Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle
Patent
1994-08-01
1996-09-10
Swarthout, Brent A.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Transmitter in another vehicle
340901, 340902, 340989, 340994, 246 5, 246 7, 246122R, 246293, G08G 116
Patent
active
055549829
ABSTRACT:
A wireless train proximity alert system provides a constant warning signal to warn vehicles approaching a train crossing when a train is also approaching the crossing. The system includes a transceiver, positioned on the train itself or at the side of the track, for transmitting a train proximity signal, which preferably includes the train's speed and position. A crossing-based transceiver receives the train's proximity signal and transmits the boundary coordinates of a warning zone when the train's estimated time-to-arrival at the crossing is within a predetermined range. A vehicle-based receiver receives the warning zone signal and the crossing's position, compares them to the vehicle's position and speed, and produces an alarm to the vehicle's operator when a potential accident is indicated.
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Casella Bruce A.
Shirkey Keith L.
Denson-Low Wanda K.
Hughes Aircraft Co.
Mannava Ashok
Swarthout Brent A.
Walder Jeanette M.
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