System and method for using data phase to reduce position ambiguities
View Patent ↗A geographic tracking system with minimal power and size required at the mobile terminal collects observation data at the mobile terminal and forwards the data to a processor, which calculates the position. The mobile terminal is configured to measure both code phase and data phase of a GPS satellite signal. The code phase and data phase information enables the processor to reduce the number of candidate points to be considered.
1. A method, comprising:
identifying an initial position point on a range intersection curve that is consistent with a code phase measurement and a data phase measurement of a positioning satellite signal that is taken by a mobile terminal; and
performing an iterative calculation process on the initial position point to produce a final position solution for the mobile terminal.
2. The method of claim 1 , wherein the determining is performed by a service operation center.
3. The method of claim 2 , wherein the code phase measurement and the data phase measurement are provided to the service operation center using a communication satellite transmission by the mobile terminal.
4. The method of claim 1 , wherein the performing comprises performing using a plurality of code phase measurements for a respective plurality of positioning satellite signals.
5. The method of claim 1 , wherein the positing satellite signal is a GPS satellite signal.
6. The method of claim 1 , wherein the performing comprises performing on only the initial position point.
7. The method of claim 1 , wherein the initial position point is on the range intersection curve.
8. A system, comprising:
one or more circuits that enable determination of a location of a mobile terminal, the one or more circuits being operable to:
identify an initial position point on a range intersection curve that is consistent with a code phase measurement and a data phase measurement of a positioning satellite signal that is taken by the mobile terminal; and
perform an iterative calculation process on the initial position point to produce a final position solution for the mobile terminal.
9. The system of claim 8 , wherein the code phase measurement and the data phase measurement are provided to the system using a communication satellite transmission by the mobile terminal.
10. The system of claim 8 , wherein the one or more circuits are configured to perform the iterative calculation process using a plurality of code phase measurements for a respective plurality of positioning satellite signals.
11. The system of claim 8 , wherein the positing satellite signal is a GPS satellite signal.
12. The system of claim 8 , wherein the one or more circuits are configured to perform the iterative calculation process on only the initial position point.
13. The system of claim 8 , wherein the initial position point is on the range intersection curve.
14. A non-transitory machine-readable storage having stored thereon, a computer program having at least one code section for determining a location of a mobile terminal, the at least one code section being executable by a machine for causing the machine to perform steps comprising:
identifying an initial position point on a range intersection curve that is consistent with a code phase measurement and a data phase measurement of a positioning satellite signal that is taken by the mobile terminal; and
performing an iterative calculation process on the initial position point to produce a final position solution for the mobile terminal.
15. The non-transitory machine-readable storage of claim 14 , wherein the code phase measurement and the data phase measurement are provided using a communication satellite transmission by the mobile terminal.
16. The non-transitory machine-readable storage of claim 14 , wherein the performing comprises performing using a plurality of code phase measurements for a respective plurality of positioning satellite signals.
17. The non-transitory machine-readable storage of claim 14 , wherein the positing satellite signal is a GPS satellite signal.
18. The non-transitory machine-readable storage of claim 14 , wherein the performing comprises performing on only the initial position point.
19. The non-transitory machine-readable storage of claim 14 , wherein the initial position point is on the range intersection curve.
20. The non-transitory machine-readable storage of claim 14 , wherein the identifying comprises identifying using a second intersection curve that is identified using the code phase measurement and the data phase measurement.