Preliminary Performance Evaluation of BeiDou Global Ionospheric Delay Correction Model
(2.Beijing Institute of Tracking and Telecommunication Technology, Beijing, China 100094)
(3.Institute of Surveying and Mapping, Information Engineering University, Zhengzhou, Henan Province, China 450002)
【Abstract】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 ionospheric delay derived from dual-frequency observations as a reference, we analyzed and evaluated the accuracy of the BDGIM model and compared it with that of 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.
【Keywords】 BeiDou-3; BDGIM; BeiDou Klobuchar; GPS Klobuchar; single point positioning;
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