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


Abdelazeem M., Çelik R. N. , El-Rabbany A.

JOURNAL OF APPLIED GEODESY, cilt.12, ss.65-76, 2018 (ESCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 12 Konu: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1515/jag-2017-0023
  • Dergi Adı: JOURNAL OF APPLIED GEODESY
  • Sayfa Sayıları: ss.65-76

Özet

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 degrees x 1 degrees 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.