Method and apparatus for position determination with extended SPS orbit information
First Claim
1. A method of a mobile station, comprising:
- estimating predicted orbit data of a second satellite at least in part by applying correction information received at the mobile station to previous orbit data for the second satellite stored at the mobile station, wherein the correction information is represented by one or more coefficients of one or more polynomials;
combining real-time orbit data of a first satellite and the predicted orbit data of the second satellite at least in part to determine an estimated location for the mobile station;
switching from the real-time orbit data of the first satellite to predicted orbit data of the first satellite in response to the real-time orbit data of the first satellite becoming unavailable;
interpolating the real-time data of the first satellite and the predicted orbit data of the first satellite to smooth a transition between the real-time data and the predicted orbit data; and
using the predicted orbit data of the first satellite at least in part to determine the estimated location for the mobile station.
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Accused Products
Abstract
A method and system for assisting mobile stations to locate a satellite use an efficient messaging format. A server computes a correction between coarse orbit data of a satellite and precise orbit data of the satellite. A coordinate system is chosen such that variation of the correction is substantially smooth over time. The server further approximates the correction with mathematical functions to reduce the number of bits necessary for transmission to a mobile station. The mobile station, upon receiving the coefficients, evaluates the mathematical functions using the coefficients and a time of applicability (e.g., the current time), converts the evaluated result to a standard coordinate system, and applies the conversion result to the coarse orbit data to obtain the precise orbit data.
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Citations
12 Claims
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1. A method of a mobile station, comprising:
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estimating predicted orbit data of a second satellite at least in part by applying correction information received at the mobile station to previous orbit data for the second satellite stored at the mobile station, wherein the correction information is represented by one or more coefficients of one or more polynomials; combining real-time orbit data of a first satellite and the predicted orbit data of the second satellite at least in part to determine an estimated location for the mobile station; switching from the real-time orbit data of the first satellite to predicted orbit data of the first satellite in response to the real-time orbit data of the first satellite becoming unavailable; interpolating the real-time data of the first satellite and the predicted orbit data of the first satellite to smooth a transition between the real-time data and the predicted orbit data; and using the predicted orbit data of the first satellite at least in part to determine the estimated location for the mobile station. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system of a mobile station, comprising:
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a processor to estimate predicted orbit data of a second satellite at least in part by applying correction information received at the mobile station to previous orbit data for the second satellite stored in a memory of the mobile station, wherein the correction information is represented by one or more coefficients of one or more polynomials; and a combining unit to combine real-time orbit data of a first satellite with the predicted orbit data of the second satellite at least in part to determine an estimated location for the mobile station, the combining unit further to switch from the real-time orbit data of the first satellite to predicted orbit data of the first satellite in response to the real-time orbit data of the first satellite becoming unavailable, to interpolate the real-time data of the first satellite and the predicted orbit data of the first satellite to smooth a transition between the real-time data and the predicted orbit data, and to use the predicted orbit data of the first satellite at least in part to determine the estimated location for the mobile station. - View Dependent Claims (8)
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9. A mobile station, comprising:
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means for estimating predicted orbit data of a second satellite at least in part by applying correction information received at the mobile station to previous orbit data for the second satellite stored at the mobile station, wherein the correction information is represented by one or more coefficients of one or more polynomials; means for combining real-time orbit data of a first satellite and the predicted orbit data of the second satellite at least in part to determine an estimated location for the mobile station; means for switching from the real-time orbit data of the first satellite to predicted orbit data of the first satellite in response to the real-time orbit data of the first satellite becoming unavailable; means for interpolating the real-time data of the first satellite and the predicted orbit data of the first satellite to smooth a transition between the real-time data and the predicted orbit data; and means for using the predicted orbit data of the first satellite at least in part to determine the estimated location for the mobile station. - View Dependent Claims (10)
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11. An article, comprising:
- a non-transient machine-readable medium having stored thereon instructions executable by a processor of a mobile station to;
estimate predicted orbit data of a second satellite at least in part by applying correction information received at the mobile station to previous orbit data of the second satellite stored at the mobile station, wherein the correction information is represented by one or more coefficients of one or more polynomials; combine real-time orbit data of a first satellite and the predicted orbit data of the second satellite at least in part to determine an estimated location for the mobile station; switch from the real-time orbit data of the first satellite to predicted orbit data of the first satellite in response to the real-time orbit data of the first satellite becoming unavailable; interpolate the real-time data of the first satellite and the predicted orbit data of the first satellite to smooth a transition between the real-time data and the predicted orbit data; and determine the estimated location for the mobile station at least in part by using the predicted orbit data of the first satellite. - View Dependent Claims (12)
- a non-transient machine-readable medium having stored thereon instructions executable by a processor of a mobile station to;
Specification