METHOD AND SYSTEM FOR CALIBRATING GROUP DELAY ERRORS IN A COMBINED GPS AND GLONASS RECEIVER

• US 20100039321A1
• Filed: 08/15/2008
• Published: 02/18/2010
• Est. Priority Date: 08/15/2008
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Abraham, Charles
• Granted Patent: US 7,859,454 B2
• Time in Patent Office: Days
• US Class Current: 342/357.270
• CPC Class Codes: G01S 19/23 Testing, monitoring, correcting or calibrating of receiver elements
• CPC Class Codes: G01S 19/33 Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS

Abstract

Aspects of a method and system for calibrating group delay errors in a combined GPS and GLONASS receiver are provided. The combined GPS and GLONASS receiver may be enabled to receive both GPS signals and GLONASS signals. GPS based navigation information may be calculated based on the received GPS signals. Group delay errors resulted by the received GLONASS signals may be calibrated based on the GPS based navigation information. Respective GLONASS signals may be estimated in responsive to the GPS based navigation information. Corresponding clock information associated with the estimated GLONASS signals may be transferred from the clock information of the GPS based navigation information. A calibration signal may be generated by comparing the estimated GLONASS signals with the received GLONASS signals. The calibration signal may be processed by an error state Kalman filter and may be used to offset the group delay errors in the combined GPS and GLONASS receiver.

Claims

1. A method of processing signals, the method comprising

receiving a plurality of GPS signals and a plurality of GLONASS signals;

determining GPS navigation information for said plurality of GPS signals; and

calibrating one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

2. The method according to claim 1, comprising generating estimates of one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

3. The method according to claim 2, comprising estimating one or more of said plurality of GLONASS signal utilizing GPS receiver clock information from said determined GPS navigation information.

4. The method according to claim 2, comprising comparing one or more estimated GLONASS signals to one or more of said received plurality of GLONASS signals.

5. The method according to claim 4, comprising generating a calibration signal based on said comparison.

6. The method according to claim 5, comprising calibrating one or more of said received plurality of GLONASS signals utilizing said generated calibration signal.

7. The method according to claim 6, comprising processing said generated calibration signal by a Kalman filter prior to said calibrating.

8. The method according to claim 5, comprising calibrating group delay errors in said received plurality of GLONASS signals utilizing said generated calibration signal.

9. A system for processing signals, the system comprising:

one or more circuits operable to receive a plurality GPS signals and a plurality of GLONASS signals;

said one or more circuits determines GPS navigation information for said plurality of GPS signals; and

said one or more circuits calibrates one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

10. The system according to claim 9, wherein said one or more circuits generates estimates of one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

11. The system according to claim 10, wherein said one or more circuits estimates one or more of said plurality of GLONASS signal utilizing GPS receiver clock information from said GPS navigation information.

12. The system according to claim 10, wherein said one or more circuits compares one or more estimated GLONASS signals to one or more of said received plurality of GLONASS signals.

13. The system according to claim 12, wherein said one or more circuits generates a calibration signal based on said comparison.

14. The system according to claim 13, wherein said one or more circuits calibrates one or more of said received plurality of GLONASS signals utilizing said generated calibration signal.

15. The system according to claim 14, wherein said one or more circuits comprises a calibration Kalman filter operable to process said generated calibration signal prior to said calibrating.

16. The system according to claim 13, wherein said one or more circuits calibrates group delay errors in said received plurality of GLONASS signals utilizing said generated calibration signal.

17. A machine-readable storage having stored thereon, a computer program having at least one code section for providing signal processing, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

receiving a plurality GPS signals and a plurality of GLONASS signals;

determining GPS navigation information for said plurality of GPS signals; and

calibrating one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

18. The machine-readable storage according to claim 17, wherein said at least one code section comprises code for generating estimates of one or more of said plurality of GLONASS signals based on said determined GPS navigation information.

19. The machine-readable storage according to claim 18, wherein said at least one code section comprises code for estimating one or more of said plurality of GLONASS signal utilizing GPS receiver clock information from said GPS navigation information.

20. The machine-readable storage according to claim 18, wherein said at least one code section comprises code for comparing one or more estimated GLONASS signals to one or more of said received plurality of GLONASS signals.

21. The machine-readable storage according to claim 20, wherein said at least one code section comprises code for generating a calibration signal based on said comparison.

22. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for calibrating one or more of said received plurality of GLONASS signals utilizing said generated calibration signal.

23. The machine-readable storage according to claim 22, wherein said at least one code section comprises code for processing said generated calibration signal by a Kalman filter prior to said calibrating.

24. The machine-readable storage according to claim 21, wherein said at least one code section comprises code for calibrating group delay errors in said received plurality of GLONASS signals utilizing said generated calibration signal.