METHOD AND APPARATUS FOR PROVIDING RELIABLE EXTENDED EPHEMERIS QUALITY INDICATORS
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United States of America Patent
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Issued Date -
Aug 5, 2010
app pub date -
Jan 30, 2009
filing date -
Jan 30, 2009
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Abstract
The present invention is related to location positioning systems, and more particularly, to a method and apparatus for providing reliable extended ephemeris information and indicators of quality. According to one aspect, the invention employs a concept of Approximate Accuracy Symmetry, in which a history of broadcast ephemerides is logged for each satellite, and used as a reference to evaluate the potential accuracy of the predicted orbit for each satellite in the future. According to further aspects, the desired accuracy information for the extended ephemerides can be reliably provided in advance.
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