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Abstract
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.
Highlights
The railway lines, from the point of view of their shape, feature a precisely defined geometric layout, in particular in a horizontal plane
These distributions show that the average offsets |ERR| for various GNSS measurement methods relative to the reference, which is a tacheometric measurement, amount to several millimeters with a relatively small standard deviation
In the section between kilometer 10 + 200 m and kilometer 10 + 900 m, there is a circular curve with a radius of about 1000 m. This value is known from the technical documentation of the railway line and it was confirmed in the GNSS signal analysis
Summary
The railway lines, from the point of view of their shape, feature a precisely defined geometric layout, in particular in a horizontal plane. With the increasing popularity of precise and accurate techniques of mapping points in the spatial reference system, a methodology of measuring the track in terms of global coordinates is introduced more often than not6 [6] Before this trend appeared, measurement techniques were used, which allowed the reproduction of geometric systems in local reference systems, most often associated with the railroad track itself (involute methods) [7] 7or with control marks located nearby [8,9,10,11,12,13]. It should be noted that these techniques were very time-consuming, and their accuracy relative to the design assumptions was limited
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