US 11,774,573 B2
System and method to determine low-speed and stationary state of a rail vehicle
Adam Le, Toronto (CA); Tyler Daoust, Toronto (CA); David Beach, Toronto (CA); and Alon Green, Toronto (CA)
Assigned to THALES CANADA INC., Toronto (CA)
Filed by THALES CANADA INC., Toronto (CA)
Filed on Oct. 9, 2020, as Appl. No. 17/66,946.
Claims priority of provisional application 62/913,517, filed on Oct. 10, 2019.
Prior Publication US 2021/0109207 A1, Apr. 15, 2021
Int. Cl. G01S 13/60 (2006.01); G01S 13/86 (2006.01); B61L 25/02 (2006.01)
CPC G01S 13/60 (2013.01) [B61L 25/021 (2013.01); G01S 13/86 (2013.01)] 20 Claims
OG exemplary drawing
 
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.