Positioning with RF-ID transponders
AssigneeTexas Instruments Incorporated
InventorsAndreas Hagl, Horst Mollik, Kostantin Aslanidis
Life of this patent
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Abstract
A method of determining the exact location of a transponder with respect to a reader antenna, with no additional components to the existing system required, is disclosed. An existing pin of the reader IC, the RSTP pin, provides an analog fieldstrength signal from which the distance to the reader antenna is deduced via known in the art signal processing methods. A grid or even an exact position location along a route is also achievable with initial set-up of at least two transponders a predetermined distance apart and a reader antenna.
Claims4
A method of determining the exact location of a transponder with respect to a reader, having an antenna and an IC, comprising the steps of:
- providing a test pin on said IC with an analog fieldstrength signal representative of the distance between a transponder and a reader antenna, wherein said IC also comprises control and identification information;
- and
- calculating the distance between a transponder and a reader antenna from said analog fieldstrength signal.
Dependencies are inferred from the claim text.