Abstract：In this paper, we test the algorithm of BDSBAS grid ionospheric, analyze the accuracy of the grid ionosphere correction model of BDSBAS with the high-precision grid ionospheric data as the reference value, and further study the effect of the grid ionospheric on the single-frequency positioning. The preliminary test shows that the ionospheric correction number and trend of BDSBAS broadcasted at this stage are consistent with the IGS ionospheric product, and the error is basically around 5 TECu; compared with the GPS Klobuchar model, the positioning accuracy after the correction of BDSBAS grid ionospheric model shows great improvement that reaches 30%-50%.
