Preliminary Performance Evaluation of BeiDou Global Ionospheric Delay Correction Model

The BeiDou global navigation system was officially launched in 2017 and will adopt a new BeiDou global ionospheric delay correction model(BDGIM). Using high-precision grid ionospheric data released by CODE and the Slant ionospheric delay derived from dual-frequency observations as a reference, the accuracy of the BDGIM model is analyzed and evaluated, and compared with the BeiDou Klobuchar and GPS Klobuchar models. The results show that in the region of China, the BDGIM model and the BeiDou Klobuchar model are comparable in accuracy and superior to the GPS Klobuchar model. On a global scale, the accuracy of the BDGIM model is better than that of the BeiDou Klobuchar and the GPS Klobuchar models. Different ionospheric models are implemented for single point positioning. The results show that the BDGIM model has a 13% improvement over the positioning accuracy of the BeiDou Klobuchar model, and a 7%-10% improvement over the GPS Klobuchar model.