Detection system for determining positional information about objects
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Aug 2, 1999
filing date -
Dec 4, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system which enables the position of each plurality of mobile labelled objects in a specified environment to be determined from the transit times to fixed receivers of ultrasound energy transmitted by object mounted transponders which are triggered by radio energy, wherein the specified environment is divided into cells each have a radio transmitter transmitting the radio triggered signals, these radio transmissions being multiplexed in accordance with identifying characteristics of the respective cells, no two cells with the same identifying characteristics overlapping one another.
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