Extracting pseudorange information using a cellular device

• US 9,369,843 B2
• Filed: 09/24/2013
• Issued: 06/14/2016
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Rudow, Richard, Wold, Robert, Kasirajan, Venkateswaran, Talbot, Nicholas C., Loomis, Peter Van Wyck, Janky, James M.
• Primary Examiner(s): Hong, Dung
• Application Number:
  US14/035,884
• Publication Number:
  US 20150289097A1
• Time in Patent Office: 994 Days
• Field of Search: 455/405, 4554561-4566, 455/457, 342/357.22, 342/357.24, 342/357.44
• US Class Current: 1/1
• CPC Class Codes: G01S 19/25 involving aiding data received from a cooperating element, e.g. assisted GPS
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]
• CPC Class Codes: G01S 19/43 using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver
• CPC Class Codes: H04M 3/00 Automatic or semi-automatic exchanges
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

Pseudorange information is extracted by a cellular device from a Global Navigation Satellite System (GNSS) chipset of the cellular device. The cellular device accesses the GNSS chipset embedded within the cellular device where the GNSS chipset calculates pseudorange information for use by the GNSS chipset. The cellular device extracts the pseudorange information from the GNSS chipset for use elsewhere in the cellular device outside of the GNSS chipset.

Claims

1. A method of extracting pseudorange information using a cellular device, the method comprising:

accessing a Global Navigation Satellite System (GNSS) chipset embedded within the cellular device, wherein the GNSS chipset calculates pseudorange information for use by the GNSS chipset;

extracting the pseudorange information from the GNSS chipset for use elsewhere in the cellular device outside of the GNSS chipset, wherein the accessing and the extracting are performed by the cellular device that includes hardware;

obtaining carrier phase information from the GNSS chipset, wherein the carrier phase information is real carrier phase information and wherein the obtaining of the carrier phase information further comprises extracting carrier phase measurements from the GNSS chipset, and deriving the real carrier phase information, external to the GNSS chipset, based on the extracted carrier phase measurements; and

storing the carrier phase information in memory located in the cellular device and outside of the GNSS chipset.

2. The method as recited by claim 1, wherein the method further comprises:

providing smoothed pseudorange information by performing pseudorange smoothing on the extracted pseudorange information using the carrier phase information, wherein said pseudorange smoothing is performed external to the GNSS chipset.

3. The method as recited by claim 2, wherein the method further comprises:

accessing the smoothed pseudorange information at pseudorange information processing logic resident in the cellular device; and

determining a position fix, external to the GNSS chipset, based on the smoothed pseudorange information.

4. The method as recited by claim 2, wherein the method further comprises:

obtaining Wide Area Augmentation System (WAAS) pseudorange corrections; and

storing the WAAS pseudorange corrections in memory located in the cellular device and outside of the GNSS chipset.

5. The method as recited by claim 4, wherein the method further comprises:

accessing the smoothed pseudorange information and the WAAS pseudorange corrections at pseudorange information processing logic resident in the cellular device; and

determining a position fix, external to the GNSS chipset, based on the smoothed pseudorange information and the WAAS pseudorange corrections.

6. The method as recited by claim 2, wherein the method further comprises:

obtaining Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source.

7. The method as recited by claim 6, wherein the method further comprises:

providing DGPS corrected smoothed pseudoranges by applying the DGPS pseudorange corrections to the smoothed pseudorange information.

8. The method as recited by claim 7, wherein the method further comprises:

obtaining Wide Area Augmentation System (WAAS) pseudorange corrections;

providing the DGPS corrected smoothed pseudoranges and the WAAS pseudorange corrections to the pseudorange information processing logic; and

determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges and the WAAS pseudorange corrections.

9. The method as recited by claim 7, wherein the method further comprises:

accessing the DGPS corrected smoothed pseudoranges at the pseudorange information processing logic; and

determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges.

10. The method as recited by claim 6, wherein the method further comprises:

obtaining Precise Point Positioning (PPP) corrections.

11. The method as recited by claim 10, wherein the method further comprises:

if a distance between the cellular device and a nearest reference station is less than or equal to a distance threshold, providing corrected smoothed pseudoranges by applying the DGPS pseudorange corrections to the smoothed pseudorange information, wherein the applying of the DGPS pseudorange corrections is accomplished external to the GNSS chipset; and

if the distance is greater than the distance threshold, providing corrected smoothed pseudoranges by applying different pseudorange corrections to the smoothed pseudorange information, wherein the different pseudorange corrections is selected from a group consisting of SBAS corrections, WAAS corrections, RTX corrections and PPP corrections, wherein the applying of the different pseudorange corrections is accomplished external to the GNS chipset.

12. The method as recited by claim 11, wherein the method further comprises:

if the corrected smoothed pseudoranges are DGPS corrected smoothed pseudoranges, then

accessing the DGPS corrected smoothed pseudoranges and the PPP corrections at pseudorange information processing logic, wherein the PPP corrections are orbit-clock errors; and

determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges and the PPP corrections.

13. The method as recited by claim 1, wherein the method further comprises:

storing the extracted pseudorange information in memory located in the cellular device and outside of the GNSS chipset.

14. The method as recited by claim 13, wherein the method further comprises:

accessing the extracted pseudorange information at pseudorange information processing logic resident in the cellular device; and

determining a position fix, external to the GNSS chipset, based on the extracted pseudorange information.

15. The method as recited by claim 14, wherein the method further comprises:

obtaining Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source.

16. The method as recited by claim 15, wherein the method further comprises:

accessing the extracted pseudorange information and the DGPS pseudorange corrections at the pseudorange information processing logic; and

determining a position fix, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information.

17. The method as recited by claim 14, wherein the method further comprises:

obtaining Wide Area Augmentation System (WAAS) pseudorange corrections; and

storing the WAAS pseudorange corrections in memory located in the cellular device and outside of the GNSS chipset.

18. The method as recited by claim 17, wherein the method further comprises:

obtaining Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source.

19. The method as recited by claim 18, wherein the method further comprises:

accessing the extracted pseudorange information and the DGPS pseudorange corrections at pseudorange information processing logic resident at the cellular device;

determining DGPS corrected unsmoothed pseudoranges, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information;

accessing the WAAS pseudorange corrections at the pseudorange information processing logic; and

determining a position fix, external to the GNSS chipset, based on the DGPS corrected unsmoothed pseudoranges and the WAAS pseudorange corrections.

20. The method as recited by claim 13, wherein the method further comprises:

obtaining Precise Point Positioning (PPP) corrections; and

storing the PPP corrections in memory located in the cellular device and outside of the GNSS chipset.

21. The method as recited by claim 20, wherein the method further comprises:

obtaining Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source.

22. The method as recited by claim 21, wherein the method further comprises:

accessing the extracted pseudorange information and the DGPS pseudorange corrections at pseudorange information processing logic resident at the cellular device;

determining DGPS corrected unsmoothed pseudoranges, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information;

accessing the DGPS corrected unsmoothed pseudoranges and the PPP corrections at pseudorange information processing logic; and

determining a position fix, external to the GNSS chipset, based on the DGPS corrected unsmoothed pseudoranges and the PPP corrections.

23. A non-transitory computer readable storage medium having computer readable instructions stored thereon for causing a computer system to perform a method of extracting pseudorange information using a cellular device, the method comprising:

accessing a Global Navigation Satellite System (GNSS) chipset embedded within the cellular device, wherein the GNSS chipset calculates pseudorange information for use by the GNSS chipset;

extracting the pseudorange information from the GNSS chipset for use elsewhere in the cellular device outside of the GNSS chipset, wherein the accessing and the extracting are performed by the cellular device;

obtaining carrier phase information from the GNSS chipset, wherein the carrier phase information is real carrier phase information and wherein the obtaining of the carrier phase information further comprises extracting carrier phase measurements from the GNSS chipset, and deriving the real carrier phase information, external to the GNSS chipset, based on the extracted carrier phase measurements; and

storing the carrier phase information in memory located in the cellular device and outside of the GNSS chipset.

24. The non-transitory computer readable storage medium as recited by claim 23, wherein the method further comprises:

smoothing the extracted pseudorange information.

25. The non-transitory computer readable storage medium as recited by claim 24, wherein the smoothing further comprises smoothing the extracted pseudorange information based on the carrier phase information.

26. The non-transitory computer readable storage medium as recited by claim 24, wherein the method further comprises:

correcting the smoothed pseudorange information.

27. The non-transitory computer readable storage medium as by claim 26, wherein the correcting of the smoothed pseudorange information further comprises providing corrected pseudoranges by correcting the smoothed pseudorange information, wherein the corrected pseudoranges are pseudoranges that were corrected based on one or more types of pseudorange corrections selected from a group consisting of satellite-based augmentation system (SBAS), Wide Area Augmentation System (WAAS), Differential Global Positioning System (DGPS), Precise Point Positioning (PPP), Real Time Kinematic (RTK), and RTX.

28. The non-transitory computer readable storage medium as recited by claim 23, wherein the method further comprises:

accessing, performed by the cellular device outside of the GNSS chipset, pseudorange corrections; and

deriving, performed by the cellular device outside of the GNSS chipset, the corrected pseudoranges by applying the pseudorange corrections to the extracted pseudorange information.

29. The non-transitory computer readable storage medium as recited by claim 28, wherein the deriving the corrected pseudoranges further comprises deriving corrected pseudoranges that are pseudoranges that were corrected based on one or more types of pseudorange corrections selected from a group consisting of satellite-based augmentation system (SBAS), Wide Area Augmentation System (WAAS), Differential Global Positioning System (DGPS), Precise Point Positioning (PPP), Real Time Kinematic (RTK) and RTX.

30. The non-transitory computer readable storage medium as recited by claim 23, wherein the method further comprises:

determining whether to apply any improvements to the extracted pseudorange information; and

if the determination is to apply any improvements, determining one or more improvements to be applied to the extracted pseudorange information.

31. A system for extracting pseudorange information using a cellular device, the system comprising:

a chipset accessor for accessing a Global Navigation Satellite System (GNSS) chipset embedded within the cellular device, wherein the GNSS chipset calculates pseudorange information for use by the GNSS chipset;

a pseudorange information extractor for extracting the pseudorange information from the GNSS chipset for use elsewhere in the cellular device outside of the GNSS chipset, wherein the accessing and the extracting are performed by the cellular device that includes hardware;

carrier phase measurement extracting logic for extracting carrier phase measurements from the GNSS chipset;

real carrier phase logic for deriving real carrier phase information, external to the GNSS chipset, based on the extracted carrier phase measurements; and

memory for storing the real carrier phase information in the memory, wherein the memory is located in the cellular device and outside of the GNSS chipset.

32. The system as recited by claim 31, wherein the system further comprises:

Doppler extracting logic for extracting Doppler shift data from the GNSS chipset;

reconstructed carrier phase logic for deriving reconstructed carrier phase information, external to the GNSS chipset, based on the extracted Doppler shift data; and

memory for storing the reconstructed carrier phase information in the memory, wherein the memory is located in the cellular device and outside of the GNSS chipset.

33. The system as recited by claim 31, wherein the system further comprises:

smoothing logic for providing smoothed pseudorange information by performing pseudorange smoothing on the extracted pseudorange information using the carrier phase information, wherein said pseudorange smoothing is performed external to the GNSS chipset.

34. The system as recited by claim 33, wherein the system further comprises:

pseudorange information processing logic for accessing the smoothed pseudorange information; and

determining position fix logic for determining a position fix, external to the GNSS chipset, based on the smoothed pseudorange information.

35. The system as recited by claim 33, wherein the system further comprises:

accessing logic for accessing Wide Area Augmentation System (WAAS) pseudorange corrections, wherein the WAAS pseudorange corrections are for use elsewhere in the cellular device outside of the GNSS chipset;

memory for storing the WAAS pseudorange corrections in the memory, wherein the memory is located in the cellular device and outside of the GNSS chipset;

pseudorange information processing logic for accessing the smoothed pseudorange information and the WAAS pseudorange corrections, wherein the pseudorange information processing logic is resident in the cellular device; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the smoothed pseudorange information and the WAAS pseudorange corrections.

36. The system as recited by claim 33, wherein the system further comprises:

receiving logic for receiving Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source; and

correcting logic for providing DGPS corrected smoothed pseudoranges by applying the DGPS pseudorange corrections to the smoothed pseudorange information.

37. The system as recited by claim 36, wherein the system further comprises:

accessing logic for accessing Wide Area Augmentation System (WAAS) pseudorange corrections;

pseudorange information processing logic for receiving the DGPS corrected smoothed pseudoranges and the WAAS pseudorange corrections; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges and the WAAS pseudorange corrections.

38. The system as recited by claim 36, wherein the system further comprises:

pseudorange information processing logic for accessing the DGPS corrected smoothed pseudoranges; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges.

39. The system as recited by claim 33, wherein the system further comprises:

receiving logic for receiving Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source; and

pseudorange information processing logic for providing DGPS corrected smoothed pseudoranges by applying the DGPS pseudorange corrections to the smoothed pseudorange information, wherein applying is accomplished external to the GNSS chipset.

40. The system as recited by claim 39, wherein the system further comprises:

the receiving logic for receiving Precise Point Positioning (PPP) corrections;

the pseudorange information processing logic for accessing the DGPS corrected smoothed pseudoranges and the PPP corrections; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the DGPS corrected smoothed pseudoranges and the PPP corrections.

41. The system as recited by claim 31, wherein the system further comprises:

memory for storing the extracted pseudorange information in the memory, wherein the memory is located in the cellular device and outside of the GNSS chipset;

pseudorange information processing logic for accessing the extracted pseudorange information, wherein the pseudorange information processing logic is resident in the cellular device; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the extracted pseudorange information.

42. The system as recited by claim 41, wherein the system further comprises:

receiving logic for receiving Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source;

the pseudorange information processing logic for accessing the extracted pseudorange information and the DGPS pseudorange corrections; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information.

43. The system as recited by claim 41, wherein the system further comprises:

accessing logic for accessing Wide Area Augmentation System (WAAS) pseudorange corrections; and

the memory for storing the WAAS pseudorange corrections in the memory, wherein the memory is located in the cellular device and outside of the GNSS chipset.

44. The system as recited by claim 43, wherein the system further comprises:

receiving logic for receiving Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source;

the pseudorange information processing logic for accessing the extracted pseudorange information and the DGPS pseudorange corrections, wherein the pseudorange information processing logic is resident at the cellular device;

the pseudorange information processing logic for determining DGPS corrected unsmoothed pseudoranges, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information;

the pseudorange information processing logic for accessing the WAAS pseudorange corrections; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the DGPS corrected unsmoothed pseudoranges and the WAAS pseudorange corrections.

45. The system as recited by claim 31, wherein the system further comprises:

receiving logic for receiving Precise Point Positioning (PPP) corrections;

the receiving logic for receiving Differential Global Positioning System (DGPS) pseudorange corrections from a local DGPS reference source;

pseudorange information processing logic for accessing the extracted pseudorange information and the DGPS pseudorange corrections, wherein the pseudorange information processing logic is resident at the cellular device;

the pseudorange information processing logic for determining DGPS corrected unsmoothed pseudoranges, external to the GNSS chipset, by applying the DGPS pseudorange corrections to the extracted pseudorange information;

the pseudorange information processing logic for accessing the DGPS corrected unsmoothed pseudoranges and the PPP corrections; and

the pseudorange information processing logic for determining a position fix, external to the GNSS chipset, based on the DGPS corrected unsmoothed pseudoranges and the PPP corrections.

46. The system as recited by claim 31, wherein the system further comprises:

smoothing logic for smoothing the extracted pseudorange information, wherein the smoothing logic is external to the GNSS chipset.

47. The system as recited by claim 46, wherein the smoothing logic smooths the extracted pseudorange information based on the real carrier phase information.

48. The system as recited by claim 46, wherein the system further comprises:

Doppler extracting logic for extracting Doppler shift data from the GNSS chipset;

reconstructed carrier phase logic for deriving reconstructed carrier phase information based on the extracted Doppler shift data; and

the reconstructed carrier phase logic for smoothing the extracted pseudorange information based on the reconstructed carrier phase information, wherein the Doppler extracting logic and the reconstructed carrier phase logic are external to the GNSS chipset.

49. The system as recited by claim 46, wherein the system further comprises:

correcting logic for correcting the smoothed pseudorange information, wherein the correcting logic is external to the GNSS chipset.

50. The system as recited by claim 49, wherein the corrected pseudoranges are pseudoranges that were corrected based on one or more types of pseudorange corrections selected from a group consisting of Wide Area Augmentation System (WAAS), Differential Global Positioning System (DGPS), Precise Point Positioning (PPP), Real Time Kinematic (RTK), and RTX.

51. The system as recited by claim 31, wherein the system further comprises:

accessing logic for accessing pseudorange corrections; and

pseudorange information processing logic for deriving the corrected pseudoranges by applying the pseudorange corrections to the extracted pseudorange information, wherein the accessing logic and the pseudorange information processing logic are external to the GNSS chipset.

52. The system as recited by claim 51, wherein the corrected pseudoranges are pseudoranges that were corrected based on one or more types of pseudorange corrections selected from a group consisting of Wide Area Augmentation System (WAAS), Differential Global Positioning System (DGPS), Precise Point Positioning (PPP), Real Time Kinematic (RTK) and RTX.

53. The system as recited by claim 31, wherein the system further comprises:

position accuracy improvement determination logic for determining whether to apply any improvements to the extracted pseudorange information, wherein the position accuracy improvement determination logic is external to the GNSS chipset; and

the position accuracy improvement determination logic for determining one or more improvements to be applied to the extracted pseudorange information, if the determination is that any improvements will be applied.