Ephemeris extension method for GNSS applications
First Claim
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1. A method for improving the accuracy of a receiver position, comprising:
- receiving a prediction file comprising almanac correction data and fewer than 60480 bytes;
using the almanac correction data with almanac data to produce a corrected satellite location; and
using the corrected satellite location to calculate a receiver position;
wherein the almanac correction data is usable for seven days to generate corrected satellite locations accurate to within thirty meters.
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Abstract
Systems, methods and devices for improving the performance of Global Navigation Satellite System (GNSS) receivers are disclosed. In particular, the improvement of the ability to calculate a satellite position or a receiver position where a receiver has degraded ability to receive broadcast ephemeris data directly from a GNSS satellite is disclosed. Correction terms can be applied to an approximate long-term satellite position model such as the broadcast almanac.
117 Citations
19 Claims
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1. A method for improving the accuracy of a receiver position, comprising:
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receiving a prediction file comprising almanac correction data and fewer than 60480 bytes; using the almanac correction data with almanac data to produce a corrected satellite location; and using the corrected satellite location to calculate a receiver position; wherein the almanac correction data is usable for seven days to generate corrected satellite locations accurate to within thirty meters. - View Dependent Claims (2, 3)
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4. A method for generating an extended ephemeris prediction file, comprising:
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obtaining data comprising a prediction of a satellite orbit; computing correction terms related to a difference between the prediction of a satellite orbit and a second prediction resulting from almanac data; wherein the prediction file comprises less than 60480 Bytes and is usable for seven days to generate corrected satellite locations accurate to within thirty meters. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A computer readable medium having computer code embedded therein that, when executed, would carry out a method for generating an extended ephemeris prediction file, comprising:
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obtaining data comprising a prediction of a satellite orbit; computing correction terms related to a difference between the prediction of a satellite orbit and a second prediction resulting from almanac data; wherein the prediction file comprises less than 60480 Bytes and is usable for seven days to generate corrected satellite locations accurate to within thirty meters. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A GNSS receiver, comprising:
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a communications port for receiving an almanac correction model; a memory for storing almanac data; circuitry for receiving GNSS signals; and a processor for calculating the position of the receiver based on the received GNSS signals and the position of a GNSS transmitter as calculated from almanac data and the almanac correction model; wherein the processor is configured to use the almanac correction model to generate corrected satellite locations, wherein each such location generated during a seven-day period is accurate to within thirty meters. - View Dependent Claims (19)
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Specification