Detection system for determining positional information about objects
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United States of America Patent
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Oct 22, 2002
Grant Date -
N/A
app pub date -
Jun 22, 1999
filing date -
Dec 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system which enables the position of each of a plurality of movable labelled objects to be determined in an environment having two or more isolated zones, wherein the objects carry transponders which, in response to encoded radio signals, transmit ultrasonic signals of which the transit times to a plurality of fixed receivers are determined, the transponders in the different zones being triggered in a common timeslot but in staggered relationship for one zone as compared to another, and an algorithm is applied to verify the consistency of the transit times having regard to the possible movements of objects from one zone to another.
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