Method of determining the position of an RFID transponder
First Claim
1. A method of determining the position of an RFID transponder comprising:
- separately emitting at least two electromagnetic alternating fields from at least two antenna to an RFID transponder, wherein the at least two antenna are at a distance from one another so that the two electromagnetic alternating fields are emitted at a distance from one another;
activating reflection properties of an antenna of the RFID transponder;
modifying, after activating the reflection properties, the emitted at least two electromagnetic alternating fields;
reflecting the modified at least two electromagnetic alternating fields to the RFID transponder so that the reflected electromagnetic alternating fields are sent back to the at least two antenna;
determining at least two transit times of the modified at least two electromagnetic alternating fields from the start of emission of each modified electromagnetic alternating field to receiving back each respective modified electromagnetic alternating field;
determining at least two distances between the at least two antenna and the RFID transponder; and
determining the position of the RFID transponder from the at least two distances relative to the at least two antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A method is disclosed for determining the position of an RFID transponder. Separate signals of at least two electromagnetic alternating fields are emitted from at least two antenna to one RFID transponder. The antenna are spaced at a distance from each other so that the two electromagnetic alternating fields are emitted at a distance from one another. The emitted electromagnetic alternating fields to the one RFID transponder are reflected so that the reflected electromagnetic alternating fields are sent back to the antenna. The transit times of the electromagnetic alternating fields are determined from emission to receiving back at the antenna. The distances between the antenna and the RFID transponder are determined, and the position of the RFID transponder from the at least two distances is determined relative to the at least two antenna.
-
Citations
16 Claims
-
1. A method of determining the position of an RFID transponder comprising:
-
separately emitting at least two electromagnetic alternating fields from at least two antenna to an RFID transponder, wherein the at least two antenna are at a distance from one another so that the two electromagnetic alternating fields are emitted at a distance from one another; activating reflection properties of an antenna of the RFID transponder; modifying, after activating the reflection properties, the emitted at least two electromagnetic alternating fields; reflecting the modified at least two electromagnetic alternating fields to the RFID transponder so that the reflected electromagnetic alternating fields are sent back to the at least two antenna; determining at least two transit times of the modified at least two electromagnetic alternating fields from the start of emission of each modified electromagnetic alternating field to receiving back each respective modified electromagnetic alternating field; determining at least two distances between the at least two antenna and the RFID transponder; and determining the position of the RFID transponder from the at least two distances relative to the at least two antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A system with a motor vehicle and an RFID transponder comprising:
-
a vehicle body defining an internal space for accommodating persons enclosed within the vehicle body; at least one drive motor; at least two antenna disposed onboard the motor vehicle; and wherein the system is configured to; separately emit at least two electromagnetic alternating fields from at least two antenna to an RFID transponder, wherein the at least two antenna are at a distance from one another so that the two electromagnetic alternating fields are emitted at a distance from one another; activate reflection properties of an antenna of the RFID transponder; modify, after activating the reflection properties, the emitted at least two electromagnetic alternating fields; reflect the modified at least two electromagnetic alternating fields to the RFID transponder so that the reflected electromagnetic alternating fields are sent back to the at least two antenna; determine at least two transit times of the at least two electromagnetic alternating fields from the emission received back at the at least two antenna from the start of emission of each modified electromagnetic alternating field to receiving back each respective modified electromagnetic alternating field; determine the at least two distances between the at least two antenna and the RFID transponder; and determine the position of the RFID transponder from the at least two distances relative to the at least two antenna. - View Dependent Claims (16)
-
Specification