SYSTEMS AND METHODS FOR OBJECT LOCALIZATION AND PATH IDENTIFICATION BASED ON RFID SENSING
First Claim
1. A radio frequency identification (RFID) system for localizing an RFID tag, the system comprising:
- a plurality of radio frequency identification (RFID) tag readers;
at least one sensing entity;
a computer in signal communication with the plurality of RFID tag readers and at least one sensing entity over a network;
a memory associated with the computer, the memory storing a network model having a plurality of endpoints and oriented links between the endpoints, wherein the endpoints are associated with physical locations in space, each of the endpoints having associated with it one or more radio frequency identification (RFID) tag readers;
the computer being configured to operate a software module that localizes the RFID tag based on data received from the RFID tag readers;
the software module further being configured to associate a semantic attribute the RFID tag by;
mapping one of the oriented links to a source endpoint at a first physical location and a destination endpoint at a second physical location;
determining that the RFID tag is present at the source endpoint at a first time value and that the RFID tag is present at the destination endpoint at a second time value;
determining that the RFID tag has traversed the oriented link from the source endpoint to arrive at the destination endpoint, including a path of travel and a direction assigned to the oriented link;
determining that a parameter from at least one sensing entity sampled between the first time value and the second time value is within a predetermined measurement interval; and
associating the semantic attribute to the RFID tag based on the determination that the RFID tag has traversed the oriented link and the determined parameter.
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Abstract
A networked radio frequency identification system includes a plurality of radio frequency identification (RFID) tag readers, a computer in signal communication with the RFID tag readers over a network, and a software module for storage on and operable by the computer that localizes RFID tags based on information received from the RFID tag readers using a network model having endpoints and oriented links. In an additional example, at least one of the RFID tag readers includes an adjustable configuration setting selected from RF signal strength, antenna gain, antenna polarization, and antenna orientation. In a further aspect, the system localizes RFID tags based on hierarchical threshold limit calculations. In an additional aspect, the system controls a locking device associated with an access point based on localization of an authorized RFID tag at the access point and reception of additional authorizing information from an input device.
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Citations
20 Claims
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1. A radio frequency identification (RFID) system for localizing an RFID tag, the system comprising:
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a plurality of radio frequency identification (RFID) tag readers; at least one sensing entity; a computer in signal communication with the plurality of RFID tag readers and at least one sensing entity over a network; a memory associated with the computer, the memory storing a network model having a plurality of endpoints and oriented links between the endpoints, wherein the endpoints are associated with physical locations in space, each of the endpoints having associated with it one or more radio frequency identification (RFID) tag readers; the computer being configured to operate a software module that localizes the RFID tag based on data received from the RFID tag readers; the software module further being configured to associate a semantic attribute the RFID tag by; mapping one of the oriented links to a source endpoint at a first physical location and a destination endpoint at a second physical location; determining that the RFID tag is present at the source endpoint at a first time value and that the RFID tag is present at the destination endpoint at a second time value; determining that the RFID tag has traversed the oriented link from the source endpoint to arrive at the destination endpoint, including a path of travel and a direction assigned to the oriented link; determining that a parameter from at least one sensing entity sampled between the first time value and the second time value is within a predetermined measurement interval; and associating the semantic attribute to the RFID tag based on the determination that the RFID tag has traversed the oriented link and the determined parameter. - View Dependent Claims (2, 3, 4)
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5. A radio frequency identification (RFID) system for localizing at least two RFID tags, the system comprising:
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a plurality of radio frequency identification (RFID) tag readers; a computer in signal communication with the plurality of RFID tag readers over a network; a memory associated with the computer, the memory storing a network model having a plurality of endpoints and oriented links between the endpoints, wherein the endpoints are associated with physical locations in space, each of the endpoints having associated with it one or more radio frequency identification (RFID) tag readers; the computer being configured to operate a software module that localizes the RFID tag based on data received from the RFID tag readers; the software module further being configured to associate a group dependent semantic attribute to at least one of the RFID tags by; determining that the first RFID tag passed an oriented link at a first time value; determining that the second RFID tag passed the oriented link at a second time value; and defining a semantic group by associating a group dependent semantic attribute to at least one of the RFID tags based on a semantic attribute associated with the oriented link. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A radio frequency identification (RFID) system for localizing at least two RFID tags, the system comprising:
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a plurality of radio frequency identification (RFID) tag readers; at least one sensor, the sensor being configured to detect a parameter other than a location or presence of the RFID tags; a computer in signal communication with the plurality of RFID tag readers and at least one sensing entity over a network; a memory associated with the computer, the memory storing a network model having a plurality of endpoints and oriented links between the endpoints, wherein the endpoints are associated with physical locations in space, each of the endpoints having associated with it one or more radio frequency identification (RFID) tag readers; the computer being configured to operate a software module that localizes the RFID tag based on data received from the RFID tag readers; the software module further being configured to associate a group semantic attribute with at least one of the RFID tags by; determining that the first RFID tag is present at a first endpoint at a first time value and that the second RFID tag is present at the first endpoint at a second time value; receiving a measurement from a sensor associated with the first endpoint between the first time and the second time value; and forming a semantic group by associating the group semantic attribute to at least one of the RFID tags as a function of the sensor measurement and the determined presence of the first RFID tag and the second RFID tag. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification