Methods and apparatuses for multipath estimation and correction in GNSS navigation systems
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United States of America Patent
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Aug 23, 2016
Grant Date -
Dec 5, 2013
app pub date -
May 30, 2012
filing date -
May 30, 2012
priority date (Note) -
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Abstract
The present invention relates generally to methods and apparatuses for estimating and correcting for multipath in GNSS navigation systems. According to some aspects, the invention operates in situations where position and estimated position error are reasonably stable so as to detect when large multipath errors are present with confidence. After detection, the slowly varying biases from multipath or other un-modeled sources can be modeled separately from the navigation state. The measurements are kept in the solution without biasing the navigation state thereby ignoring the long-term biases for use over short-term periods with minimized pseudorange error when necessary.
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