LOCATION DETERMINATION IN MULTI-SYSTEM GNNS ENVIRONMENT USING CONVERSION OF DATA INTO A UNIFIED FORMAT
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United States of America Patent
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Issued Date -
Mar 12, 2015
app pub date -
Sep 12, 2013
filing date -
Sep 12, 2013
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Accurate long term satellite models for satellites include satellites of different navigation systems. Such a model is derived for a non-GPS satellite that broadcasts native orbital model data specified as valid within a first time period. Initial position and velocity data are determined from the native orbital model data, and orbit integration is performed to determine an orbital arc in an earth-centered-earth-fixed frame over a second time period longer than the first time period. Initial estimates of GPS or GPS-like orbit parameters are determined for the non-GPS satellite, and the orbital arc and the initial estimates of the GPS or GPS-like orbit parameters are input to an orbit parameter solver that determines GPS or GPS-like parameters that fit the orbital arc and is used to determine final orbital model parameters in GPS or GPS-like format for the non-GPS satellite.
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