Positioning with RF-ID transponders
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United States of America Patent
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Apr 15, 1997
Issued Date -
N/A
app pub date -
Jun 20, 1996
filing date -
Oct 4, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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