Localisation of vehicle or mobile objects based on embedded RFID tags

• US 20070152845A1
• Filed: 12/30/2005
• Published: 07/05/2007
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: Psion Teklogix (Motorola Solutions, Inc.)
• Original Assignee: Psion Teklogix (Motorola Solutions, Inc.)
• Inventors: Bonnefoy, Pierre, Porte, Philippe
• Granted Patent: US 7,609,175 B2
• Time in Patent Office: Days
• US Class Current: 340/933
• CPC Class Codes: E01F 11/00 Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces , e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditionspressure-sensitive elements G01L; traffic control systems G08G
• CPC Class Codes: G08G 1/042 using inductive or magnetic detectors

Abstract

An RFID system for determining the location of a vehicle or mobile object that passes thereover is presented. The system comprises a tag arrangement having at least one tag where the arrangement having a width of between approximately 0.5 m and 2 m.

Claims

1. An RFID system for determining the location of a vehicle that passes thereover, the system comprising a tag arrangement having at least one tag, the arrangement having a width of between approximately 0.5 m and 2 m.

2. The system according to claim 1 wherein the tag arrangement comprises one tag, the tag comprising:

a first antenna for RF communications for the reader, the first antenna being a coil antenna; and

a second antenna having;

a loop having a width approximately equal to the width of the barrier wherein the loop provides RFID coverage over an area defined by the loop; and

a coil providing inductive coupling between the first and second antenna.

3. The system according to claim 2 where the second antenna is rectangular in shape.

4. The system according to claim 2 wherein the coil is the same size as the first antenna.

5. The system according to claim 2 wherein the loop is made from a single wire.

6. The system according to claim 1 wherein the tag arrangement comprises a plurality of tags arranged in the shape of an array.

7. The system according to claim 6 wherein the array has at least two rows.

8. The system according to claim 1 where in the tag arrangement is embedded in a floor.

9. An RFID system for determining the location of a mobile object that passes thereover, the system comprising a tag having:

a first antenna for RF communications for the reader, the first antenna being a coil antenna; and

a second antenna having;

a loop having a width the loop having a width of at least approximately 0.5 m; and

a coil providing inductive coupling between the first and the second antenna.

10. Use of an RFID system for determining the location of a vehicle that passes thereover, the system comprising a tag arrangement having at least one tag, the arrangement having a width of between approximately 0.5 m and 2 m.

11. The use according to claim 10 wherein the tag arrangement has one tag.

12. The use according to claim 10 wherein the tag arrangement has a plurality of tags in the shape of an array.

13. An RFID system for determining the location of a mobile object, the system comprising two or more tag arrangements having at least one tag, the arrangements each defining a barrier over which the mobile object passes, wherein the barrier only detects a vehicle passing over it.

14. An RFID system for determining the location of a mobile object that passes thereover, the system comprising a tag arrangement having at least one tag, the arrangement having a width of between approximately 0.5 m and 2 m.

15. The system according to claim 14 wherein the tag arrangement comprises one tag, the tag comprising:

a first antenna for RF communications for the reader, the first antenna being a coil antenna; and

a second antenna having;

a loop having a width approximately equal to the width of the barrier wherein the loop provides RFID coverage over an area defined by the loop; and

a coil providing inductive coupling between the first and second antenna.