Vehicle identification
First Claim
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1. A method of vehicle identification, comprising:
- sensing a change in at least two components of a magnetic field at a first location due to movement of a vehicle and producing an event record that includes a vehicle magnetic signature corresponding to the change;
comparing the vehicle magnetic signature to a database of saved records that include stored magnetic signatures;
associating the event record with a saved record in the database when a match is obtained between the vehicle magnetic signature and the stored magnetic signature of the saved record; and
performing an action when the match is obtained between the vehicle magnetic signature and the stored magnetic signature;
wherein the first location is at a road and the stored magnetic signatures are generated by sensing a change in a magnetic field in at least two components at a second location due to movement of vehicles along the road at the second location, the second location being a location past which vehicles travel before reaching the first location.
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Abstract
Magnetometers under the road surface detect variations in the vertical and longitudinal horizontal components of the magnetic field over time in response to passing vehicles. A trajectory of these components in the phase space of these field components is regularized to obtain a magnetic signature. Magnetic signatures are compared using cross-correlation over arc length to identify vehicles. Inductance sensors can be used to detect vehicles and help determine the beginning and end of magnetic signatures.
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Citations
26 Claims
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1. A method of vehicle identification, comprising:
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sensing a change in at least two components of a magnetic field at a first location due to movement of a vehicle and producing an event record that includes a vehicle magnetic signature corresponding to the change; comparing the vehicle magnetic signature to a database of saved records that include stored magnetic signatures; associating the event record with a saved record in the database when a match is obtained between the vehicle magnetic signature and the stored magnetic signature of the saved record; and performing an action when the match is obtained between the vehicle magnetic signature and the stored magnetic signature; wherein the first location is at a road and the stored magnetic signatures are generated by sensing a change in a magnetic field in at least two components at a second location due to movement of vehicles along the road at the second location, the second location being a location past which vehicles travel before reaching the first location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of vehicle identification, comprising:
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sensing a change in at least two components of a magnetic field at a first location due to movement of a vehicle and producing an event record that includes a vehicle magnetic signature corresponding to the change; comparing the vehicle magnetic signature to a database of saved records that include stored magnetic signatures; associating the event record with a saved record in the database when a match is obtained between the vehicle magnetic signature and the stored magnetic signature of the saved record; and performing an action when the match is obtained between the vehicle magnetic signature and the stored magnetic signature; wherein comparing comprises a cross-correlation performed on a constructed time and process independent measure, and the match is determined by the cross-correlation exceeding a pre-defined threshold.
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Specification