POSITION DETERMINATION USING MEASUREMENTS FROM PAST AND PRESENT EPOCHS

• US 20140225770A1
• Filed: 04/17/2014
• Published: 08/14/2014
• 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 10,247,828 B2
• Time in Patent Office: Days
• US Class Current: 342/357.22
• 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 for determining a navigation solution comprising:

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

obtaining a second portion of information subsequent to the first epoch, which enables use of the stored first portion of information in computing the navigation solution, the second portion of information comprising position information from at least one source among the one or more sources.

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

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

4. The method of claim 3, wherein the first portion of information comprises pseudorange and pseudorange rate measurements.

5. The method of claim 3, wherein the first portion of information comprises pseudorange and carrier phase measurements.

6. The method of claim 2, wherein the first portion of information comprises pilot phases.

7. The method of claim 2, wherein the first portion of information comprises received signal strength indicator (RSSI).

8. The method of claim 2, wherein the first portion of information comprises angle of arrival (AOA).

9. The method of claim 2, wherein the first portion of information comprises pseudorange rate measurements.

10. The method of claim 2, wherein the first portion of information comprises carrier phase measurements.

11. The method of claim 3, further comprising:

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

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

12. The method of claim 1, wherein the first portion of information comprises code phase detections.

13. The method of claim 1, wherein the one or more sources comprise satellite vehicles.

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

15. The method of claim 1, further comprising

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

and

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

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

17. An apparatus comprising:

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

a processing unit configured to obtain a second portion of information subsequent to the first epoch, which enables use of the stored first portion of information in computing the navigation solution, the second portion of information comprising position information from at least one source among the one or more sources.

18. The apparatus of claim 17, wherein the obtaining is in response to a changed signal environment and/or a changed view to the one or more sources.

19. An apparatus comprising:

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

means for obtaining a second portion of information subsequent to the first epoch, which enables use of the stored first portion of information in computing the navigation solution, the second portion of information comprising position information from at least one source among the one or more sources.

20. A non-transitory 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 the stored first portion of information includes non-pseudorange measurements for at least one of the sources and is not sufficient to compute a navigation solution; and

code to obtain a second portion of information subsequent to the first epoch, which enables use of the stored first portion of information in computing the navigation solution, the second portion of information comprising position information from at least one source among the one or more sources.