CULLED SATELLITE EPHEMERIS INFORMATION FOR QUICK, ACCURATE ASSISTED LOCATING SATELLITE LOCATION DETERMINATION FOR CELL SITE ANTENNAS

• US 20060082499A1
• Filed: 03/16/2005
• Published: 04/20/2006
• 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 7,019,690 B1
• Time in Patent Office: Days
• US Class Current: 342/357.420
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/28 Satellite selection

Abstract

Locating satellites (e.g., GPS) are culled into a preferred group having a longest dwell time based on a time passing through an ellipsoid arc path through a cone of space, and communicated to mobile devices within a particular region (e.g., serviced by a particular base station). The culled locating satellites may select those visible, or more preferably those locating satellites currently within a cone of space above the relevant base station are selected for communication by a mobile device within the service area of the base station. The inverted cone of space may be defined for each antenna structure for any given base station, and each has 360 degrees of coverage, or less than 360 degrees of coverage, with relevant locating satellites. Thus, cell sites may be specifically used as reference points for culling the ephemeris information used to expedite Assisted GPS location determinations.

Claims

1. A method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station, comprising:

defining an inverted cone above a reference point physically distant from a relevant mobile device;

culling said plurality of locating satellites to a culled group of locating satellites within said inverted cone above said reference point, said culled group being determined based on a dwell time of said plurality of locating satellites within said inverted cone; and

passing an identity of said culled group of locating satellites to said relevant mobile device.

2. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 1, wherein:

said reference point corresponds to a wireless base station.

3. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 2, wherein:

said reference point corresponds to a surveyed location of a cellular cell site which may be a site of an antenna or a cluster of antenna.

4. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 1, wherein:

said inverted cone is normal to Earth.

5. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 1, wherein:

said wireless base station is a cellular phone base station.

6. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 1, wherein:

said culling is performed by said mobile device.

7. The method of culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 1, wherein:

said culling is performed by said wireless base station with which said mobile device is in communication.

8. The method of culling a plurality of locating satellites into a sub-plurality for communication via a single base station according to claim 1, wherein each of said plurality of locating satellites comprise:

a Global Positioning Satellite (GPS).

9. Apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station, comprising:

means for defining an inverted cone above a reference point physically distant from a relevant mobile device;

means for culling said plurality of locating satellites to a culled group of locating satellites within said inverted cone above said reference point, said culled group being based on a dwell time of said plurality of locating satellites within said inverted cone; and

means for passing an identity of said culled group of locating satellites to said relevant mobile device.

10. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein:

said reference point corresponds to a wireless base station.

11. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 10, wherein:

said reference point corresponds to a surveyed location of a cellular cell site which may be a site of an antenna or a cluster of antenna.

12. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein:

said inverted cone is normal to Earth.

13. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein:

said wireless base station is a cellular phone base station.

14. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein:

said mobile device includes said means for culling.

15. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein:

said culling is performed by said wireless base station with which said mobile device is in communication.

16. The apparatus for culling a plurality of locating satellites into a sub-plurality for communication via a wireless base station according to claim 9, wherein each of said plurality of locating satellites comprise:

a Global Positioning Satellite (GPS).