Method and apparatus for improving the accuracy of position estimates in a satellite based navigation system
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United States of America Patent
Stats
-
Feb 14, 1995
Grant Date -
N/A
app pub date -
Dec 1, 1992
filing date -
Dec 1, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The accuracy of a vehicle position estimate generated using a satellite-based navigation system is improved by accounting for non-linear errors in the vehicle position computations. The standard navigation equation is modified to include the error coefficients .alpha., .beta., .gamma. and .delta.. .alpha. is used to model errors in the x dimension. .beta. is used to model errors in the y dimension. .gamma. is used to model errors in the z dimension. .delta. is used to model errors in the pseudoranges. The error coefficients may be computed using an open-ended GPS system or a differential GPS system. The error coefficients may be computed in real time or may be computed once and used for a period thereafter. Once computed, the error coefficients are factored into the computation of a vehicle position estimate for increased precision.
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