Method and apparatus for maintaining integrity of long-term orbits in a remote receiver
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United States of America Patent
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Feb 24, 2015
Grant Date -
Oct 31, 2013
app pub date -
Jun 21, 2013
filing date -
Nov 17, 2000
priority date (Note) -
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Abstract
A method and apparatus for maintaining integrity of long-term-orbit information used by a Global-Navigation-Satellite-System or other positioning receiver is described. The method comprises obtaining a predicted pseudorange from a first set of long-term-orbit information possessed by a positioning receiver; obtaining, at the positioning receiver from at least one satellite, a measured pseudorange; determining validity of the predicted pseudorange as a function of the predicted pseudorange and the measured pseudorange; and excluding from the long-term-orbit information at least a portion thereof when the validity of the predicted pseudorange is deemed invalid. Optionally, the method may comprise updating or otherwise supplementing the long-term-orbit information with other orbit information if the validity of the predicted pseudorange is deemed invalid.
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