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Computing long term orbit and clock models with variable time-horizons

  • US 7,693,660 B2
  • Filed: 02/07/2007
  • Issued: 04/06/2010
  • Est. Priority Date: 02/07/2006
  • Status: Active Grant
First Claim
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1. A method for generating time-horizons for long term orbit models for at least one satellite within a global navigation satellite system (GNSS) comprising:

  • computing a predicted orbit parameter in an orbit parameter prediction model;

    producing an indicia of accuracy by comparing the predicted orbit parameter to a current orbit parameter;

    if the indicia of accuracy indicates at least a predefined level of accuracy, setting a time-horizon for the orbit parameter prediction model at a first value; and

    if the indicia of accuracy indicates less than the predefined level of accuracy, setting the time-horizon for the orbit parameter prediction model at a second value, where the second value is less than the first value.

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