Bulletin des sciences géographiques de l'INCT
Volume 25, Numéro 1, Pages 9-18
2021-10-31
Performance Investigation And Accuracy Assessment Of Using An Aided Ins Trolley For Railway Track Surveying
Authors : Bouchiba Mohammed .
Abstract
The rapid development of China's highspeed railway shows that new efficient and accurate means are required to overcome the problem of rail track maintenance, precisely the difficulty in the stage of measuring the track irregularities. One such mean is the method that involves the use of track measuring trolley based on aided inertial navigation system (INS) with INS/ Total station configuration, which can measure the track geometry parameters in a non-contact manner by running on the track. The aims of this research were to validate the method that involves the use of the new track inspection trolley based on aided INS and total station measurements instead of global navigation satellite system (GNSS) measurements, by investigating the performance of using the cited trolley in real tests on the rail track, and assessing the inner accuracy through measurement repeatability analysis, and assessing the outer accuracy via comparison of the results with those related to the traditional trolley Amberg GRP 1000. The field tests results indicated that : 1).The investigated method based on aided INS is reliable and itstrack irregularities measurement repeatability of track gauge, super-elevation, horizontal and vertical deviation of track axisis smaller than 0.2 mm (1σ). 2).Both the trolley based on aided INS and the Amberg GRP 1000 meet the static accuracy requirement for railway track irregularity measurement defined in Chinese standards.3).The method based on aided INS can be used alternatively with the Amberg GRP 1000, and even can replace it due to the high measurement accuracy achieved in optimized measuring time (faster about 16-20 times than the traditional trolley). 4).It is easy to obtain where the track irregularities are because deviations are directly related to their mileage value, and therefore we can locate it on the railway track.
Keywords
Track measuring trolley, aided INS, track geometry parameters, railway track irregularity, relative and absolute accuracies.
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