Wireless tracking system and method utilizing tags with variable power level transmissions
First Claim
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1. A method for determining a real-time location of an object within an indoor facility, the method comprising:
- obtaining a first plurality of sensor readings from a tag attached to the object, each of the first plurality of sensor readings transmitted from the tag at a first energy level;
obtaining a second plurality of sensor readings from the tag attached to the object, each of the second plurality of sensor readings transmitted from the tag at a second energy level, the second energy level different from the first energy level;
obtaining a third plurality of sensor readings from the tag attached to the object, each of the third plurality of sensor readings transmitted from the tag at a third energy level, the third energy level different from the second energy level and the first energy level;
sorting each of the first, second and third sensor readings by a plurality of physical regions;
selecting a first physical region of the plurality of physical regions for each of the first, second and third energy levels, the first physical region composed of a primary plurality of sensor readings having the highest average signal strength for each of the first, second and third energy levels;
sorting the primary plurality of sensor readings into a secondary plurality of sensor readings for each of the first, second and third energy levels, each of the secondary plurality of sensor readings corresponding to a zone within the first physical region;
selecting a selected zone having the highest average reading for each of the first, second and third energy levels;
calculating a real-time location of the object from a plurality of the highest sensor readings from the secondary plurality of sensor readings corresponding to the selected zone for each of the first, second and third energy levels; and
comparing each of the real-time locations for each of the first, second and third energy levels to determine a true real-time location of the object.
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Abstract
The present invention provides a solution to mistaken location calculations based on multipath effects. The present invention utilizes tags attached to objects that transmit signals at various power levels for reception by sensors stationed throughout a facility. Sensor readings at the various power levels are utilized to determine the location of the tagged object.
26 Citations
1 Claim
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1. A method for determining a real-time location of an object within an indoor facility, the method comprising:
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obtaining a first plurality of sensor readings from a tag attached to the object, each of the first plurality of sensor readings transmitted from the tag at a first energy level; obtaining a second plurality of sensor readings from the tag attached to the object, each of the second plurality of sensor readings transmitted from the tag at a second energy level, the second energy level different from the first energy level; obtaining a third plurality of sensor readings from the tag attached to the object, each of the third plurality of sensor readings transmitted from the tag at a third energy level, the third energy level different from the second energy level and the first energy level; sorting each of the first, second and third sensor readings by a plurality of physical regions; selecting a first physical region of the plurality of physical regions for each of the first, second and third energy levels, the first physical region composed of a primary plurality of sensor readings having the highest average signal strength for each of the first, second and third energy levels; sorting the primary plurality of sensor readings into a secondary plurality of sensor readings for each of the first, second and third energy levels, each of the secondary plurality of sensor readings corresponding to a zone within the first physical region; selecting a selected zone having the highest average reading for each of the first, second and third energy levels; calculating a real-time location of the object from a plurality of the highest sensor readings from the secondary plurality of sensor readings corresponding to the selected zone for each of the first, second and third energy levels; and comparing each of the real-time locations for each of the first, second and third energy levels to determine a true real-time location of the object.
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Specification
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Current AssigneeCentrak Incorporated (Halma PLC)
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Original AssigneeAwarepoint Corporation
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InventorsCaliri, Dyami, Nierenberg, Nicolas C
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Primary Examiner(s)Holloway, III; Edwin C
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Application NumberUS12/116,221Publication NumberTime in Patent Office314 DaysField of Search340/10.1, 340/10.3, 340/10.4, 340/825.49, 340/539.13, 340/572.1, 342/357.01, 342/463, 342/465, 455/456.1, 455/67.11US Class Current340/10.3CPC Class CodesG08C 21/00 Systems for transmitting th...
