Wireless train proximity alert system
August 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3758775 System for establishing a communication link between a ground station and each of vehicle drivers within a limited communication area Driver alert system Communicating vital control signals Method and apparatus for processing data in a GPS receiving device in a road vehicle Railroad grade crossing motorist warning system Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment Rail vehicle positioning system Vehicle locating and communicating method and apparatus Emergency vehicle alert system InventorsAssigneeApplicationNo. 283460 filed on 08/01/1994US Classes:340/903, Relative distence between vehicles (e.g., collision alert)246/5, Selective246/7, Train telegraphy or telephony246/122R, TRAIN-POSITION INDICATION246/293, Highway crossing340/901, EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM340/902, Transmitter in another vehicle (e.g., emergency vehicle)340/989, At remote location340/994Vehicle's arrival or expected arrival at remote location along route indicated at that remote location (e.g., bus arrival systems)ExaminersPrimary: Swarthout, Brent A.Assistant: Mannava, Ashok Attorney, Agent or FirmInternational ClassG08G 001/16AbstractA 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.Other References
Field of SearchEXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARMTransmitter in another vehicle (e.g., emergency vehicle) Relative distence between vehicles (e.g., collision alert) Transmitter in one vehicle only VEHICLE DETECTORS Vehicle's arrival or expected arrival at remote location along route indicated at that remote location (e.g., bus arrival systems) At remote location Selective Train telegraphy or telephony TRAIN-POSITION INDICATION Train annunciators or indicators VEHICLE-ENERGY ACTUATION Highway crossing | |
