A method and apparatus for tracking items automatically is described. A passive RFID (Radio Frequency IDentification) tag is used with a material tracking system capable of real-time pinpoint location and identification of thousands of items in production and storage areas. Passive RFID tags are att
A method and apparatus for tracking items automatically is described. A passive RFID (Radio Frequency IDentification) tag is used with a material tracking system capable of real-time pinpoint location and identification of thousands of items in production and storage areas. Passive RFID tags are attached to the item to be tracked, remote sensing antennas are placed at each remote location to be monitored, interrogators with several antenna inputs are connected to the sensing antennas to multiplex the antenna signals, and a host computer communicates with the interrogators to determine item locations to an exacting measure.
대표청구항▼
1. A system to track objects, the system comprising: a storage facility having a plurality of storage locations, each of the storage locations adapted to store at least one object;a plurality of radio frequency identification (RFID) tags, wherein each RFID tag is physically associated with a corresp
1. A system to track objects, the system comprising: a storage facility having a plurality of storage locations, each of the storage locations adapted to store at least one object;a plurality of radio frequency identification (RFID) tags, wherein each RFID tag is physically associated with a corresponding object;a host computer having a database; anda plurality of interrogators communicatively coupled to the host computer, each interrogator including a sensing antenna, wherein the sensing antennas are distributed around the storage facility, and wherein each sensing antenna is provided with a location identifier, each of the interrogators being configured to: interrogate the RFID tags for identification information via wireless radio frequency (RF) communications using the corresponding sensing antenna, wherein the interrogators interrogate the RFID tags by: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the interrogators is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the interrogators is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each sensing antenna; andin response to enabling the drivers for exciting the sensing antennas, receiving by the respective interrogators the identification information from each RFID tag that is within communication range of the excited sensing antennas;determine, based on a communication range for the wireless RF communications, storage location information of the objects with which the RFID tags are physically associated, wherein the storage location information of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas, andprovide the database with the storage location information of the objects. 2. The system of claim 1, wherein the storage facility comprises a plurality of stations. 3. The system of claim 2, wherein each of the stations has a plurality of shelves. 4. The system of claim 2, wherein each of the stations has a plurality of pallets. 5. The system of claim 2, wherein each of the stations has a plurality of containers. 6. The system of claim 1, wherein the storage facility comprises a warehouse. 7. The system of claim 1, wherein the storage locations are designated spaces for storage of objects. 8. The system of claim 1, wherein the storage location information of the objects includes lot locations. 9. The system of claim 1, wherein the host computer is configured to provide an inventory report of objects in the storage facility in substantially real time. 10. The system of claim 9, wherein the inventory report includes information of spare items. 11. The system of claim 1, wherein the host computer is further configured to provide reports about transfer times of the objects. 12. The system of claim 1, wherein the host computer is configured to provide a notification of arrival or departure of the objects. 13. The system of claim 1, wherein the host computer is configured to provide a history report of one or more objects based on interrogation of the RFID tags by the interrogators. 14. A system to track objects, the system comprising: a storage facility having a plurality of storage locations, each of the storage locations adapted to store at least one object;a plurality of radio frequency identification (RFID) tags, wherein each RFID tag is physically associated with a corresponding object;a controller computer having a database;a plurality of antennas distributed in the storage facility, wherein each antenna is provided with a location identifier; andat least one interrogator communicatively coupled to the antennas and the controller computer, wherein the at least one interrogator is configured to: interrogate the RFID tags for identification information via wireless radio frequency (RF) communications through the antennas, wherein the at least one interrogator interrogates the RFID tags by: exciting the corresponding antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identification information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the at least one interrogator is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the at least one interrogator is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each antenna; andin response to enabling the drivers for exciting the antennas, receiving by the at least one interrogator the identification information from each RFID tag that is within communication range of the excited antennas;determine, based on a communication range for the wireless RF communications, storage location information of the objects with which the RFID tags are physically associated, wherein the storage location information of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the antenna that is positioned closest to the object relative to the other antennas, andprovide the database with the storage location information of the objects. 15. The system of claim 14, wherein the controller computer is further configured to report a length of time spent in a process, based on the database. 16. The system of claim 14, wherein the controller computer is further configured to track a product in a manufacturing process that uses the storage facility. 17. The system of claim 14, wherein the controller computer is further configured to provide a notification of arrival or departure of one or more objects associated with one or more of the RFID tags. 18. The system of claim 14, wherein the controller computer is further configured to generate one or more history reports of one or more objects associated with one or more of the RFID tags. 19. The system of claim 14, wherein the controller computer is further configured to generate a spare inventory report. 20. The system of claim 14, wherein the plurality of antennas are configured for interrogation in a plurality of areas separately. 21. The system of claim 20, wherein each of the plurality of antennas is configured for interrogation of one of the storage locations. 22. The system of claim 21, wherein the interrogator is connected to the antennas to excite the antennas one at a time to interrogate the plurality of storage locations. 23. The system of claim 21, wherein each of the plurality of antennas is positioned for interrogation of no more than one of the storage locations. 24. The system of claim 23, wherein each of the antennas has a tuned tank circuit collocated with a corresponding antenna. 25. The system of claim 14, wherein the storage location information of the objects comprises unique storage locations of the objects in the storage facility. 26. The system of claim 14, wherein an identity of each of the antennas is independent from a port on the interrogator to which a respective antenna is attached. 27. The system of claim 26, wherein the respective antenna is attached to the port via cable and jack. 28. The system of claim 26, wherein the respective antenna is not collocated with the interrogator to which the respective antenna is connected. 29. The system of claim 14, wherein the communication range is on an order of two inches. 30. The system of claim 29, further comprising: a plurality of ferrous cover plates positioned to limit the communication range. 31. The system of claim 14, wherein the plurality of storage locations comprise flat components on which the objects are to be placed. 32. The system of claim 31, wherein the antennas are integrated within the flat components. 33. The system of claim 32, wherein each of the flat components is one of: a shelf, a pallet, a bench, and a table. 34. A system to track objects, the system comprising: a storage facility having a plurality of storage locations adapted to physically store a plurality of objects;a plurality of radio frequency identification (RFID) tags, wherein each RFID tag is attached to at least one of the objects;a database configured to be accessible from a multitude of locations;a plurality of sensing antennas distributed around the storage facility, wherein each sensing antenna is provided with a location identifier; anda plurality of interrogators coupled to the antennas and the database, wherein each of the interrogators is configured to: interrogate at least one RFID tag in vicinity of at least one of the sensing antennas for identification information, via wireless radio frequency (RF) communications through a corresponding one of the sensing antennas, wherein the interrogators interrogate the RFID tags by: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the interrogators is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the interrogators is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each sensing antenna; andin response to enabling the drivers for exciting the sensing antennas, receiving by the respective interrogators the identification information from each RFID tag that is within communication range of the excited sensing antennas;determine a storage location of the objects, wherein the storage location of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas, andcommunicate with the database to provide the storage location of each object. 35. The system of claim 34, wherein the sensing antennas are remote to the interrogators; and the sensing antennas are connected to the interrogators via cable and jack. 36. The system of claim 34, wherein each of the sensing antennas has a local tuned tank circuit remote to the interrogators. 37. The system of claim 34, wherein each of the interrogators is configured to excite the sensing antennas one at a time to interrogate the RFID tags. 38. The system of claim 34, further comprising a display device to provide a graphic display of real time storage location of the objects in the storage facility. 39. A system, comprising: a plurality of sensing antennas distributed around a storage facility having a plurality of storage locations adapted to physically store a plurality of objects, wherein each sensing antenna is provided with a location identifier;a plurality of radio frequency identification (RFID) tags attached to the objects;at least one interrogator coupled to the sensing antennas, wherein each interrogator is configured to: interrogate the RFID tags in vicinity of at least one of the sensing antennas for identification information, via wireless radio frequency communications through at least one of the sensing antennas, wherein the at least one interrogator interrogates the RFID tags by: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identification information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the at least one interrogator is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the at least one interrogator is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each sensing antenna; andin response to enabling the drivers for exciting the sensing antennas, receiving by the at least one interrogator the identification information from each RFID tag that is within communication range of the excited sensing antennas; anddetermine a storage location of the objects, wherein the storage location of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas; anda control computer coupled to the interrogator to provide the storage location of each object. 40. The system of claim 39, wherein the storage location of the object has resolution down to individual shelf and position. 41. The system of claim 39, wherein the control computer is further configured to provide one or more of: timing of one or more processes, timing of a transfer from a first point to a second point, and tracking of missing objects. 42. The system of claim 39, wherein the control computer is further configured to provide access to a database for storing the storage locations of the objects. 43. The system of claim 39, wherein the control computer is further configured to provide a history report of the objects in the storage facility. 44. The system of claim 39, further comprising: a plurality of tuned tank circuits co-located with the plurality of sensing antennas, respectively. 45. The system of claim 39, wherein the interrogator is connected to the sensing antennas via jack. 46. The system of claim 39, wherein the sensing antennas are magnetically preloaded to reduce sensitivity. 47. A method to track objects, the method comprising: interrogating radio frequency identification (RFID) tags for identification information, via wireless radio frequency (RF) communications, using a plurality of interrogators each having a sensing antenna distributed around a storage facility having a plurality of storage locations, each of the storage locations being adapted to store at least one object, wherein each RFID tag is physically associated with one of the objects, wherein the interrogating comprises: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the interrogators is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the interrogators is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each sensing antenna; andin response to enabling the drivers for exciting the sensing antennas, receiving by the respective interrogators the identification information from each RFID tag that is within communication range of the excited sensing antennas;determining, based on a communication range for the wireless RF communications, storage location information of the objects with which the RFID tags are physically associated, wherein the storage location information of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas; andstoring in a database the storage location information of the objects, via a host computer coupled with the interrogators. 48. The method of claim 47, wherein the storage facility comprises a plurality of stations. 49. The method of claim 48, wherein each of the stations has a plurality of one of: shelves, pallets, and containers. 50. The method of claim 47, further comprising: generating an inventory report of objects in the storage facility in substantially real time. 51. The method of claim 50, wherein the inventory report includes an inventory report of spare items. 52. The method of claim 47, further comprising reporting transfer times of the objects. 53. The method of claim 47, further comprising providing a notification of arrival or departure of the objects. 54. The method of claim 47, further comprising generating a history report of one or more objects based on interrogation of the RFID tags by the interrogators. 55. A method to track objects, the method comprising: providing a storage facility having a plurality of storage locations, each of the storage locations adapted to store at least one object having a radio frequency identification (RFID) tag physically associated with the object;interrogating RFID tags for identification information via wireless radio frequency (RF) communications through a plurality of antennas distributed in the storage facility, using at least one interrogator coupled to the antennas, wherein each antenna is provided with a location identifier, wherein the interrogating comprises: exciting the corresponding antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the at least one interrogator is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the at least one interrogator is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each antenna; andin response to enabling the drivers for exciting the antennas, receiving by the at least one interrogator the identification information from each RFID tag that is within communication range of the excited antennas;determining, based on a communication range for the wireless RF communications, storage location information of the objects with which the RFID tags are physically associated, wherein the storage location information of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the antenna that is positioned closest to the object relative to the other antennas; andstoring in a database the storage location information of the objects using a controller computer coupled to the at least one interrogator. 56. The method of claim 55, further comprising reporting a length of time spent in a process, based on the database. 57. The method of claim 55, further comprising tracking a product in a manufacturing process that uses the storage facility. 58. The method of claim 55, further comprising providing a notification of arrival or departure of one or more objects associated with one or more of the RFID tags. 59. The method of claim 55, further comprising generating one or more history reports of one or more objects associated with one or more of the RFID tags. 60. The method of claim 55, further comprising generating a report of spare inventory. 61. The method of claim 55, wherein an identity of each of the antennas is independent from a port on the interrogator to which a respective antenna is attached. 62. The method of claim 55, wherein the communication range is on an order of two inches. 63. A method to track objects, the method comprising: providing a plurality of sensing antennas distributed in a storage facility having a plurality of storage locations adapted to physically store a plurality of objects, wherein a radio frequency identification (RFID) tag is attached to each of the objects, each sensing antenna being provided with a location identifier;interrogating at least one RFID tag in vicinity of at least one of the sensing antennas for identification information using one of a plurality of interrogators, via wireless radio frequency (RF) communications through a corresponding one of the sensing antennas coupled to the interrogator, wherein the interrogating comprises: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the interrogator is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the interrogator is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each of the sensing antennas; andin response to enabling the drivers for exciting the sensing antennas, receiving by the interrogator the identification information from each RFID tag that is within communication range of the excited sensing antennas;determining a storage location of the objects, wherein the storage location of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas;communicating with a database to store the storage location of each object. 64. The method of claim 63, wherein the sensing antennas are remote to the interrogators; and the sensing antennas are connected to the interrogators via cable and jack. 65. The method of claim 63, wherein each of the interrogators is configured to excite the sensing antennas one at a time to interrogate the RFID tags. 66. The method of claim 63, further comprising generating a graphic display of real time storage location of the objects in the storage facility. 67. A method, comprising: interrogating, using at least one interrogator, a plurality of radio frequency identification (RFID) tags in vicinity of at least one of a plurality of sensing antennas for identification information, via wireless radio frequency (RF) communications through a corresponding one of the sensing antennas distributed around a storage facility, wherein each sensing antenna is provided with a location identifier, the storage facility having a plurality of storage locations adapted to physically store a plurality of objects, wherein the plurality of RFID tags is attached to the objects, wherein the interrogating comprises: exciting the corresponding sensing antennas to receive the identification information from at least some of the corresponding RFID tags;determining the RFID tags from which identifying information is not received;in the event that the identification information is not received from at least one of the RFID tags, determining whether a current iteration count for determining if the identification information is received at the at least one interrogator is above a limit for the number of iterations;in the event that the current iteration count for determining if the identification information is received at the at least one interrogator is not above the limit for the number of iterations, incrementing the iteration count and disabling and then enabling a driver for each antenna; andin response to enabling the drivers for exciting the sensing antennas, receiving by the at least one interrogator the identification information from each RFID tag that is within communication range of the excited sensing antennas;determining a storage location of the objects, wherein the storage location of each object is determined based on the identification information of the corresponding RFID tag and the location identifier of the sensing antenna that is positioned closest to the object relative to the other sensing antennas; andproviding the storage location of each object using a data processing system coupled to the interrogator. 68. The method of claim 67, further comprising: providing one or more of: timing of one or more processes, timing of a transfer from a first point to a second point, and tracking of missing objects. 69. The method of claim 67, further comprising providing access to a database storing data representing storage locations of the objects in the storage facility. 70. The method of claim 67, further comprising providing a history report of the objects in the storage facility. 71. The method of claim 67, further comprising: placing the objects at the storage locations in the storage facility.
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