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06/11/09 - USPTO Class 342 | 17 views | #20090146878 | Prev - Next | About this Page

System and method for position calculation of a mobile device

Title: System and method for position calculation of a mobile device

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20090146878, System and method for position calculation of a mobile device.

What we claim is:

1. A method for determining a location of a device, the method comprising: (a) receiving at said device plural signals from a first plurality of satellites; (b) determining a first estimated location of said device as a function of frequency information from said signals; (c) determining a second plurality of satellites as a function of said first estimated location; (d) transmitting assistance data to said device, said assistance data including information from said second plurality of satellites; and (e) determining a second estimated location of said device from said information from said second plurality of satellites.

2. The method of claim 1 further comprising the step of determining a third estimated location of said device as a function of phase information from said signals.

3. The method of claim 1 wherein said first plurality of satellites is at least four.

4. The method of claim 1 wherein the satellites are part of a Global Navigation Satellite System (“GNSS”).

5. The method of claim 4 wherein the GNSS is selected from the group consisting of: Global Positioning System (“GPS”), Galileo, Global Navigation Satellite System (“GLONASS”), and Quasi-Zenith Satellite System (“QZSS”).

6. The method of claim 1 wherein the device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.

7. The method of claim 1 wherein said first estimated location is determined as a function of coordinates for origin in an Earth-Centered Earth-fixed (“ECEF”) coordinate system.

8. The method of claim 1 wherein said first and second plurality of satellites are mutually exclusive.

9. The method of claim 1 wherein said frequency information includes Doppler shift information.

10. The method of claim 2 wherein said phase information includes coarse acquisition (“C/A”) code phase information.

11. A system for determining the location of a device from signals received from a plurality of Global Navigation Satellite System (“GNSS”) satellites comprising: (a) a receiver for receiving plural signals from a first plurality of satellites; (b) circuitry for determining a first estimated location of said device as a function of frequency information from said signals; (c) circuitry for determining a second plurality of satellites as a function of said first estimated location; (d) a transmitter for transmitting assistance data to said device, said assistance data including information from said second plurality of satellites; and (e) circuitry for determining a second estimated location of said device from said information from said second plurality of satellites.

12. The system of claim 11 further comprising circuitry for determining a third estimated location of said device as a function of phase information from said signals.

13. The system of claim 11 wherein said first plurality of satellites is at least four.

14. The system of claim 11 wherein the GNSS is selected from the group consisting of: Global Positioning System (“GPS”), Galileo, Global Navigation Satellite System (“GLONASS”), and Quasi-Zenith Satellite System (“QZSS”).

15. The system of claim 11 wherein the device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.

16. The system of claim 11 wherein said first estimated location is a function of coordinates for origin in an Earth-Centered Earth-fixed (“ECEF”) coordinate system.

17. The system of claim 11 wherein said first and second plurality of satellites are mutually exclusive.

18. The system of claim 11 wherein said frequency information includes Doppler shift information.

19. The system of claim 12 wherein said phase information includes coarse acquisition (“C/A”) code phase information.

20. A method for determining a location of a device, the method comprising: (a) receiving at said device plural signals from a first plurality of satellites; (b) determining a first estimated location of said device as a function of frequency information from said signals; (c) determining a second estimated location of said device as a function of said first estimated location and as a function of phase information from said signals; (d) determining a second plurality of satellites as a function of said first or second estimated location; (e) transmitting assistance data to said device, said assistance data including information from said second plurality of satellites; and (f) determining a third estimated location of said device from said information from said second plurality of satellites.

21. The method of claim 20 wherein said first plurality of satellites is at least four.

22. The method of claim 20 wherein the satellites are part of a Global Navigation Satellite System (“GNSS”).

23. The method of claim 22 wherein the GNSS is selected from the group consisting of: Global Positioning System (“GPS”), Galileo, Global Navigation Satellite System (“GLONASS”), and Quasi-Zenith Satellite System (“QZSS”).

24. The method of claim 20 wherein the device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.

25. The method of claim 20 wherein said first estimated location is determined as a function of coordinates for origin in an Earth-Centered Earth-fixed (“ECEF”) coordinate system.

26. The method of claim 20 wherein said first and second plurality of satellites are mutually exclusive.

27. The method of claim 20 wherein said frequency information includes Doppler shift information.

28. The method of claim 20 wherein said phase information includes coarse acquisition (“C/A”) code phase information.

Brief Patent Description - Full Patent Description - Patent Claims

Click on the above for other options relating to this System and method for position calculation of a mobile device patent application.

Patent Applications in related categories:

20090284413 - Mobile device comprising a gps receiver - A mobile device comprising a GPS receiver for receiving GPS signals; a communications receiver for receiving historical ephemeris data from an external server; and a processor configured to determine later ephemeris data from the historical ephemeris data and to determine a GPS position fix from the later ephemeris data. In ...

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Previous Patent Application:
System and method for a-gps positioning of a mobile device
Next Patent Application:
System and method for preventing a-gps devices from searching for specific satellites
Industry Class:
Communications: directive radio wave systems and devices (e.g., radar, radio navigation)

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