METHOD OF ENHANCED COLD START AND ASSOCIATED USER INTERFACE FOR NAVIGATIONAL RECEIVERS

• US 20080048910A1
• Filed: 08/24/2006
• Published: 02/28/2008
• Est. Priority Date: 08/24/2006
• Status: Active Grant

• Current Assignee: CSR Technology Holdings Inc. (Qualcomm, Inc.)
• Original Assignee: SiRF Technology Holdings Incorporated (Qualcomm, Inc.)
• Inventors: Wang, David J., Leung, Henry
• Granted Patent: US 7,710,318 B2
• Time in Patent Office: Days
• US Class Current: 342/357.15
• CPC Class Codes: G01S 19/252 Employing an initial estimate of location in generating assistance data

Abstract

The present invention provides systems and methods for reducing the ‘cold start’ TTFF of navigation receivers. The systems and methods receive geographical information from a user, such as the nearest city, state or country, and use this geographical information to approximate the position of the receiver. The systems and methods then make use of the approximate position to reduce the ‘cold start’ TTFF. In an embodiment, the approximate position of the receiver is determined from a co-ordinate database in the receiver based on the geographical information provided by the user. In another embodiment, a user provides geographical information to the receiver through a displayed map with several stages of zooming capability.

Claims

1. A method for reducing the start time of a navigational receiver, comprising:

receiving approximate signal acquisition aiding parameters from a user; and

using the approximate signal acquisition aiding parameters to acquire navigation satellite signals.

2. The method of claim 1, wherein the parameters include an approximate geographical location of the receiver.

3. The method of claim 1, wherein the parameters include an approximate time of day.

4. The method of claim 1, wherein the parameters include an approximate geographical location of the receiver and an approximate time of day.

5. The method of claim 1, wherein the receiver includes a database of geographical locations and corresponding co-ordinates, further comprising:

having the user select a geographical location from the database; and

using the co-ordinates in the database for the selected geographical location as an approximate location of the receiver to acquire the navigation satellite signals.

6. The method of claim 5, wherein the geographical location is a city.

7. The method of claim 5, wherein the geographical location is a state or province and the corresponding co-ordinates in the database is a geographic center of the state or province.

8. The method of claim 5, wherein the geographical location is a country and the corresponding co-ordinates in the database is a geographic center of the country.

9. The method of claim 5, wherein the geographical location is a point or area on the surface of the earth with associated co-ordinates.

10. The method of claim 2, wherein the user selects the approximate geographical location from a database.

11. The method of claim 10, wherein the database includes a database of cities.

12. The method of claim 10, wherein the database includes a database of states or provinces.

13. The method of claim 10, wherein the database includes a database of locations or areas on the surface of the earth.

14. The method of claim 2, wherein the user selects the approximate geographical location from a displayed map.

15. The method of claim 14, wherein the receiver enables the user to zoom in a selected area of the map to improve accuracy of the location selection.

16. The method of claim 14, wherein the map is displayed on a touch screen and the user pinpoints the location on the map by touching the touch screen.

17. The method of claim 14, wherein the user uses a track ball to pinpoint the location on the map.

18. A navigational receiver, comprising:

a user interface;

satellite signal receiver section; and

a processor coupled to the satellite signal receiving section and the user interface, wherein the processor is configured to receive approximate signal acquisition aiding parameters from a user via the user interface, and use the approximate signal acquisition aiding parameters to acquire satellite signals from the satellite signal receiver section.

19. The navigational receiver of claim 18, wherein the parameters include an approximate geographical location of the receiver.

20. The navigational receiver of claim 18, wherein the parameters include an approximate time of day.

21. The navigational receiver of claim 18, wherein the parameters include an approximate geographical location of the receiver and an approximate time of day.

22. The navigational receiver of claim 18, further comprising a database of geographical locations and corresponding co-ordinates, wherein the processor is configure to receive a geographical location selected by a user from the database, and use the co-ordinates in the database for the selected geographical location as an approximate location of the receiver to acquire the satellite signals.

23. The navigational receiver of claim 22, wherein the geographical location is a city.

24. The navigational receiver of claim 22, wherein the geographical location is a state or province and the corresponding co-ordinates in the database is a geographic center of the state or province.

25. The navigational receiver of claim 22, wherein the geographical location is a country and the corresponding co-ordinates in the database is a geographic center of the country.

26. The navigational receiver of claim 22, wherein the geographical location is a point or area on the surface of the earth with associated co-ordinates.

27. The navigational receiver of claim 19, further comprises a database of geographic locations, wherein the user selects the approximate geographical location from the database.

28. The navigational receiver of claim 27, wherein the database includes a database of cities.

29. The navigational receiver of claim 27, wherein the database includes a database of states or provinces.

30. The navigational receiver of claim 27, wherein the database includes a database of locations or areas on the surface of the earth.

31. The navigational receiver of claim 19, wherein the user interface includes a display, and the receiver enables the user selects the approximate geographical location from a map on the display.

32. The navigational receiver of claim 31, wherein the receiver enables the user to zoom in a selected area of the map to improve accuracy of the location selection.

33. The navigational receiver of claim 31, wherein the user interface includes a touch screen, and the receiver enables the user to pinpoint the location on the map by touching the touch screen.

34. The navigational receiver of claim 31, wherein the user interface includes a track ball, and the receiver enables the user to pinpoint the location on the map using the track ball.