Methods and systems for determining vehicle position in an automatic vehicle identification system
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United States of America Patent
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May 16, 2017
Grant Date -
Feb 26, 2015
app pub date -
Aug 11, 2014
filing date -
Aug 26, 2013
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Abstract
Methods of estimating vehicle location in a roadway using an automatic vehicle identification system are described. The methods involve receiving a set of response signals from a vehicle-mounted transponder at points in time and determining a range rate of the transponder relative to the antenna at each point in time; identifying a minima in the magnitude of the range rate; estimating a first position of the transponder at a first time corresponding to the occurrence of the minima; estimating a velocity of the vehicle based upon one or more of the determined range rates; and estimating a second position of the transponder based upon the first position and the velocity.
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