Tracking system and methods thereof

• US 8,279,062 B2
• Filed: 03/31/2008
• Issued: 10/02/2012
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: Intellectual Ventures Assets 192 LLC (Intellectual Ventures LLC)
• Original Assignee: Amstr Investments 19 KG LLC (Intellectual Ventures LLC)
• Inventors: Burneske, Gregory W., Schleifer, Fred F.
• Primary Examiner(s): Nguyen, Hung T.
• Application Number:
  US12/059,818
• Publication Number:
  US 20090015399A1
• Time in Patent Office: 1,646 Days
• Field of Search: 340/539.13, 340/539.1, 340/573.1, 340/573.4, 340/825.49, 340/825.69, 340/825.72, 340/539.11, 340/539.19, 340/539.22, 701/213, 701/214, 701/220, 701/221
• US Class Current: 340/539.13
• CPC Class Codes: G01C 21/005 with correlation of navigation data from several sources, e.g. map or contour matching G01C21/30 takes precedence
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00
• CPC Class Codes: G08B 13/2485 Simultaneous detection of multiple EAS tags

Abstract

The present invention relates generally to tracking systems and methods for monitoring the location of an asset or group of assets. In particular, the present invention provides systems for monitoring the location of a large group of assets. Furthermore, the present invention provides systems and methods for identifying an asset within a group of assets.

Claims

1. A method comprising:

measuring an acceleration of an asset to obtain an acceleration value using a tracking device;

adjusting, using the tracking device, the acceleration value based on accelerometer-calibration factors to obtain an adjusted-acceleration value;

determining, using the tracking device, a position of the asset based on the adjusted-acceleration value and a transformation matrix, wherein the transformation matrix allows transformation from a computational frame of reference to a user frame of reference;

updating, using the tracking device, the transformation matrix based on a manual alignment fixture; and

transmitting the position of the asset from tracking device.

2. The method of claim 1, wherein measuring the acceleration of the asset comprises measuring a linear acceleration of the asset.

3. The method of claim 1, wherein measuring the acceleration of the asset comprises measuring the acceleration of the asset along at least one axis.

4. The method of claim 1, wherein the user frame of reference is fixed to a stable structure, and wherein the computational frame of reference is associated with a tracking device.

5. The method of claim 1, wherein updating the transformation matrix further comprises updating the transformation matrix based on a contact with a homing station.

6. The method of claim 1, wherein updating the transformation matrix further comprises updating the transformation matrix periodically to account for planetary rotation.

7. The method of claim 1, wherein adjusting the acceleration value comprises aligning an axis of the computational frame to a gravity vector.

8. The method of claim 1, further comprising:

measuring a rotation of the asset about at least one axis to obtain a rotation value.

9. The method of claim 8, further comprising:

adjusting the rotation value of the asset to obtain an adjusted-rotation value; and

wherein determining the position of the asset comprises determining the position of the asset based on the adjusted-acceleration value and the adjusted-rotation value.

10. The method of claim 1, wherein determining the position of the asset comprises determining a reported asset path of the asset.

11. The method of claim 10, wherein determining the reported asset path of the asset comprises determining a likelihood of the reported asset path.

12. The method of claim 11, wherein determining the likelihood of the reported asset path comprises determining the likelihood of the reported asset path based on one or more physical building constraints.

13. The method of claim 1, wherein measuring the acceleration of the asset comprises measuring the acceleration of the asset with a tracking device, and wherein at least some of the accelerometer-calibration factors are determined at a time of manufacture of the tracking device.

14. The method of claim 13, wherein the at least some of the accelerometer calibration factors determined at the time of manufacture correct for offset, scale, and misalignment errors.

15. The method of claim 13, wherein the accelerometer calibration factors are stored in a non-volatile memory of the tracking device.

16. An apparatus comprising:

means for measuring an acceleration of an asset to obtain an acceleration value;

means for adjusting the acceleration value based on accelerometer-calibration factors to obtain an adjusted-acceleration value;

means for determining a position of the asset based on the adjusted-acceleration value and a transformation matrix, wherein the transformation matrix allows transformation from a computational frame of reference to a user frame of reference;

means for updating the transformation matrix based on a manual alignment fixture; and

means for transmitting the position of the asset.

17. The apparatus of claim 16, wherein the means for measuring the acceleration of the asset comprise means for measuring the acceleration of the asset along at least one axis.

18. The apparatus of claim 16, further comprising:

means for measuring a rotation of the asset about at least one axis to obtain a rotation value.

19. The apparatus of claim 16, wherein the accelerometer-calibration factors are determined at a time of manufacture of the apparatus.

20. The apparatus of claim 19, wherein the at least some accelerometer calibration factors determined at the time of manufacture correct for offset, scale, and misalignment errors.

21. The apparatus of claim 19, further comprising means for storing the accelerometer-calibration factors.

22. A computer-readable storage device having instructions thereon, the instructions comprising:

instructions to measure an acceleration of an asset to obtain an acceleration value;

instructions to adjust the acceleration value based on accelerometer-calibration factors to obtain an adjusted-acceleration value;

instructions to determine a position of the asset based on the adjusted-acceleration value and a transformation matrix, wherein the transformation matrix allows transformation from a computational frame of reference to a user frame of reference;

instructions to update the transformation matrix based on a manual alignment fixture; and

instructions to transmit the position of the asset.

23. The computer-readable storage device of claim 22, wherein the instructions to measure the acceleration of the asset comprise instructions to measure a linear acceleration of the asset.

24. The computer-readable storage device of claim 22, wherein the user frame of reference is fixed to a stable structure, and wherein the computational frame of reference is associated with a tracking device.

25. The computer-readable storage device of claim 22, wherein the instructions to update the transformation matrix comprise instructions to update the transformation matrix based on a contact with a homing station.

26. The computer-readable storage device of claim 22, wherein the instructions to update the transformation matrix comprise instructions to update the transformation matrix periodically to account for planetary rotation.

27. The computer-readable storage device of claim 22, wherein the instructions to adjust the acceleration value comprise instructions to align an axis of the computational frame to a gravity vector.

28. The computer-readable storage device of claim 22, further comprising instructions to measure a rotation of the asset about at least one axis to obtain a rotation value.

29. The computer-readable storage device of claim 28, further comprising instructions to adjust the rotation value of the asset to obtain an adjusted-rotation value, and wherein the instructions to determine the position of the asset comprise instructions to determine the position of the asset based on the adjusted-acceleration value and the adjusted rotation value.

30. The computer-readable storage device of claim 22, further comprising instructions to determine a reported asset path of the asset and a likelihood of the reported asset path.

31. The computer-readable storage device of claim 30, wherein the instructions to determine the likelihood of the reported asset path comprise instructions to determine the likelihood of the reported asset path based on one or more physical building constraints.