Positioning using a reference station

• US 8,686,901 B2
• Filed: 05/18/2007
• Issued: 04/01/2014
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Wirola, Lauri, Syrjrinne, Jari
• Primary Examiner(s): GALT, CASSI J
• Application Number:
  US12/451,469
• Publication Number:
  US 20100090890A1
• Time in Patent Office: 2,510 Days
• Field of Search: 342/357.04, 342/357.27, 342/357.72
• US Class Current: 342/357.27
• CPC Class Codes: G01S 19/04 providing carrier phase data
• CPC Class Codes: G01S 19/44 Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method

Abstract

For supporting a change of a reference station, first data that is valid for a first reference station is provided for transmission to a device, then data that is valid for the first reference station and data that is valid for a second reference station is provided for transmission to the device in parallel for a limited time, and finally data that is valid for the second reference station is provided for transmission to the device. The data for the first reference station and the data for the second reference station include measurements on satellite signals. At a receiving end, the respectively received data can be provided for a positioning of a device comprising a satellite signal receiver.

Claims

1. A method comprising:

using, by an apparatus, received measurements on satellite signals that are valid for a first reference station and data provided by a satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the first reference station and for tracking the baseline between the satellite signal receiver and the first reference station; and

performing, by the apparatus, a change of reference station by

using measurements on satellite signals that are valid for the first reference station and measurements on satellite signals that are valid for a second reference station, which have been received in parallel for a limited time for supporting the change of reference station, and data provided by the satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the second reference station under consideration of a baseline between the first reference station and the second reference station, and by

using received measurements on satellite signals that are valid for the second reference station, data provided by the satellite signal receiver and the solved integer ambiguities for a baseline between the satellite signal receiver and the second reference station for tracking the baseline between the satellite signal receiver and the second reference station.

2. The method according to claim 1, wherein the measurements on satellite signals comprise carrier-phase measurements on satellite signals.

3. The method according to claim 1, wherein the first reference station and the second reference station are virtual reference stations.

4. The method according to claim 1, further comprising storing data including received measurements on satellite signals that are valid for the first reference station and data including received measurements on satellite signals that are valid for the second reference station together with data including measurements on satellite signals received by the satellite signal receiver.

5. The method according to claim 1, further comprising using the received measurements on satellite signals data in a real time or near real time positioning of a device comprising the satellite signal receiver.

17. The method according to claim 1, wherein at least for some time before the limited time, measurements on satellite signals that are valid for the second reference station have not been received by the apparatus;

and wherein at least for some time after the limited time, measurements on satellite signals that are valid for the first reference station are no longer received by the apparatus.

6. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to cause the apparatus at least to perform:

using received measurements on satellite signals that are valid for a first reference station and data provided by a satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the first reference station and for tracking the baseline between the satellite signal receiver and the first reference station; and

performing a change of reference station by

using measurements on satellite signals that are valid for the first reference station and measurements on satellite signals that are valid for a second reference station, which have been received in parallel for a limited time for supporting the change of reference station, and data provided by the satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the second reference station under consideration of a baseline between the first reference station and the second reference station; and

by

using received measurements on satellite signals that are valid for the second reference station, data provided by the satellite signal receiver and the solved integer ambiguities for a baseline between the satellite signal receiver and the second reference station for tracking the baseline between the satellite signal receiver and the second reference station.

7. The apparatus according to claim 6, wherein the measurements on satellite signals comprise carrier-phase measurements on satellite signals.

8. The apparatus according to claim 6, wherein the first reference station and the second reference station are virtual reference stations.

9. The apparatus according to claim 6, wherein the at least one memory and the computer program code are further configured to cause the apparatus to perform:

store data including received measurements on satellite signals that are valid for the first reference station and data including received measurements on satellite signals that are valid for the second reference station together with data including measurements on satellite signals received by the satellite signal receiver.

10. The apparatus according to claim 6, wherein the at least one memory and the computer program code are further configured to cause the apparatus to use the provided data in a real time or near real time positioning of a device comprising the satellite signal receiver.

11. The apparatus according to claim 6, further comprising:

a user interface.

12. The apparatus according to claim 6, further comprising a wireless communication component configured to enable a communication with another device.

13. The apparatus according to claim 6, further comprising the satellite signal receiver.

14. The apparatus according to claim 6, wherein the apparatus is a wireless communication terminal.

16. A system comprising:

a first apparatus according to claim 6; and

a second apparatus with at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to cause the second apparatus at least to perform;

provide measurements on satellite signals that are valid for a first reference station for transmission to the first apparatus;

provide in parallel for a limited time measurements on satellite signals that are valid for the first reference station and measurements on satellite signals that are valid for a second reference station for transmission to the first apparatus; and

provide measurements on satellite signals that are valid for the second reference station for transmission to the first apparatus.

18. The apparatus according to claim 6, wherein at least for some time before the limited time, measurements on satellite signals that are valid for the second reference station have not been received by the apparatus;

and wherein at least for some time after the limited time, measurements on satellite signals that are valid for the first reference station are no longer received by the apparatus.

15. A non-transitory computer readable storage medium in which computer program code is stored, the computer program code causing an apparatus to realize the following when executed by a processor:

using received measurements on satellite signals that are valid for a first reference station and data provided by a satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the first reference station and for tracking the baseline between the satellite signal receiver and the first reference station; and

performing a change of reference station by

using measurements on satellite signals that are valid for the first reference station and measurements on satellite signals that are valid for a second reference station, which have been received in parallel for a limited time for supporting the change of reference station, and data provided by the satellite signal receiver for solving integer ambiguities for a baseline between the satellite signal receiver and the second reference station under consideration of a baseline between the first reference station and the second reference station; and

by

using received measurements on satellite signals that are valid for the second reference station, data provided by the satellite signal receiver and the solved integer ambiguities for a baseline between the satellite signal receiver and the second reference station for tracking the baseline between the satellite signal receiver and the second reference station.