System and method for using data phase to reduce position ambiguities

1. A method, comprising:

identifying a range intersection curve, said range intersection curve representing a first arc on the surface of the earth that is defined by a known position of a communication satellite and a first range distance;

identifying a code/data phase intersection curve, said code/data phase intersection curve representing a second arc on the surface of the earth that is defined by a known position of a GPS satellite and a second range distance that is consistent with a code phase measurement and a data phase measurement of a GPS satellite signal;

identifying an initial position point based on a determined intersection point between said range intersection curve and said code/data phase intersection curve; and

determining a final position of said mobile terminal using said initial position point.

2. The method of claim 1 , wherein said initial position point is said determined intersection point.

3. The method of claim 1 , wherein said determining a final position comprises determining using a plurality of code phase measurements for a respective plurality of GPS signals.

4. The method of claim 1 , wherein said determining a final position comprises determining using a plurality of code phase measurements for a respective plurality of GPS signals and at least one data phase measurement for a GPS signal.

5. The method of claim 1 , wherein said determining a final position comprises performing an iterative calculation process.

6. The method of claim 5 , wherein said iterative calculation process is performed on only said initial position point.

7. A method, comprising:

determining an initial position point using a code phase measurement and a data phase measurement, said determining using a code/data phase intersection curve that represents an arc on the surface of the earth that is defined by a known position of a GPS satellite and a range distance that is consistent with said code phase measurement and said data phase measurement; and

performing an iterative calculation process on said initial position point to produce a final position solution for a mobile terminal.

8. The method of claim 7 , further comprising receiving said code phase measurement and said data phase measurement via a communication satellite.

9. The method of claim 8 , wherein said determining comprises determining using a range intersection curve based on a determined range from said mobile terminal to said communication satellite.

10. The method of claim 9 , wherein said initial position point is on said range intersection curve.

11. The method of claim 7 , wherein said performing comprises performing on only said initial position point.

12. A method, comprising:

determining an initial position point using a code phase measurement and a data phase measurement of a GPS satellite signal, said initial position point being determined using a range intersection curve that represents an arc on the surface of the earth, said arc being defined by a known position of a communication satellite and a range distance from said communication satellite to a mobile terminal, wherein said initial position point on said range intersection curve is consistent with said code phase measurement and said data phase measurement; and

performing an iterative calculation process on said initial position point to produce a final position solution for said mobile terminal.

13. The method of claim 12 , further comprising receiving said code phase measurement and said data phase measurement via a communication satellite.

14. The method of claim 12 , wherein said performing comprises performing on only said initial position point.