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US 8,558,737 B2Granted
System and method for using data phase to reduce position ambiguities
AssigneeSkyBitz, Inc.
InventorJohn W. Brosius, III
Life of this patent
Estimating the term…
Abstract
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.
Claims14
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 more elements
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.
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.
Dependencies are inferred from the claim text.