【摘 要】
：
Ionospheric delay is an important source of error in the positioning of the Global Navigation Satellite System(GNSS).In the case of active ionosphere,the io
【机 构】
：
GNSS Research Center of Wuhan University,430079 Wuhan,China
论文部分内容阅读
Ionospheric delay is an important source of error in the positioning of the Global Navigation Satellite System(GNSS).In the case of active ionosphere,the ionospheric delay can be over 100 meters,which has a great impact on the positioning accuracy of single-frequency GNSS users.At present,ionospheric observations based on dual-frequency carrier phase smoothed pseudorange are frequently used to estimate the ionospheric model,however,the ionospheric observations are susceptible to the precision of the pseudorange,the length of the smoothing arc and the multipath,which affect the accuracy of the estimated ionospheric model.In this paper,the UofC model of the precise point positioning is proposed for estimating carrier phase ambiguity to obtain high precision ionospheric observations.The IGS global tracking network data are combined to solve the problem of strong correlation in differential code bias(DCB)of the regional station receivers.A regional ionospheric model based on satellites was established considering the precision loss of the fitting of the ionospheric single-layer model in small area.
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