Abstract
Carrier phase multipath caused by signal reflections in the vicinity of GNSS stations is a ma- jor error source of precise differential positioning. Detection and mitigation of carrier phase multipath errors can be based on signal quality values (e. g. signal-to-noise ratio values) as provided by GNSS re- ceivers. These values are influenced by various fac- tors as e. g.the actual strength of the transmitted sig- nal, space loss, atmospheric effects, and antenna gain pattern. After their removal, deviations from nominal signal quality values mainly contain multipath infor- mation which can be used to calculate carrier phase multipath corrections. The described technique is valid only for observations collected in static mode and sin- gle dominant reflectors. Practical experiences show that corrections based on signal quality observations are able to remove a large portion of the carrier phase multipath errors.
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