Prediction refresh method for ephemeris extensions
First Claim
Patent Images
1. A method comprising:
- obtaining, by an end user GNSS receiver, a broadcast ephemeris data set associated with a GNSS;
obtaining, by the end user GNSS receiver, a current position;
measuring, by the end user GNSS receiver, a range to a first satellite to obtain a first pseudorange;
calculating, by the end user GNSS receiver, based on a synthetic ephemeris data set for a second satellite, a range to the second satellite to obtain a second pseudorange;
attributing, by the end user GNSS receiver, error in the second pseudorange only to clock error in the synthetic ephemeris data set; and
determining, by the end user GNSS receiver, a clock correction for the synthetic ephemeris data set based, at least in part, on a difference-based relationship associated with the first pseudorange and the second pseudorange.
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Abstract
Systems, methods and devices for using ephemeris data in GNSS receivers and systems are provided. Receivers using synthetic ephemeris data for longer ephemeris availability under poor reception conditions are updated using a variety of techniques that allow for the transfer of accurate information onto degraded synthetic ephemeris information.
68 Citations
18 Claims
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1. A method comprising:
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obtaining, by an end user GNSS receiver, a broadcast ephemeris data set associated with a GNSS; obtaining, by the end user GNSS receiver, a current position; measuring, by the end user GNSS receiver, a range to a first satellite to obtain a first pseudorange; calculating, by the end user GNSS receiver, based on a synthetic ephemeris data set for a second satellite, a range to the second satellite to obtain a second pseudorange; attributing, by the end user GNSS receiver, error in the second pseudorange only to clock error in the synthetic ephemeris data set; and determining, by the end user GNSS receiver, a clock correction for the synthetic ephemeris data set based, at least in part, on a difference-based relationship associated with the first pseudorange and the second pseudorange. - View Dependent Claims (2, 3, 4, 10, 11, 12)
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5. An apparatus comprising:
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a receiver section configured to receive GNSS signals; and a processor configured to; obtain a broadcast ephemeris data set associated with a GNSS; obtain a current position; measure a range to a first satellite to obtain a first pseudorange; calculate, based on a synthetic ephemeris data set for a second satellite, a range to the second satellite to obtain a second pseudorange; attribute error in the second pseudorange only to clock error in the synthetic ephermeris data set; and determine a clock correction for the synthetic ephemeris data set based, at least in part, on a difference-based relationship associated with the first pseudorange and the second pseudorange. - View Dependent Claims (13, 14, 15)
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6. An apparatus comprising:
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means for obtaining a broadcast ephemeris data set associated with a GNSS; means for obtaining a current position; means for measuring a range to a first satellite to obtain a first pseudorange; means for calculating, based on a synthetic ephemeris data set for a second satellite, a range to the second satellite to obtain a second pseudorange; means for attributing error in the second pseudorange only to a clock error in the synthetic ephemeris data set; and means for determining a clock correction for the synthetic ephemeris data set based, at least in part, on a difference-based relationship associated with the first pseudorange and the second pseudorange. - View Dependent Claims (7, 8, 9, 16, 17, 18)
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Specification