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US 2011/0032147 A1Published application
Providing ephemeris data and clock corrections to a satellite navigation system receiver
OwnerSai VENKATRAMAN, Janne JARPENVAA +1inventors
InventorsSai VENKATRAMAN, Janne JARPENVAA, Qinfang SUN
Life of this patent
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Abstract
A device can access scaled values and scaling factors, which are used to convert the scaled values into coefficients and residuals. The coefficients and residuals can in turn be used with time-dependent functions to reconstruct predicted ephemeris data, including clock correction data, for satellite navigation system satellites. Ephemeris data that is broadcast from any of the satellites can be used to update the calculated ephemeris data.
Claims24
A method of processing satellite navigation system data, said method comprising:
- deriving predicted ephemeris data for a plurality of satellites using predicted positions of said satellites at selected times;
- representing a parameter of said predicted ephemeris data as a first function of time;
- converting i) coefficients of said first function into respective first scaled values and ii) residuals representing differences between said predicted ephemeris data and values calculated using said first function into second scaled values, said converting performed with standardized scaling factors accessible to a receiving device;
- and
- storing said first scaled values and said second scaled values in a computer-readable memory.
2 more elements
A system comprising:
- a processor;
- and
- a memory coupled to said processor, said memory having stored therein computer-executable instructions that when executed cause said system to:
- derive predicted ephemeris data for a plurality of satellites using predicted positions of said satellites at selected times;
- represent a parameter of said predicted ephemeris data as a first function of time;
- convert coefficients of said first function into respective first scaled values;
- and convert residuals representing differences between said predicted ephemeris data and values calculated using said first function into second scaled values, wherein said coefficients and residuals are converted using known scaling factors that reside in said memory.
4 more elements
A system comprising:
- a processor;
- and
- a memory coupled to said processor, said memory having stored therein computer-executable instructions that when executed cause said system to:
- access a binary file comprising first scaled values and second scaled values;
- access scaling factors;
- and convert said first scaled values into coefficients and said second scaled values into residuals using said scaling factors, wherein said coefficients and residuals are useable with a time-dependent function to reconstruct predicted ephemeris data for a plurality of satellites.
3 more elements
Dependencies are inferred from the claim text.