The study presents the influence of strong total\nelectron content (TEC) fluctuations occurring at high latitudes\non rapid static positioning. The authors propose an\nalgorithm mitigating the impact of dynamic temporal\nchanges in electron content using the rate of TEC corrections.\nIt consists of modifying the observations using the\nmeasured rate of TEC variations and hence allows reducing\nthe number of parameters to one ionospheric delay of a\nreference epoch per satellite and per session. An analysis\nwas carried out for a typical quiet day in solar minimum on\nSeptember 6, 2009 and a disturbed day during high solar\nactivity on March 17, 2013. For a standard geometry-based\nrelative model with weighted ionosphere and troposphere,\nthe results confirmed the dramatic drop of ambiguity resolution\nefficiency during a violent space weather event.\nThe results obtained for the new algorithm, however,\ndemonstrate its wide applicability and a 10-fold improvement\nin ambiguity success rate during the disturbed day.
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