Systems and methods for determining whether a transportation track is occupied
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United States of America Patent
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Mar 22, 2016
Grant Date -
Feb 4, 2010
app pub date -
Jul 31, 2008
filing date -
Jul 31, 2008
priority date (Note) -
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Abstract
A method for determining whether a defined section of a transportation track is occupied is described. The method includes inducing an audio frequency (AF) signal at a first position on the transportation track and receiving the AF signal at a second position on the transportation track. The defined section of the transportation track is located between the first position and the second position on the transportation track. The method further includes measuring a strength of the AF signal received as a function of time at the second position, and identifying an inflection point of the recorded AF signal strength. The inflection point indicates at least one of a rail vehicle entering the defined section of the transportation track and the rail vehicle exiting the defined section of the transportation track. The method further includes determining an occupancy of the defined section of the transportation track, based on the inflection point.
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