Localizing tagged assets in a configurable monitoring device system

• US 9,449,202 B2
• Filed: 09/10/2010
• Issued: 09/20/2016
• Est. Priority Date: 10/02/2009
• Status: Active Grant

• Current Assignee: CHECKPOINT SYSTEMS, INC. (CCL Industries Incorporated)
• Original Assignee: CHECKPOINT SYSTEMS, INC. (CCL Industries Incorporated)
• Inventors: Clare, Thomas J., Krishnamurthy, Venkat
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): SAMSON, SARA B
• Application Number:
  US12/879,049
• Publication Number:
  US 20110080264A1
• Time in Patent Office: 2,202 Days
• Field of Search: 340/1.1, 340/10.1
• US Class Current: 1/1
• CPC Class Codes: G01S 13/82 wherein continuous-type signals are transmitted
• CPC Class Codes: G01S 2013/466 by Trilateration, i.e. two antennas or two sensors determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the antennas or sensors, the position data of the target is determined
• CPC Class Codes: G01S 2013/468 by Triangulation, i.e. two antennas or two sensors determine separately the bearing, direction or angle to a target, whereby with the knowledge of the baseline length, the position data of the target is determined
• CPC Class Codes: G01S 7/4004 of parts of a radar system
• CPC Class Codes: G01S 7/4052 by simulation of echoes
• CPC Class Codes: G01S 7/4056 specially adapted to FMCW
• CPC Class Codes: G01S 7/52004 Means for monitoring or calibrating short-range imaging G01S7/5205
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/0095 Testing the sensing arrangement, e.g. testing if a magnetic card reader, bar code reader, RFID interrogator or smart card reader functions properly testing of electrical circuits G01R31/28
• CPC Class Codes: G06K 7/10099 the directional field being used for pinpointing the location of the record carrier, e.g. for finding or locating an RFID tag amongst a plurality of RFID tags, each RFID tag being associated with an object, e.g. for physically locating the RFID tagged object in a warehouse
• CPC Class Codes: G06K 7/10217 parameter settings controlling the transmission power of the interrogator
• CPC Class Codes: G06K 7/10356 using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
• CPC Class Codes: G06K 7/10475 arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices
• CPC Class Codes: G08B 13/2442 Tag materials and material properties thereof, e.g. magnetic material details
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04Q 2213/13095 PIN / Access code, authentication
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a tag communication system, a method includes determining range information representative of a distance between two tags, and estimating parameter information representative of backscatter signals of a marker tag and an asset tag. A tag is localized according to the range information and the parameter information to provide a localized tag. The range information is determined according to a beacon signal. The system includes a plurality of beacon signals and the method further includes determining the range information according to at least two of the beacon signals. A logical operation is performed on the range information of the two beacon signals. A further beacon signal has a plurality of signal ranges and the range information is determined according to the signal ranges. A logical operation is performed on the range information of the signal ranges.

Claims

1. A method, comprising:

providing a plurality of configurable monitoring devices (CMDs) comprising a first CMD, a first set of CMDs, and a second set of CMDs, wherein each CMD of the plurality of CMDs is capable of being configured as an information gathering node, an asset tag, a marker tag, and a beacon;

initially configuring the first CMD, via a monitoring system manager, as an information gathering node in response to wireless communications received from the first CMD;

initially configuring the first set of CMDs, via the monitoring system manager, as asset tags in response to wireless communications received from the first set of CMDS, the asset tags including a first asset tag configured to communicate with a second asset tag neighboring the first asset tag;

initially configuring the second set of CMDs, via the monitoring system manager, as marker tags in response to wireless communications received from the second set of CMDs, the marker tags including a first marker tag configured to communicate with a second marker tag neighboring the first marker tag,

determining a range between two of the CMDs of the plurality of CMDs based on a communication between the two CMDs;

estimating a parameter from modulated backscatter signals of the first marker tag and the first asset tag;

localizing the first asset tag in accordance with said range and the estimated parameter, and

dynamically reconfiguring, via the monitoring system manager, at least one of the plurality of CMDs to operate as a different one of the information gathering node, the asset tag, the marker tag, or the beacon relative to a previous configuration of the at least one of the plurality of CMDs in response to wireless communications received from at least one of the plurality of CMDs.

2. The method of claim 1, further comprising:

configuring another CMD, via the monitoring system manager, as a beacon for generating a beacon signal based on wireless communications received from the another CMD;

wherein said step of determining the range further comprises determining said range in accordance with said beacon signal.

3. The method of claim 2, further comprising:

configuring a first subset of CMDs, via the monitoring system manager, as beacons for generating respective beacon signals based on wireless communications received from the another CMD, wherein said step of determining the range comprises determining said range in accordance with said respective beacon signals.

4. The method of claim 1 wherein each of the CMDs comprises (i) a processor with instructions for performing a plurality of differing node functions and (ii) a configuration manager communicating with the processor to perform a selected node function of the plurality of differing node functions.

5. The method of claim 2, wherein a further beacon signal has a plurality of signal ranges, wherein the step of determining said range comprises determining said range in accordance with the plurality of signal ranges.

6. The method of claim 1, wherein the estimated parameter comprises antenna array response information, time of flight information, signal strength information, or signal to noise information.

7. The method of claim 1, further comprising arranging said plurality of CMDs in a mesh and wherein said mesh communicates said range to the information gathering node.

8. The method of claim 1, further comprising scanning an electromagnetic signal across a zone including the localized tag using a transmit beamforming array node or scanning using a receive beamforming array node with a plurality of antennas configured to receive the modulated backscatter signals from the localized tag.

9. The method of claim 8 wherein at least one of the receive beamforming array node and the transmit beamforming array node comprises a CMD having (i) a processor with instructions for performing a plurality of differing node functions and (ii) a configuration manager communicating with the processor to perform a selected node function of the plurality of differing node functions.

10. The method of claim 1, further comprising providing a commission signal, via the monitoring system manager, to each one of the first set of CMDs in response to initially configuring the first set of CMDs as assets tags.

11. A tag communication system, comprising:

a monitoring system manager for interfacing with a plurality of configurable monitoring devices (CMDs) to provide initial configuration information and dynamic reconfiguration information to the plurality of CMDs based on wireless communication received from each one of the plurality of CMDs;

the plurality of CMDs comprising a first CMD, a first set of CMDs, and a second set of CMDs, wherein each CMD of the plurality of CMDs is capable of being configured as an information gathering node, an asset tag, a marker tag, and a beacon;

the first CMD initially being configured as an information gathering node;

the first set of CMDs initially being configured as assets tags, the asset tags including a first asset tag configured to communicate with a second asset tag neighboring the first asset tag;

the second set of CMDs initially being configured as marker tags, the marker tags including a first marker tag configured to communicate with a second marker tag neighboring the first marker tag;

a reader comprising a transmitter beamforming system for transmitting a transmit beam through a region where said plurality of CMDs are located; and

a location module, in communication with said reader, said location module;

determining a range between two of CMDs of the plurality of CMDs based on communication between the two CMDs;

estimating a parameter, by said reader, from modulated backscatter signals of the first marker tag and of the first asset tag; and

localizing the first asset tag in accordance with said range and the estimated parameter.

12. The system of claim 11, wherein said range and the parameter are represented by backscatter signals from two different sources of electromagnetic signals.

13. The system of claim 11, further comprising an information gathering node that stores said range.

14. The system of claim 13, further comprising a gateway node that communicates said range to said information gathering node.

15. The system of claim 13, wherein the plurality of CMDs are arranged in a mesh, and wherein said mesh communicates said range to the information gathering node.

16. The system of claim 15, wherein the mesh includes at least two tags with tag to tag communication, and communicates said range to the information gathering node by way of the tag to tag communication within the mesh.

17. The system of claim 13, further comprising a network activity node that communicates said range to the information gathering node.

18. The system of claim 11, wherein a beacon signal is provided by a CMD configured as a beacon.

19. The system of claim 11, a CMD is configured as a calibration node in a beamforming feedback loop.

20. The system of claim 11 wherein said estimated parameter comprises antenna array response information, time of flight, signal strength, signal to noise information, or angle information of an angle of arrival of the modulated backscatter signals.

21. The system of claim 11 wherein each CMD comprises (i) a processor with instructions for performing a plurality of differing node functions and (ii) a configuration manager communicating with the processor to perform selected node function of the plurality of differing node functions.

22. The system of claim 11, wherein in response to the first set of CMDs being initially configured as assets tags, the monitoring system manager is further configured to interface with the first set of CMDs to provide a commission signal to each one of the first set of CMDs.