REAL-TIME VEHICLE POSITION DETERMINATION USING COMMUNICATIONS WITH VARIABLE LATENCY

  • US 20090231161A1
  • Filed: 03/05/2009
  • Published: 09/17/2009
  • Est. Priority Date: 03/11/2008
  • Status: Active Grant
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First Claim
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1. A method for tracking a vehicle in an electronic toll collection (ETC) system, the vehicle having a transponder configured to communicate with a roadside processor using a wide area RF communications protocol when in a coverage area of the system, the coverage area including a section of a multilane roadway through which vehicles travel, the method comprising:

  • receiving at least one RF signal from the transponder, the at least one RF signal containing position data and a recorded time, wherein the recorded time is a time at which the position data was recorded by the transponder; and

    predicting the position of the vehicle at a future time based on the position data and the recorded time.

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