Tracking system and methods thereof

• US 7,626,499 B2
• Filed: 09/12/2006
• Issued: 12/01/2009
• 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:
  US11/519,245
• Publication Number:
  US 20070013512A1
• Time in Patent Office: 1,176 Days
• Field of Search: 340/539.13, 340/539.1, 340/539.11, 340/539.22, 340/539.23, 340/572.1, 340/572.4, 340/573.1, 340/573.4, 340/686.1, 340/825.36, 340/825.49, 340/825.69, 340/825.72
• 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 device to determine a position of an asset, comprising:

at least one accelerometer, configured to measure linear acceleration of the asset along at least one axis;

a wireless communication apparatus;

a processor, coupled to a signal conditioner; and

a memory, coupled to the processor, for storing accelerometer-calibration factors, a transformation matrix, and instructions executable by the processor including;

instructions to adjust the linear acceleration as measured by the at least one accelerometer, based on the accelerometer-calibration factors,

instructions to determine a position of the asset, based on the adjusted linear acceleration and the transformation matrix, and

instructions to transmit the position of the asset via the wireless communication apparatus.

2. The device of claim 1, further comprising:

at least one gyroscope, configured to measure a rotation of the asset about the at least one axis.

3. The device of claim 2, wherein the at least one gyroscope comprises three gyroscopes, and wherein the three gyroscopes are positioned to measure the rotation of the asset about three substantially orthogonal axes.

4. The device of claim 2, wherein the memory further stores gyroscope-calibration factors, and wherein the instructions further include:

instructions to adjust the rotation as measured by the gyroscope, based on the gyroscope-calibration factors.

5. The device of claim 4, wherein determining a position of the asset comprises determining the position of the asset, based on the adjusted linear acceleration, the transformation matrix, and the adjusted rotation.

6. The device of claim 1, wherein the at least one accelerometer comprises three accelerometers, and wherein the three accelerometers are positioned to measure linear acceleration of the asset about three substantially orthogonal axes.

7. The device of claim 1, wherein the transformation matrix allows transformation from a computational frame of reference to a user frame of reference, wherein the user frame of reference is fixed to a stable structure, and wherein the computational frame of reference is associated with the tracking device.

8. The device of claim 1, wherein the instructions further comprise:

instructions to rotate the adjusted linear acceleration about a body axis.

9. The device of claim 8, wherein the instructions further comprise:

instructions to apply a gravity compensation to the rotated linear acceleration.

10. The device of claim 9, wherein determining a position of the asset comprises integrating the gravity-compensated linear acceleration.

11. The device of claim 1, wherein the instructions further comprise:

instructions to periodically update the transformation matrix.

12. A device to determine a position of an asset, comprising:

at least one accelerometer, configured to transmit measurements of linear acceleration of the asset along at least one axis;

at least one gyroscope, configured to transmit measurements of rotation of the asset about the at least one axis;

a wireless communication apparatus;

a processor, configured to receive the measurements from the at least one accelerometer and the at least one gyroscope; and

a memory, coupled to the processor, for storing a linear acceleration from the at least one accelerometer and a rotation from the at least one gyroscope, and instructions executable by the processor including;

instructions to determine a position of the asset, based on the linear acceleration and rotation, and

instructions to transmit the position of the asset via the wireless communication apparatus.

13. The device of claim 12, wherein the at least one gyroscope comprises three gyroscopes.

14. The device of claim 13, wherein the three gyroscopes are positioned to measure the rotation of the asset about three substantially orthogonal axes.

15. The device of claim 12, wherein the at least one accelerometer comprises three accelerometers.

16. The device of claim 15, wherein the three accelerometers are positioned to measure linear acceleration of the asset about three substantially orthogonal axes.

17. The device of claim 12, wherein the memory further stores a transformation matrix and the instructions further comprise:

instructions to transform the position of the asset from a computational frame of reference to a user frame of reference using the transformation matrix, wherein the user frame of reference is fixed to a stable structure, and wherein the computational frame of reference is associated with the tracking device.

18. The device of claim 17, wherein the instructions further comprise:

instructions to periodically update the transformation matrix.

19. The device of claim 12, wherein the memory further stores accelerometer-calibration factors for the at least one accelerometer, and wherein the instructions further comprise:

instructions to adjust the linear acceleration based on the accelerometer-calibration factors.

20. The device of claim 12, wherein the memory further stores gyroscope-calibration factors for the at least one gyroscope, and wherein the instructions further comprise:

instructions to adjust the rotation based on the gyroscope-calibration factors.