ASSISTED SATELLITE SIGNAL BASED POSITIONING

• US 20100090895A1
• Filed: 09/21/2006
• Published: 04/15/2010
• Est. Priority Date: 09/21/2006
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Wirola, Lauri, Syrjarinne, Jari
• Granted Patent: US 8,310,396 B2
• Time in Patent Office: Days
• US Class Current: 342/357.63
• CPC Class Codes: G01S 19/05 providing aiding data

Abstract

For assisting a satellite based positioning, parameters are received for at least one satellite. Redundant information is removed from these parameters at large. Parameters with reduced redundancy are then provided as assistance data for the satellite signal based positioning. Such parameters with reduced redundancy can be received on the other hand as assistance data for a satellite signal based positioning. The original parameters are then reconstructed by adding the removed redundant information to the received parameters. The reconstructed original parameters are used in an assisted satellite signal based positioning.

Claims

1. A method comprising:

receiving parameters for at least one satellite;

removing redundant information from at least one of said parameters; and

providing parameters with reduced redundancy as assistance data for a satellite signal based positioning.

2. The method according to claim 1, wherein removing redundant information from at least one of said parameters comprises determining a common part and a respective individual part for a plurality of parameters and wherein said common part is provided only once for said plurality of parameters as assistance data.

10. The method according to claim 1, wherein said parameters comprise almanac parameters for a plurality of satellites, said almanac parameters including almanac reference time information for each of said satellites, and wherein removing redundant information from at least one of said parameters comprises defining a common part including at least a part of said reference time information, wherein said common part is provided only once for said plurality of satellites as assistance data.

27. A computer program product in which a computer program code is stored in a computer readable medium, which computer program code realizes the method of claim 1 when executed by a processor.

3-9. -9. (canceled)

11-12. -12. (canceled)

13. An apparatus comprising a processor,

said processor being configured to receive parameters for at least one satellite;

said processor being configured to remove redundant information from at least one of said parameters; and

said processor being configured to provide parameters with reduced redundancy as assistance data for a satellite signal based positioning.

14. The apparatus according to claim 13, wherein said processor is configured to remove redundant information from at least one of said parameters by determining a common part and a respective individual part for a plurality of parameters and wherein said processor is configured to provide said common part only once for said plurality of parameters as assistance data.

15. The apparatus according to claim 14, wherein said processor is configured to determine, in case said parameters comprise parameters for satellites belonging to at least two different satellite systems, a common part for parameters for satellites belonging to at least two different satellite systems and in addition, optionally, a respective common part for parameters for satellites belonging to a single satellite system.

20. The apparatus according to claim 13, wherein said parameters comprise a respective satellite identification parameter for a plurality of satellites, wherein said satellite identification parameters are bit representations of ordinal numbers and wherein said processor is configured to remove redundant information from at least one of said parameters by converting said plurality of bit representations of said ordinal numbers into a bit mask representation of said ordinal numbers.

21. The apparatus according to claim 13, wherein said parameters comprise a respective satellite identification parameter for a plurality of satellites and wherein said processor is configured to remove redundant information from at least one of said parameters by reducing a bit count of said plurality of satellite identification parameters by removing a predetermined offset in said satellite identification parameters.

22. The apparatus according to claim 13, wherein said parameters comprise almanac parameters for a plurality of satellites, said almanac parameters including almanac reference time information for each of said satellites, and wherein said processor is configured to remove redundant information from at least one of said parameters by defining a common part including at least a part of said reference time information, wherein said common part is provided only once for said plurality of satellites as assistance data.

25. The apparatus according to claim 13, further comprising at least one of:

a wireless communication component configured to transmit information via a wireless link; and

a satellite signal receiver.

16-19. -19. (canceled)

23-24. -24. (canceled)

26. (canceled)

28. A method comprising:

receiving parameters as assistance data for a satellite signal based positioning, wherein said received parameters are based on original parameters for at least one satellite, from at least one of which original parameters redundant information has been removed;

reconstructing said original parameters by adding said removed redundant information to said received parameters; and

using said reconstructed original parameters in an assisted satellite signal based positioning.

29. The method according to claim 28, wherein reconstructing said original parameters comprises adding at least one common part received in said assistance data for a plurality of original parameters to a respective individual part received in said assistance data for a plurality of original parameters.

41. A computer program product in which a computer program code is stored in a computer readable medium, which computer program code realizes the method of claim 28 when executed by a processor.

30-32. -32. (canceled)

33. An apparatus comprising a processor,

said processor being configured to receive parameters as assistance data for a satellite signal based positioning, wherein said received parameters are based on original parameters for at least one satellite, from at least one of which original parameters redundant information has been removed;

said processor being configured to reconstruct said original parameters by adding said removed redundant information to said received parameters; and

said processor being configured to use said reconstructed original parameters in an assisted satellite signal based positioning.

34. The apparatus according to claim 33, wherein said processor is configured to reconstruct said original parameters by adding at least one common part received in said assistance data for a plurality of original parameters to a respective individual part received in said assistance data for a plurality of original parameters.

35. The apparatus according to claim 33, wherein said plurality of original parameters comprises at least one of:

a plurality of eccentricity parameters;

a plurality of semi-major axis parameters; and

a plurality of time parameters indicating a respective point in time.

39. The apparatus according to claim 33, further comprising at least one of:

a wireless communication component configured to receive information via a wireless link; and

a satellite signal receiver.

36-38. -38. (canceled)

40. (canceled)

42. (canceled)