System and method for determining a velocity and a direction...

Details System and method for determining a velocity and a direction... System and method for determining a velocity and a direction...

2007-02-20

2007-02-20

Phan, Dao L. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490, C342S357490, C701S213000

Reexamination Certificate

active

11154005

ABSTRACT:
A system and a method for determining a velocity and a direction of travel of a vehicle on a roadway are provided. The method includes selecting a portion of the roadway and 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. The method further includes inducing a cellular phone base station to transmit a first message to a first global positioning system transceiver unit disposed in a first vehicle. The first message requests a first position coordinate from the first GPS transceiver unit. The method further includes receiving a second message from the first GPS transceiver unit having the first position coordinate and a first time value, and inducing the cellular phone base station to transmit a third message to the first GPS transceiver unit. The third message requests a second position coordinate of the first GPS transceiver unit. The method further includes 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.

REFERENCES:
patent: 5907293 (1999-05-01), Tognazzini
patent: 6810321 (2004-10-01), Cook
patent: 2004/0227661 (2004-11-01), Godsy

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