Method for Adjusting a Measurement Cycle in a Satellite Positioning System Signal Receiver

• US 20110260913A1
• Filed: 07/05/2011
• Published: 10/27/2011
• Est. Priority Date: 08/05/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Global Locate Incorporated (Broadcom, Inc.)
• Inventors: Abraham, Charles
• Granted Patent: US 8,508,407 B2
• Time in Patent Office: Days
• US Class Current: 342/357.25
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station

Abstract

A method for adjusting a measurement cycle in a satellite signal receiver is described. The method includes adjusting a measurement cycle in a satellite signal receiver by computing a position state comprising at least one of a velocity and a heading of the satellite signal receiver, detecting a change in the position state, and automatically adjusting a frequency of said measurement cycle in response to the change in the position state.

Claims

1. A method for adjusting a measurement cycle in a satellite signal receiver, comprising:

computing a position state comprising at least one of a velocity and a heading of the satellite signal receiver;

detecting a change in the position state; and

automatically adjusting a frequency of said measurement cycle in response to the change in the position state.

2. The method of claim 1, further comprising;

determining a degree of accuracy for the position state; and

automatically adjusting the frequency of said measurement cycle in response to the degree of accuracy for the position state.

4. The method of claim 1 wherein the position state is computed using a sequential estimation filter.

5. The method of claim 4, wherein the computing step further comprises:

generating a history of the position state;

providing the history of the position state to the sequential estimation filter; and

updating the position state of the sequential estimation filter using the history of the position state.

6. The method of claim 1, further comprising:

providing at least one of a clock state and a frequency state to the sequential estimation filter; and

updating the position state using the at least one of a clock state and a frequency state.

7. The method of claim 1, wherein detecting a change in the position state further comprises detecting a change in the velocity.

8. The method of claim 1, wherein detecting a change in the position state further comprises detecting a change in the heading.

9. The method of claim 1, wherein computing a position state comprises using at least one pseudorange supplied to a sequential estimation filter to calculate the position state.

10. The method of claim 1, wherein computing a position state comprises using a Kalman filter to converge to the position state.

11. The method of claim 1, wherein computing a position state comprises using a Batch filter to generate the position state.

12. The method of claim 1, wherein the position state is computed using a motion measurement device.

13. The method of claim 12, wherein the motion measurement device is at least one of an accelerometer, a speedometer, a compass, and a flux-gate compass.

3. A method for adjusting a measurement cycle in a satellite signal receiver, comprising:

determining a level of power consumption for the satellite signal receiver; and

automatically adjusting the frequency of said measurement cycle in response to the level of power consumption for the satellite signal receiver.

14. A method for adjusting a measurement cycle in a satellite signal receiver, comprising:

providing to the satellite signal receiver from at least one motion measurement device a notification of a course-change event; and

automatically adjusting a frequency of said measurement cycle in response to the notification.

15. The method of claim. 14, further comprising detecting the course-change event using at least one of an accelerometer, a speedometer, a compass, and a flux-gate compass.

16. The method of claim 15 further comprising:

detecting a first motion state using the at least one of an accelerometer, a speedometer, a compass, and a flux-gate compass; and

establishing a threshold in accordance with a given metric to delineate whether the satellite signal receiver has transitioned from the first motion state to a second motion state, wherein the course change event comprises the transition from the first motion state to a second motion state.

17. The method of claim 14 further comprising:

decreasing the frequency of said measurement cycle in response to a decrease in the level of power consumption for the satellite signal receiver.

18. The method of claim 17 further comprising:

increasing the frequency of said measurement cycle in response to an increase in the level of power consumption for the satellite signal receiver.

19. The method of claim 14 further comprising:

increasing the degree of accuracy for the position state; and

automatically increasing the frequency of said measurement cycle in response to the increased degree of accuracy for the position state.

20. The method of claim 14 further comprising:

decreasing the degree of accuracy for the position state; and

automatically decreasing the frequency of said measurement cycle in response to the decreased degree of accuracy for the position state.