HIGHLY-ACCURATE RADIO LOCATION OF BEACONS IN A WAREHOUSE
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United States of America Patent
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Issued Date -
May 8, 2008
app pub date -
Sep 20, 2007
filing date -
Sep 21, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system for highly accurate radio location of a passive radio beacon coincident with an object to be tracked is disclosed. The beacon directs radio signals to an antenna array located proximate to the warehouse aisles and is positioned such that it receives signals that reflect off the aisle walls grazing angles that are generally less than a maximum, and as such act effectively as mirrors. Ray-tracing techniques may be applied to calculate the response at the antenna array. The multiplicity of reflections may be considered virtual radiating elements setting up a MIMO environment of a plurality of orthogonal modes. Because the location of the beacon is calculated, noise effects can be substantially omitted with an increase in precision of the estimate.
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