Global positioning system signal acquisition assistance
First Claim
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1. A method of determining a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal of wireless communications network when acquiring a signal from a satellite of a satellite positioning system, including:
- determining an approximate position of the satellite positioning system receiver having an non-circular position uncertainty region associated therewith;
determining a minimum range to the satellite for a mobile terminal within the position uncertainty region;
determining a maximum range to the satellite for a mobile terminal within the position uncertainty region;
determining a code phase search window for use by the satellite positioning system receiver that includes a code phase interval encompassing code phase values corresponding to the minimum and maximum ranges to the satellite.
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Abstract
There is disclosed a method of determining a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal of a communications network when acquiring a signal from a satellite of a satellite positioning system.
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Citations
55 Claims
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1. A method of determining a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal of wireless communications network when acquiring a signal from a satellite of a satellite positioning system, including:
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determining an approximate position of the satellite positioning system receiver having an non-circular position uncertainty region associated therewith;
determining a minimum range to the satellite for a mobile terminal within the position uncertainty region;
determining a maximum range to the satellite for a mobile terminal within the position uncertainty region;
determining a code phase search window for use by the satellite positioning system receiver that includes a code phase interval encompassing code phase values corresponding to the minimum and maximum ranges to the satellite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, in a satellite positioning system receiver associated with a mobile terminal of a wireless communications network, of determining a code phase offset between a locally generated encoded signal and an encoded signal received from a satellite of the satellite positioning system, the method comprising:
comparing the phase of the locally generated encoded signal to the received signal for a plurality of the code phase offsets in a code phase search window until a phase match is identified, wherein the code phase search window is determined on the basis of an approximate position of the satellite positioning system receiver and an associated a non-circular position uncertainty region and is representative of a range of possible code phase offsets for a terminal located in said non-circular position uncertainty region. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of assisting a satellite positioning system receiver associated with a mobile terminal operating in a wireless communications network to determine a code phase offset between an encoded signal generated in the receiver and an encoded signal received from a satellite of the satellite positioning system, the method including:
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determining, on the basis of an approximate position of the mobile terminal and an associated a non-circular uncertainty region, a code phase search window; and
communicating the determined code phase search window to the receiver. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A network element of a communications network configured to determine a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal operating within the communications network, wherein the network element is configured to determine a code phase search window on the basis of:
an approximate position assigned to the satellite positioning system receiver having a non-circular position uncertainty region associated wherewith. - View Dependent Claims (36, 37, 42, 43)
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38. A network element of a communications network including;
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a processor configured to determine a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal operating within the communications network, the processor being configured to determine a code phase search window on the basis of;
an approximate position assigned to the satellite positioning system receiver;
a non-circular position uncertainty region associated with the approximate position; and
transmission means configured to transmit data representative of the code phase search window to the mobile terminal via the communications network. - View Dependent Claims (39, 40, 41, 44, 45)
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- 46. A method of determining a code phase search window for use by a satellite positioning system receiver associated with a mobile terminal of wireless communications network when acquiring a signal from a satellite of a satellite positioning system, wherein the code phase search window is determined based on an approximate position of the satellite positioning system receiver and an associated non-circular uncertainty region surrounding the approximate position.
Specification