An accurate Kriging-based regional ionospheric model using combined GPS/BeiDou observations

作者：Abdelazeem Mohamed; Celik Rahmi N; El Rabbany Ahmed

来源：Journal of Applied Geodesy, 2018, 12(1): 65-76.

DOI：10.1515/jag-2017-0023

<jats:title>Abstract</jats:title>
<jats:p>In this study, we propose a regional ionospheric model (RIM) based on both of the GPS-only and the combined GPS/BeiDou observations for single-frequency precise point positioning (SF-PPP) users in Europe. GPS/BeiDou observations from 16 reference stations are processed in the zero-difference mode. A least-squares algorithm is developed to determine the vertical total electron content (VTEC) bi-linear function parameters for a 15-minute time interval. The Kriging interpolation method is used to estimate the VTEC values at a 1 ° × 1 ° grid. The resulting RIMs are validated for PPP applications using GNSS observations from another set of stations. The SF-PPP accuracy and convergence time obtained through the proposed RIMs are computed and compared with those obtained through the international GNSS service global ionospheric maps (IGS-GIM). The results show that the RIMs speed up the convergence time and enhance the overall positioning accuracy in comparison with the IGS-GIM model, particularly the combined GPS/BeiDou-based model.</jats:p>

• 出版日期2018-1