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US 8,525,510 B2Granted
Railway positioning system
AssigneeBombardier Transportation GmbH
InventorsAskell Finnestad, Hakan Lind, Carsten Hasberg, Stefan Hensel, René Rütters
Life of this patent
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AssigneeBombardier Transportation GmbH
InventorsAskell Finnestad, Hakan Lind, Carsten Hasberg, Stefan Hensel, René Rütters
Estimating the term…
A railway positioning system provides an on-board speed measurement device (6) inducing eddy currents in the wayside structure at two spots along the travelling direction, measuring the variations of the magnetic field emitted by the wayside structure and determining position and speed by correlating the 2 measured signals known from U.S. Pat. No. 5,825,177 and a wayside coded tag (1) providing a coding recognizable by the onboard speed measurement device (6). The coded tag (1) consists of a bar (4) with several slots (3) in which metal blocks (2) of different sizes are mounted. The block sizes and positions are selected to represent a coding according to Quadrature Amplitude Modulation.
A railway positioning system comprising:
A wayside coded tag for coding recognisable by an on-board speed measurement device of a rail vehicle, the coded tag comprising electrically conducting blocks of different sizes representing an amplitude of a Quadrature Amplitude Modulation, wherein the blocks are mounted at the coded tag parallel to the railway vehicle's travelling direction at positions representing the Quadrature Amplitude Modulation's phase shift.
A method of determining position and speed of a rail vehicle using an on-board speed measurement device, said method comprising the steps of inducing eddy currents in a wayside structure at two spots along a travelling direction, measuring variations of a magnetic field emitted by the wayside structure, and determining position and speed by correlating the two measured signals, wherein
Dependencies are inferred from the claim text.