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Real-time vehicle position determination using communications with variable latency

  • US 8,384,560 B2
  • Filed: 03/05/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 03/11/2008
  • Status: Active Grant
First Claim
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1. A method for tracking a vehicle in a toll area of an electronic toll collection (ETC) system, the vehicle having a transponder to communicate with a roadside processor using a wide area radio frequency (RF) communications protocol when in a coverage area of the system, the coverage area including a section of a multilane roadway in the toll area through which vehicles travel, the method comprising:

  • receiving at least one RF signal from the transponder, the at least one RF signal comprising position data and a recorded time, wherein the recorded time is a time at which the position data was recorded by the transponder, and wherein the position data comprises data regarding the vehicle'"'"'s position in the toll area; and

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

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