CPC G01S 13/60 (2013.01) [B61L 25/021 (2013.01); G01S 13/86 (2013.01)] | 20 Claims |
1. A system for determining a stationary state of a rail vehicle on a track, comprising:
a first radar mounted at an end of the rail vehicle, wherein the first radar measures a first velocity of the rail vehicle;
a second radar mounted at another end of the rail vehicle, wherein the second radar measures a second velocity of the rail vehicle;
a wheel mounted speed sensor mounted on the rail vehicle, wherein the wheel mounted sensor measures a third velocity of the rail vehicle;
a series of fixed reflective track features along the track; and
a processing unit, communicably connected with the speed sensor, the first radar and the second radar;
wherein the processing unit is configured to receive data from the first radar corresponding to a first distance to one of the fixed reflective track features to determine a first displacement and to receive data from the second radar corresponding to a second distance to another one of the fixed reflective track features to determine a second displacement;
and wherein the processing unit is configured to determine the rail vehicle is in a stationary state responsive to the first velocity, and the second velocity and third velocity being less than a predetermined threshold velocity and the first displacement and the second displacement being less than a predetermined threshold displacement.
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