METHOD AND APPARATUS FOR RECONSTRUCTING TIME OF TRANSMIT FROM ASSISTED OR WEAK SIGNAL GPS OBSERVATIONS
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United States of America Patent
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Issued Date -
Feb 1, 2007
app pub date -
Jul 28, 2006
filing date -
Jul 29, 2005
priority date (Note) -
Abandoned
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Abstract
The invention provides a GPS device that resolves timing errors as applicable to an AGPS navigation solution. A single state algorithm provides rapid convergence, typical with standard Newton-Raphson performance. Problems due to ill-conditioning of the input matrix are identified by an augmented DOP calculation procedure, which may be used to identify unreliable results or to estimate the errors for those results.
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