PREDICTION REFRESH METHOD FOR EPHEMERIS EXTENSIONS
First Claim
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1. A method for using satellite ephemeris data in a GNSS receiver, comprising:
- obtaining a synthetic ephemeris data set;
using the synthetic ephemeris data set in combination with other data to compute a position of the GNSS receiver;
updating the synthetic ephemeris data set, at a time after obtaining the synthetic ephemeris data set, using information obtained from broadcast ephemeris data.
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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.
100 Citations
20 Claims
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1. A method for using satellite ephemeris data in a GNSS receiver, comprising:
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obtaining a synthetic ephemeris data set; using the synthetic ephemeris data set in combination with other data to compute a position of the GNSS receiver; updating the synthetic ephemeris data set, at a time after obtaining the synthetic ephemeris data set, using information obtained from broadcast ephemeris data. - View Dependent Claims (2, 3, 4)
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5. A method for refreshing satellite ephemeris data, comprising:
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measuring a range to a first satellite to obtain a first pseudorange; attributing an error in the first pseudorange to a clock correction parameter of a satellite ephemeris data set; and providing for a correction of the clock correction parameter. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A GNSS receiver, comprising:
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a receiver section for receiving GNSS signals; a processor for processing data derived from GNSS signals; wherein the processor is configured to update a synthetic ephemeris data set using information obtained from broadcast ephemeris data. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification