Abstract
The article discusses an important issue in connection with the technique of mobile Global Navigation Satellite System (GNSS) measurements of railway track coordinates, which is digital filtering performed to precisely determine railway track axes. For this purpose, a measuring technique is proposed which bases on the use of a measuring platform with a number of appropriately distributed GNSS receivers, where two of them determine the directional base vector of the platform. The receivers used in the research had high measuring frequency in the Real Time Kinematic (RTK) operating mode and enabled correction of the obtained results in post–processing. A key problem discussed in the article is the method for assessing the quality of the measurement results obtained from GNSS receivers, and their preparation for further processing making use of geometrically constrained parameters of the base vector and specialized digital filtering, among other elements, to precisely determining the track axis. The obtained results confirm the applicability of the used method of GNSS signal processing.
Highlights
In terms of their shaping, railway tracks have a precisely defined geometric layout which determines the maximum acceptable speed of trains running on them
Generation Global Navigation Satellite System (GNSS) receivers and the network of reference stations Real Time Kinematic (RTK)/Real Time Network (RTN) operating in Poland
One in Selected quality indicators new–generation GNSS receivers and the network of reference stations RTK/RTN operating in Poland
Summary
In terms of their shaping, railway tracks have a precisely defined geometric layout which determines the maximum acceptable speed of trains running on them. Geodetic System–WGS 84), correcting the recorded coordinates of the existing track axis requires determining railway grid directions in the horizontal plane at each measuring point, which can be difficult for points situated on an arc. The developed methods of mobile multi–receiver GNSS measurements outperform the remaining stationary and quasi mobile techniques (i.e., those with a measuring trolley guided manually by the operator) [19,20]) This results from the fact that in this method, the time needed for precise geodetic coupling to physical infrastructure situated along the track is omitted, and the synchronized measuring signals are recorded with a relatively high frequency. It is noteworthy that this is the first application of this type of GNSS data filtering to precisely determine the railway track axis coordinates
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