CPC B61L 3/02 (2013.01) [B61L 3/008 (2013.01); B61L 3/125 (2013.01); B61L 9/00 (2013.01); B61L 15/0027 (2013.01); B61L 25/021 (2013.01); B61L 25/025 (2013.01); B61L 23/041 (2013.01); B61L 2201/00 (2013.01); B61L 2205/00 (2013.01); B61L 2207/00 (2013.01)] | 20 Claims |
1. A signal aspect enforcement method for a rail vehicle with an unknown position comprising:
receiving speed measurements from speed measuring device by an on-board controller;
determining using the received speed measurements if rail vehicle speed is less than a predetermined line-of-sight threshold speed;
receiving grade measurements from a grade measuring device by the on-board controller and determining grade of rail;
determining worst-case braking distance of the rail vehicle using the rail vehicle speed and grade of rail;
receiving image data including a first signal aspect from a camera system and beacon/radio data including a second signal aspect from a beacon/radio system by the on-board controller;
determining if the first signal aspect matches the second signal aspect; and
determining route of rail vehicle and speed limit of rail vehicle by the on-board controller based on the first signal aspect.
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