s):  
Andrzej Wilk ◽  
Cezary Specht ◽  
Wladyslaw Koc ◽  
Krzysztof Karwowski ◽  
Jacek Skibicki ◽  
...  
Keyword(s):  
Measurement Data ◽  
Satellite System ◽  
Infrastructure Management ◽  
Satellite Measurements ◽  
University Of Technology ◽  
Management Processes ◽  
Railway Infrastructure ◽  
Mobile Satellite ◽  
Global Navigation Satellite ◽  
Geometric Layout

We present the main assumptions about the algorithmization of the analysis of measurement data recorded in mobile satellite measurements. The research team from the Gdańsk University of Technology and the Maritime University in Gdynia, as part of a research project conducted in cooperation with PKP PLK (Polish Railway Infrastructure Manager), developed algorithms supporting the identification and assessment of track axis layout. This article presents selected issues concerning the identification of a tramway line’s axis system. For this purpose, the supporting algorithm was developed and measurement data recorded using Global Navigation Satellite System (GNSS) techniques was evaluated and analyzed. The discussed algorithm identifies main track directions from multi-device data and repeated position recordings. In order to observe the influence of crucial factors, the investigated route was carefully selected. The chosen tramway track was characterized by its location in various field conditions and a diversified and complex geometric layout. The analysis of the obtained results was focused on the assessment of the signal’s dispersion and repeatability using residuals in relation to the estimated track’s direction. The presented methodology is intended to support railway infrastructure management processes, mainly in planning and maintenance through an efficient inventory of the infrastructure in service.

scholarly journals Design of Reverse Curves Adapted to the Satellite Measurements

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Wladyslaw Koc
Keyword(s):  
Local Coordinate System ◽  
Computer Software ◽  
Optimization Techniques ◽  
Mathematical Notation ◽  
Satellite Measurements ◽  
Direction Change ◽  
Circular Arcs ◽  
Mobile Satellite ◽  
Transition Curves

The paper presents a new method for designing railway route in the direction change area adapted to the Mobile Satellite Measurements technique. The method may be particularly useful in the situations when both tangents cannot be connected in an elementary way using a circular arc with transition curves. Thus, the only solution would be the application of two circular arcs of opposite curvature signs, that is, the use of an inverse curve. It has been assumed that the design of the geometrical layout will take place within an adequate local coordinate system. The solution of the design problem takes advantage of a mathematical notation and concentrates on the determination of universal equations describing the entire geometrical layout. This is a sequential operation involving successive parts of the mentioned layout. This universal algorithm can be easily applied to the computer software which will allow generating, in an automatic way, other geometrical layouts. Then, the choice of the most beneficial variant from the point of obtained trains velocities while minimizing the track axis offsets will be held using the optimization techniques. The current designing methods do not provide such opportunities. The presented method has been illustrated by appropriate calculation examples.

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