System and method for determining a velocity and a direction of travel of a vehicle on a roadway
First Claim
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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Accused Products
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.
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Citations
17 Claims
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1. A method for determining a velocity and a direction of travel of a vehicle on a roadway, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining a velocity and a direction of travel of a vehicle on a roadway, comprising:
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a first computer configured to allow an operator to select a portion of the roadway and to determine 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; and a cellular service provider computer operably communicating with the first computer, the cellular service provider computer configured to induce 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, the cellular phone base station further configured to receive a second message from the first GPS transceiver unit having the first position coordinate and a first time value, the cellular service provider computer further configured to induce the cellular phone base station to transmit a third message to the first GPS transceiver unit, the third message requesting a second position coordinate from the first GPS transceiver unit, the cellular phone base station further configured to receive a fourth message from the first GPS transceiver unit having the second position coordinate and a second time value, the cellular phone base station further configured to communicate the first and second position coordinates and the first and second time values through the cellular service provider computer to the first computer, the first computer further configured to determine 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. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An article of manufacture, comprising:
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a computer storage medium having a computer program encoded therein for determining a velocity and a direction of travel of a vehicle on a roadway, the computer storage medium comprising; code for selecting a portion of the roadway; code for 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; code for 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; code for receiving a second message from the first GPS transceiver unit having the first position coordinate and a first time value; code for 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; code for receiving a fourth message from the first GPS transceiver unit having the second position coordinate and a second time value; and code for 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. - View Dependent Claims (14, 15, 16, 17)
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Specification