US 12,311,990 B2
Grade crossing control system and method for determining track circuit impedance
Brian Joseph Hogan, Temecula, CA (US)
Assigned to SIEMENS MOBILITY, INC., New York, NY (US)
Filed by Siemens Mobility, Inc., New York, NY (US)
Filed on Apr. 7, 2022, as Appl. No. 17/658,305.
Prior Publication US 2023/0322283 A1, Oct. 12, 2023
Int. Cl. B61L 29/30 (2006.01); B61L 29/28 (2006.01)
CPC B61L 29/30 (2013.01) [B61L 29/284 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A grade crossing control system comprising:
a track transmitter configured to couple to rails of a railroad track, and
a track receiver configured to couple to the rails of the railroad track,
wherein the track transmitter comprises a signal source and an amplifier, and is configured to generate and transmit a first signal to the rails utilizing the signal source and the amplifier,
wherein the track receiver is configured to measure a voltage value produced in response to the first signal at the rails,
wherein the track transmitter is configured to provide feedback measurement information of the first signal, and
wherein the signal source comprises a current source and the feedback measurement information of the first signal is an actual current value at a specific frequency.