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Sensors 2012, 12(12), 16228-16249; doi:10.3390/s121216228

Track Detection in Railway Sidings Based on MEMS Gyroscope Sensors

1,* , 1, 1, 2
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Received: 12 September 2012 / Revised: 9 November 2012 / Accepted: 13 November 2012 / Published: 23 November 2012
(This article belongs to the Section Physical Sensors)
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The paper presents a two-step technique for real-time track detection in single-track railway sidings using low-cost MEMS gyroscopes. The objective is to reliably know the path the train has taken in a switch, diverted or main road, immediately after the train head leaves the switch. The signal delivered by the gyroscope is first processed by an adaptive low-pass filter that rejects noise and converts the temporal turn rate data in degree/second units into spatial turn rate data in degree/meter. The conversion is based on the travelled distance taken from odometer data. The filter is implemented to achieve a speed-dependent cut-off frequency to maximize the signal-to-noise ratio. Although direct comparison of the filtered turn rate signal with a predetermined threshold is possible, the paper shows that better detection performance can be achieved by processing the turn rate signal with a filter matched to the rail switch curvature parameters. Implementation aspects of the track detector have been optimized for real-time operation. The detector has been tested with both simulated data and real data acquired in railway campaigns.
Keywords: track detection; MEMS gyroscope; adaptive matched filtering; railway navigation track detection; MEMS gyroscope; adaptive matched filtering; railway navigation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Broquetas, A.; Comerón, A.; Gelonch, A.; Fuertes, J.M.; Castro, J.A.; Felip, D.; López, M.A.; Pulido, J.A. Track Detection in Railway Sidings Based on MEMS Gyroscope Sensors. Sensors 2012, 12, 16228-16249.

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