METHOD AND APPARATUS FOR POSITION DETERMINATION WITH EXTENDED SPS ORBIT INFORMATION

• US 20130201059A1
• Filed: 08/09/2012
• Published: 08/08/2013
• Est. Priority Date: 11/10/2006
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wengler, Michael James, Sheynblat, Leonid, Moeglein, Mark Leo, Biacs, Zoltan F., Gum, Arnold Jason
• Application Number:
  US13/571,178
• Publication Number:
  US 20130201059A1
• Time in Patent Office: Days
• US Class Current: 342/357.66
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/27 creating, predicting or correcting ephemeris or almanac data within the receiver

Abstract

A method and system for assisting mobile stations to locate a satellite use an efficient messaging format. A server computes a correction between coarse orbit data of a satellite and precise orbit data of the satellite. A coordinate system is chosen such that variation of the correction is substantially smooth over time. The server further approximates the correction with mathematical functions to reduce the number of bits necessary for transmission to a mobile station. The mobile station, upon receiving the coefficients, evaluates the mathematical functions using the coefficients and a time of applicability (e.g., the current time), converts the evaluated result to a standard coordinate system, and applies the conversion result to the coarse orbit data to obtain the precise orbit data.

Claims

1. A method of a mobile station, comprising:

receiving real-time orbit data from a plurality of satellites for a determination of spatial and time information of the mobile station; and

using the real-time orbit data of the plurality of satellites to correct an error of a clock bias in predicted orbit data of one or more additional satellites, wherein the number of satellites in the plurality of satellites is equal to or greater than the number of unknowns in the spatial and time information of the mobile station.

2. The method of claim 1, further comprising:

using the real-time orbit data of a first satellite in the plurality of satellites to correct the error of the clock bias in the predicted orbit data of the first satellite.

3. The method of claim 1, further comprising:

correcting the error of the clock bias in predicted orbit data using an estimation method.

4. The method of claim 1, wherein the estimation method includes a linear, linearized, or non-linear estimation method.

5. The method of claim 1, wherein the estimation method includes a Kalman filter or weighted least squares.

6. A mobile station, comprising:

a receiver configured to receive real-time orbit data from a plurality of satellites for a determination of spatial and time information of the mobile station; and

a processor configured to use the real-time orbit data of the plurality of satellites to correct an error of a clock bias in predicted orbit data of one or more additional satellites, wherein the number of satellites in the plurality of satellites is equal to or greater than the number of unknowns in the spatial and time information of the mobile station.

7. The mobile station of claim 6, wherein the processor is further configured to use the real-time orbit data of a first satellite in the plurality of satellites to correct the error of the clock bias in the predicted orbit data of the first satellite.

8. The mobile station of claim 6, wherein the processor is further configured to correct the error of the clock bias in predicted orbit data using an estimation method.

9. The mobile station of claim 6, wherein the estimation method includes a linear, linearized, or non-linear estimation method.

10. The mobile station of claim 6, wherein the estimation method includes a Kalman filter or weighted least squares.

11. A mobile station, comprising:

means for receiving real-time orbit data from a plurality of satellites for a determination of spatial and time information of the mobile station; and

means for using the real-time orbit data of the plurality of satellites to correct an error of a clock bias in predicted orbit data of one or more additional satellites, wherein the number of satellites in the plurality of satellites is equal to or greater than the number of unknowns in the spatial and time information of the mobile station.

12. The mobile station of claim 11, further comprising:

means for using the real-time orbit data of a first satellite in the plurality of satellites to correct the error of the clock bias in the predicted orbit data of the first satellite.

13. The mobile station of claim 11, further comprising:

means for correcting the error of the clock bias in predicted orbit data using an estimation method.

14. The mobile station of claim 11, wherein the estimation method includes a linear, linearized, or non-linear estimation method.

15. The mobile station of claim 11, wherein the estimation method includes a Kalman filter or weighted least squares.

16. A computer program product configured to enable a processor to assist a mobile station, the computer program product comprising instructions to cause the processor to:

receive real-time orbit data from a plurality of satellites for a determination of spatial and time information of the mobile station; and

use the real-time orbit data of the plurality of satellites to correct an error of a clock bias in predicted orbit data of one or more additional satellites, wherein the number of satellites in the plurality of satellites is equal to or greater than the number of unknowns in the spatial and time information of the mobile station.

17. The computer program product of claim 16, wherein the instructions further cause the processor to use the real-time orbit data of a first satellite in the plurality of satellites to correct the error of the clock bias in the predicted orbit data of the first satellite.

18. The computer program product of claim 16, wherein the instructions further cause the processor to correct the error of the clock bias in predicted orbit data using an estimation method.

19. The computer program product of claim 16, wherein the estimation method includes a linear, linearized, or non-linear estimation method.

20. The computer program product of claim 16, wherein the estimation method includes a Kalman filter or weighted least squares.