Systems and methods for location of objects

• US 8,233,043 B2
• Filed: 12/18/2006
• Issued: 07/31/2012
• Est. Priority Date: 01/02/2003
• Status: Active Grant

• Current Assignee: UTC Fire & Security Americas Corporation, Inc. (Carrier Global Corporation)
• Original Assignee: UTC Fire & Security Americas Corporation, Inc. (Carrier Global Corporation)
• Inventors: Washington, Richard G.
• Primary Examiner(s): Dastouri, Mehrdad
• Assistant Examiner(s): Rahaman, Mohammed
• Application Number:
  US11/641,029
• Publication Number:
  US 20070097211A1
• Time in Patent Office: 2,052 Days
• Field of Search: 348/143, 348/373, 348162-164
• US Class Current: 348/143
• CPC Class Codes: G06K 7/10079 the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
• CPC Class Codes: G08B 13/19608 Tracking movement of a target, e.g. by detecting an object predefined as a target, using target direction and or velocity to predict its new position
• CPC Class Codes: G08B 13/1963 Arrangements allowing camera rotation to change view, e.g. pivoting camera, pan-tilt and zoom [PTZ]
• CPC Class Codes: G08B 13/19656 Network used to communicate with a camera, e.g. WAN, LAN, Internet
• CPC Class Codes: G08B 13/19693 using multiple video sources viewed on a single or compound screen
• CPC Class Codes: G08B 13/19697 Arrangements wherein non-video detectors generate an alarm themselves
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00

Abstract

Systems and methods that may be employed to visually locate and/or track objects equipped with active RFID tags. The disclosed systems and methods may employ an articulated camera/s, such as closed circuit television (“CCTV”) or other suitable type of articulated camera/s, that is equipped with an antenna array.

Claims

1. A camera assembly unit comprising

an optical block;

a RF receiver, said RF receiver being configured to receive from an antenna an RF signal comprising a RFID broadcast transmitted by a RFID device; and

a differential antenna apparatus comprising said antenna, said differential antenna apparatus being configured to receive and provide said RF signal comprising said RFID broadcast transmitted by said RFID device to said RF receiver;

wherein said camera assembly unit is configured to use said optical block to scan a location of said RF signal transmitted by said RFID device while receiving said RF signal from said differential antenna apparatus based on said RF signal received by said differential antenna apparatus; and

wherein said camera assembly unit is further configured to provide a visual image signal corresponding to one or more null line of sight (LOS) positions of said optical block of said camera assembly.

2. The camera assembly unit of claim 1, further comprising an RF transceiver, said RF transceiver comprising said RF receiver;

and wherein said RF transceiver is configured to provide a RF signal comprising RFID device activation data to an antenna.

3. The camera assembly unit of claim 1, wherein said camera assembly unit comprises a PTZ camera assembly unit.

4. The camera assembly unit of claim 1, wherein said differential antenna apparatus is directionally aligned with said optical block of said camera assembly unit.

5. The camera assembly unit of claim 4, wherein said differential antenna apparatus comprises a differential antenna array.

6. The camera assembly unit of claim 5, wherein said differential antenna array comprises a first pair of antenna elements and a second pair of antenna elements;

wherein said first pair of antenna elements comprise first and second antenna elements symmetrically positioned on respective first and second opposite sides of said optical block of said camera assembly unit; and

wherein said second pair of antenna elements comprise third and fourth antenna elements symmetrically positioned on respective third and fourth opposite sides of said optical block of said camera assembly unit.

7. The camera assembly of claim 6, wherein said camera assembly unit comprises a PTZ camera assembly unit;

wherein said first and second antenna elements are symmetrically positioned in vertical relationship with each other on said respective first and second opposite sides of said optical block of said camera assembly unit; and

wherein said third and fourth antenna elements are symmetrically positioned in horizontal relationship with each other on said respective third and fourth opposite sides of said optical block of said camera assembly unit.

8. The camera assembly unit of claim 7, wherein said differential antenna array is positioned adjacent a image gathering lens of said optical block.

9. The camera assembly unit of claim 7, further comprising signal processing circuitry coupled to said differential antenna array, said signal processing circuitry configured to receive first and second RF signals from said respective first and second antenna elements and to receive third and fourth RF signals from said respective third and fourth antenna elements;

to provide at least one of a first signal strength signal or a first differential output signal based upon a combination of said first and second RF signals; and

to provide at least one of a second signal strength signal or a second differential output signal based upon a combination of said second and third RF signals.

10. The camera assembly unit of claim 5, further comprising signal processing circuitry coupled to said differential antenna array, said signal processing circuitry configured to receive one or more RF signals from said differential antenna array, and to provide at least one of a signal strength signal or a differential output signal based upon said one or more RF signals.

11. The camera assembly unit of claim 10, wherein said signal processing circuitry is configured to be coupled to a network of multiple camera assemblies, said network of multiple camera assemblies comprising a part of a visual locating system.

12. The camera assembly unit of claim 11, wherein said signal processing circuitry further comprises a digital signal processor configured to determine at least one null point value of said differential output signal with respect to position of said optical block.

13. The camera assembly unit of claim 10, wherein said signal processing circuitry further comprises a digital signal processor configured to determine at least one null point value of said differential output signal with respect to position of said optical block.

14. The camera assembly of claim 1, wherein the line of sight of said optical block is configured to move cooperatively with a directional line of reception of said antenna.

15. The camera assembly unit of claim 1, wherein said differential antenna apparatus is directionally aligned with a line of sight (LOS) of said optical block of said camera assembly unit;

and wherein said camera assembly unit further comprises signal processing circuitry configured to align said LOS of said optical block with a location of the source of said RFID broadcast transmitted by said first RFID device by determining the relationship between said LOS and said source location by analyzing the emitted signals from said first RFID device.

16. The camera assembly unit of claim 1, wherein said camera assembly unit is configured to automatically perform said scan of said location, and to automatically provide said visual image.

17. A camera assembly comprising

an optical block;

an embedded RF antenna;

wherein said embedded RF antenna is configured to receive a RFID broadcast transmitted by a RFID device; and

an embedded RF receiver, wherein said embedded RF receiver is configured to receive from said embedded RF antenna a RF signal comprising said RFID broadcast transmitted by said RFID device;

wherein said camera assembly unit is configured to use said optical block to scan a location of said RF signal transmitted by said RFID device while receiving said RF signal from said embedded RF antenna based on said RF signal received by said embedded RF antenna; and

wherein said camera assembly unit is further configured to provide a visual image signal corresponding to one or more null line of sight (LOS) positions of said optical block of said camera assembly.

18. The camera assembly of claim 17, wherein said embedded RF antenna comprises an embedded differential antenna apparatus.

19. The camera assembly unit of claim 18, wherein said embedded differential antenna apparatus is directionally aligned with a line of sight (LOS) of said optical block of said camera assembly unit;

and wherein said camera assembly further comprises signal processing circuitry configured to align said LOS of said optical block with a location of the source of said RFID broadcast transmitted by said first RFID device by determining the relationship between said LOS and said source location by analyzing the emitted signals from said first RFID device.

20. The camera assembly of claim 17, wherein said embedded RF antenna comprises an embedded differential antenna array.

21. The camera assembly of claim 20, wherein said embedded differential antenna array is directionally aligned with said optical block of said camera assembly.

22. The camera assembly of claim 17, wherein said camera assembly is configured to automatically perform said scan of said location, and to automatically provide said visual image signal.

23. The camera assembly of claim 17, wherein said camera assembly comprises a PTZ camera assembly.

24. The camera assembly of claim 17, wherein said embedded RF receiver comprises embedded signal conditioning circuitry.

25. The camera assembly of claim 17, wherein the line of sight of said optical block is configured to move cooperatively with a directional line of reception of said embedded RF antenna.

26. The camera assembly of claim 17, wherein said camera assembly comprises an embedded RF transceiver.

27. A method of aligning an optical block of a camera assembly with an RFID device, comprising:

providing a camera assembly unit comprising an optical block and a RF receiver, said RF receiver being configured to receive from an antenna an RF signal comprising a RFID broadcast transmitted by said RFID device;

receiving a RFID broadcast transmitted by a RFID device, said RFID broadcast being received by said RF receiver from said antenna;

aligning said optical block of said camera assembly with said RFID device based on said RFID broadcast received by said RF receiver from said antenna;

wherein aligning said optical block comprises scanning a location of said RFID broadcast transmitted by said RFID device while receiving said RFID broadcast based on said RFID broadcast received by said RF receiver from said antenna; and

providing a visual image signal corresponding to one or more null line of sight (LOS) positions of said optical block of said camera assembly.

28. The method of claim 27, wherein said camera assembly unit further comprises a differential antenna apparatus, and wherein said method further comprises using said differential antenna apparatus to receive and provide said RF signal comprising a RFID broadcast transmitted by a RFID device to said RF receiver.

29. The method of claim 28, wherein said camera assembly unit comprises a PTZ camera assembly unit.

30. The method of claim 28, wherein said differential antenna apparatus comprises a differential antenna array integrated with said camera assembly;

and wherein said differential antenna array is directionally aligned with said optical block of said camera assembly unit.

31. The method of claim 28, wherein said differential antenna apparatus is directionally aligned with the line of sight (LOS) of said optical block of said camera assembly unit;

and wherein said method further comprises aligning said LOS of said optical block with a location of a source of said RFID broadcast transmitted by said RFID device by determining a relationship between said LOS and said location by analyzing emitted signals from said RFID device.

32. The method of claim 28, further comprising using said optical block to scan a location of said RFID broadcast transmitted by said RFID device while receiving said RFID broadcast by said differential antenna apparatus based on said RFID broadcast received by said differential antenna apparatus.

33. The method of claim 32, further comprising selecting one or more visual images from said optical block scan, said one or more visual images being directionally selected based on directional reception characteristics of said RFID broadcast received by said differential antenna apparatus.

34. The method of claim 33, further comprising using said camera assembly unit to automatically perform said optical block scan of said location, and automatically selecting said one or more visual images from said optical block scan.

35. The method of claim 27, further comprising moving a line of sight of said optical block cooperatively with a directional line of reception of said antenna.