Culled satellite ephemeris information based on limiting a span of an inverted cone for locating satellite in-range determinations

• US 20060114153A1
• Filed: 11/21/2005
• Published: 06/01/2006
• Est. Priority Date: 10/15/2004
• Status: Active Grant

• Current Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Original Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Inventors: Pitt, Lance Douglas, Lamprecht, Leslie Johann, Martin, Jeffrey Thomas
• Granted Patent: US 7,091,905 B2
• Time in Patent Office: Days
• US Class Current: 342/357.420
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/28 Satellite selection

Abstract

Locating satellites (e.g., GPS) are culled into a sub-plurality based largely on dwell time within an inverted cone above a relevant site in communication with a wireless device. A first inverted cone having a first base angle is defined above a first site, a second inverted cone having a second base angle is defined above a second site. If the second site is farther from an equator of Earth than the first site, then the second inverted cone is made to have a base angle larger than a base angle of the first inverted cone. If the first site is farther from the equator of Earth than the second site, then the first inverted cone is made to have a base angle larger than a base angle of the second inverted cone. The span of the inverted cone over the site closest to the equator may be limited.

Claims

1-22. -22. (canceled)

23. A method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices, comprising:

defining a first inverted conical shape corresponding to a first point, said first inverted conical shape having a first average base angle; and

defining a second inverted conical shape corresponding to a second point, said second inverted conical shape having a second average base angle;

wherein if said second point is farther from an equator of Earth than said first point, then said second inverted conical shape is made to have an average base angle larger than an average base angle of said first inverted conical shape; and

if said first point is farther from said equator of Earth than said second point, then said first inverted conical shape is made to have an average base angle larger than an average base angle of said second inverted conical shape.

24. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein:

said first inverted conical shape is circular in cross section.

25. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein:

said first inverted conical shape is non-circular in cross section.

26. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein said airborne positioning devices each comprise:

a satellite.

27. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein said airborne positioning devices each comprise:

a GPS satellite.

28. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein said plurality of wireless devices include:

GPS-enabled mobile technology.

29. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein said plurality of wireless devices include:

wireless personal digital assistants (PDAs).

30. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein said plurality of wireless devices include:

location enabled laptop computers.

31. The method of culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 23, wherein:

said first point comprises at least one of a base station and a cell phone; and

said second point comprises at least one of a base station and a cell phone.

32. Apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices, comprising:

means for defining a first inverted conical shape corresponding to a first point, said first inverted conical shape having a first average base angle; and

means for defining a second inverted conical shape above a second point, said second inverted conical shape having a second average base angle;

wherein if said second point is farther from an equator of Earth than said first point, then said means for defining said second inverted conical shape defines said second inverted conical shape to have an average base angle larger than an average base angle of said first inverted conical shape; and

if said first point is farther from said equator of Earth than said second point, then said means for defining said first inverted conical shape defines said first inverted conical shape to have an average base angle larger than an average base angle of said second inverted conical shape.

33. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein:

said first inverted conical shape is circular in cross section.

34. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein:

said first inverted conical shape is non-circular in cross section.

35. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein said airborne positioning devices each comprise:

a GPS satellite.

36. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein said plurality of wireless devices include:

GPS-enabled mobile technology.

37. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein said plurality of wireless devices include:

wireless personal digital assistants (PDAs).

38. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein said plurality of wireless devices include:

location enabled laptop computers.

39. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 32, wherein:

said first point comprises at least one of a base station and a cell phone; and

said second point comprises at least one of a base station and a cell phone.

40. Apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices, comprising:

means for defining a first inverted conical shape above a first point, said first inverted conical shape having a first average base angle;

means for defining a second inverted conical shape above a second point, said second inverted conical shape having a second average base angle; and

means for defining a third inverted conical shape above a third point, said third inverted conical shape having a third average base angle;

wherein if said second point is farther from an equator of Earth than said first point, then said second inverted conical shape is made to have an average base angle larger than an average base angle of said first inverted conical shape; and

if said first point is farther from said equator of Earth than said second point, then said first inverted conical shape is made to have an average base angle larger than an average base angle of said second inverted conical shape.

41. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein:

said first inverted conical shape is circular in cross section.

42. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein:

said first inverted conical shape is non-circular in cross section.

43. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein said airborne positioning devices each comprise:

a GPS satellite.

44. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein said plurality of wireless devices include:

GPS-enabled mobile technology.

45. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein said plurality of wireless devices include:

wireless personal digital assistants (PDAs).

46. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein said plurality of wireless devices include:

location enabled laptop computers.

47. The apparatus for culling a plurality of locating airborne positioning devices into a sub-plurality for communication by a plurality of wireless devices according to claim 40, wherein:

said first point comprises at least one of a base station and a cell phone; and

said second point comprises at least one of a base station and a cell phone.