Communications: electrical – Land vehicle alarms or indicators – Of relative distance from an obstacle
Reexamination Certificate
2005-07-12
2005-07-12
Tweel, Jr., John (Department: 2636)
Communications: electrical
Land vehicle alarms or indicators
Of relative distance from an obstacle
C340S903000, C340S904000, C375S130000
Reexamination Certificate
active
06917284
ABSTRACT:
A railroad collision avoidance system and method are disclosed that utilize impulse radio technology to effectively warn a person when there is a locomotive in their vicinity. In one embodiment, the railroad collision avoidance system includes a transmitting impulse radio unit coupled to a locomotive and a receiving impulse radio unit coupled to a vehicle. The transmitting impulse radio unit operates to transmit an impulse radio signal towards the vehicle when the locomotive is a predetermined distance from a railroad crossing. Upon receiving the impulse radio signal, the receiving impulse radio unit makes sure the person operating the vehicle is informed about the potentially dangerous situation. Several embodiments of the railroad collision avoidance system and method are disclosed all of which operate to warn a person when there is a locomotive in their vicinity.
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Grisham William T.
Roberts Mark D.
Time Domain Corp.
Tucker William J.
Tweel , Jr. John
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