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System and method for determining a velocity and a direction of travel of a vehicle on a roadway

  • US 20060284764A1
  • Filed: 06/16/2005
  • Published: 12/21/2006
  • Est. Priority Date: 06/16/2005
  • Status: Active Grant
First Claim
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1. A method for determining a velocity and a direction of travel of a vehicle on a roadway, comprising:

  • selecting a portion of the roadway;

    determining a cellular phone base station that is within a desired distance from the portion of the roadway, from a plurality of cellular phone base stations;

    inducing the cellular phone base station to transmit a first message to a first GPS transceiver unit disposed in a first vehicle, the first vehicle being disposed on the portion of the roadway, the first message requesting a first position coordinate from the first GPS transceiver unit;

    receiving a second message from the first GPS transceiver unit having the first position coordinate and a first time value;

    inducing the cellular phone base station to transmit a third message to the first GPS transceiver unit, the third message requesting a second position coordinate of the first GPS transceiver unit;

    receiving a fourth message from the first GPS transceiver unit having the second position coordinate and a second time value; and

    determining a velocity and a direction of travel of the first vehicle based on the first and second position coordinates and the first and second time values.

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