Method and system for extending the usability period of long term orbit (LTO)
Aspects of a method and system for extending the usability period of long term orbit (LTO) are provided. A GPS enabled handset may receive LTO data from an AGPS server via a wireless communication network such as 3GPP or WiMAX. The GPS enabled handset may be enabled to receive broadcast GPS signals. The GPS enabled handset may extract navigation information from the received broadcast GPS signals to be used to adjust the received LTO data. The usability period of the received LTO data may be extended, accordingly. A clock model and a satellite health model associated with the extracted navigation information may be used to update or replace the clock model and/or the satellite health model of the received LTO data, respectively. A navigation solution for the GPS enabled handset may be determined more accurately based on the adjusted LTO data.
1. A method for wireless communication, the method comprising:
receiving, from a server configured to provide assistance data, satellite tracking data at a remote receiver, wherein the satellite tracking data comprises one or more ephemeris models;
receiving, directly from a satellite, a satellite broadcast signal at said remote receiver; and
adjusting a model of said satellite tracking data based on said received satellite broadcast signal to extend the usability period of said model.
2. The method according to claim 1 , comprising receiving, at said remote receiver, said satellite tracking data via one or more of a 3GPP signal, a 3GPP Long Term Evolution (LTE) signal, and a WiMAX signal.
3. The method according to claim 1 , comprising extracting navigation information from said received satellite broadcast signal.
4. The method according to claim 3 , comprising extending a usability period of said model of said satellite tracking data based on said extracted navigation information.
5. The method according to claim 3 , wherein said extracted navigation information comprises satellite ephemeris and satellite health information.
6. The method according to claim 5 , comprising adjusting said model of said satellite tracking data based on said satellite ephemeris.
7. The method according to claim 5 , comprising adjusting said model of said satellite tracking data based on said satellite health information.
8. The method according to claim 5 , comprising updating a clock model of said satellite tracking data based on said satellite ephemeris.
9. The method according to claim 5 , comprising updating a satellite health model of said satellite tracking data based on said satellite health information.
10. The method according to claim 1 , comprising determining a position fix based on said adjusted model of said satellite tracking data.
11. A system for wireless communication, the system comprising:
one or more processors operable to receive from a server configured to provide assistance data, satellite tracking data, wherein the satellite tracking data comprises one or more ephemeris models;
said one or more processors are operable to receive, directly from a satellite a satellite broadcast signal; and
said one or more processors are operable to adjust a model of said satellite tracking data based on said received satellite broadcast signal to extend a usability period of said model.
12. The system according to claim 11 , wherein said one or more processors are operable to receive said satellite tracking data via one or more of a 3GPP signal, a 3GPP Long Term Evolution (LTE) signal, and a WiMAX signal.
13. The system according to claim 11 , wherein said one or more processors are operable to extract navigation information from said received satellite broadcast signal.
14. The system according to claim 13 , wherein said one or more processors are operable to extend a usability period of said model of said satellite tracking data based on said extracted navigation information.
15. The system according to claim 13 , wherein said extracted navigation information comprises satellite ephemeris and satellite health information.
16. The system according to claim 15 , wherein said one or more processors are operable to adjust said model of said satellite tracking data based on said satellite ephemeris.
17. The system according to claim 15 , wherein said one or more processors are operable to adjust said model of said satellite tracking data based on said satellite health information.
18. The system according to claim 15 , wherein said one or more processors are operable to update a clock model of said satellite tracking data based on said satellite ephemeris.
19. The system according to claim 15 , wherein said one or more processors are operable to update a satellite health model of said satellite tracking data based on said satellite health information.
20. The system according to claim 11 , wherein said one or more processors are operable to determine a position fix based on said adjusted model of said satellite tracking data.