Carrier Phase Double Differencing GNSS Receiving System with Spatial Integrity Monitoring
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United States of America Patent
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Issued Date -
Sep 7, 2017
app pub date -
Mar 7, 2016
filing date -
Mar 7, 2016
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Abstract
A method and system determines a reference receiver for carrier phase differencing in a global navigation satellite system by first receiving measurements from at least five satellites at a set of antennas of a set of receivers. Right-hand circular polarization is applied at a first subset of antennas of a first subset of receivers and left-hand circular polarization is applied at a second subset of the antennas of a second subset of receivers to produce first and second phase lock loop (PLL) outputs. Line-of-sight and non-line-of-sight detection are applied to the first and second PLL outputs to indicate a presence of multipath. Then, whether or not the first subset of receivers are affected by multipath and polarization changing impairments are output, and carrier phase double differencing is performed using carrier phase measurements to indicate which receiver is used as a reference receiver for the carrier phase double differencing.
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