Position Determination Using Measurements From Past And Present Epochs

• US 20110298658A1
• Filed: 06/02/2010
• Published: 12/08/2011
• Est. Priority Date: 06/02/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Riley, Wyatt Thomas, Rowitch, Douglas Neal, Farmer, Dominic Gerard
• Granted Patent: US 8,704,707 B2
• Time in Patent Office: Days
• US Class Current: 342/357.26
• 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 19/396 Determining accuracy or reliability of position or pseudorange measurements
• CPC Class Codes: G01S 19/42 Determining position
• CPC Class Codes: G01S 19/46 the supplementary measurement being of a radio-wave signal type
• CPC Class Codes: G01S 19/49 whereby the further system is an inertial position system, e.g. loosely-coupled
• CPC Class Codes: G01S 5/0236 Assistance data, e.g. base station almanac

Abstract

The subject matter disclosed herein relates to positioning systems and location determination using measurement stitching.

Claims

1. A method comprising:

storing a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information includes non-pseudorange measurements for at least one of said sources and is not sufficient to compute a navigation solution; and

obtaining a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

2. The method of claim 1, wherein said obtaining is in response to a changed signal environment and/or a changed view to said one or more sources.

3. The method of claim 1, wherein said second portion of information comprises position information from at least one source among said one or more sources.

4. The method of claim 1, wherein said second portion of information comprises a base station almanac (BSA) associated with said one or more sources.

5. The method of claim 1, wherein said second portion of information comprises ephemeris and time information of said one or more sources.

6. The method of claim 5, wherein said first portion of information comprises pseudorange and pseudorange rate measurements.

7. The method of claim 5, wherein said first portion of information comprises pseudorange and carrier phase measurements.

8. The method of claim 4, wherein said first portion of information comprises pilot phases.

9. The method of claim 4, wherein said first portion of information comprises received signal strength indicator (RSSI).

10. The method of claim 4, wherein said first portion of information comprises angle of arrival (AOA).

11. The method of claim 4, wherein said first portion of information comprises pseudorange rate measurements.

12. The method of claim 4, wherein said first portion of information comprises carrier phase measurements.

13. The method of claim 5, further comprising:

computing pseudorange measurements based, at least in part, on said ephemeris and time information, and on said stored first portion; and

computing said navigation solution based, at least in part, on said computed pseudorange measurements and said non-pseudorange measurements.

14. The method of claim 1, wherein said first portion of information comprises code phase detections.

15. The method of claim 1, wherein said one or more sources comprise satellite vehicles.

16. The method of claim 1, wherein said navigation solution comprises a position fix of a mobile receiver.

17. The method of claim 1, further comprising

disabling pseudo-range processing for at least one of said one or more sources during said first epoch;

and

enabling said pseudo-range processing for said at least one of said one or more sources subsequent to said first epoch.

18. The method of claim 1, wherein said second portion of information comprises position information of said one or more sources that are not in view during said first epoch.

19. A method comprising:

storing a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information excludes information based on received satellite positioning system (SPS) signals and is not sufficient to compute a navigation solution; and

obtaining a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

20. The method of claim 19, wherein said second portion of information comprises a base station almanac (BSA) associated with said one or more sources.

21. The method of claim 19, wherein said first portion of information comprises pilot phase information.

22. The method of claim 19, wherein said first portion of information comprises angle of arrival information.

23. The method of claim 19, wherein said first portion of information comprises received signal strength information (RSSI).

24. The method of claim 19, wherein said first portion of information comprises pseudorange rate measurements.

25. The method of claim 19, wherein said first portion of information comprises carrier phase measurements.

26. The method of claim 19, wherein said first portion of information comprises inertial sensor measurements.

27. The method of claim 26, wherein said second portion of information comprises a location fix of a past time interval.

28. The method of claim 27, further comprising:

extrapolating forward in time to a new location based, at least in part, on said location fix of said past time interval and based, at least in part, on said inertial sensor measurements.

29. The method of claim 19, wherein said first portion of information comprises ambiguous yaw and/or azimuth position information.

30. The method of claim 19, wherein said one or more sources comprise one or more terrestrial transmitters.

31. The method of claim 19, wherein said navigation solution comprises a position fix of a mobile receiver.

32. The method of claim 19, wherein said second portion of information comprises position information of said one or more sources that are not in view during said first epoch.

33. An apparatus comprising:

a memory to store a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information includes non-pseudorange measurements for at least one of said sources and is not sufficient to compute a navigation solution; and

a processing unit configured to obtain a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

34. The apparatus of claim 33, wherein said obtaining is in response to a changed signal environment and/or a changed view to said one or more sources.

35. An apparatus comprising:

means for storing a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information includes non-pseudorange measurements for at least one of said sources and is not sufficient to compute a navigation solution; and

means for obtaining a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

36. A computer-readable medium comprising instructions which, when executed by a processing unit, perform functions, the instructions comprising:

code to store a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information includes non-pseudorange measurements for at least one of said sources and is not sufficient to compute a navigation solution; and

code to obtain a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

37. An apparatus comprising:

a memory to store a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information excludes information based on received satellite positioning system (SPS) signals and is not sufficient to compute a navigation solution; and

a processing unit configured to obtain a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

38. An apparatus comprising:

means for storing a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information excludes information based on received satellite positioning system (SPS) signals and is not sufficient to compute a navigation solution; and

means for obtaining a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.

39. A computer-readable medium comprising instructions which, when executed by a processing unit, perform functions, the instructions comprising:

code to store a first portion of information acquired from one or more sources in a first epoch, wherein said stored first portion of information excludes information based on received satellite positioning system (SPS) signals and is not sufficient to compute a navigation solution; and

code to obtain a second portion of information subsequent to said first epoch, enabling use of said stored first portion of information in computing said navigation solution.