???BDS/GPS/GLONASS????????????????о?

???BDS/GPS/GLONASS????,?????????λ???α?????????г????????????????????????????????????????顣???????????????????????IGS???????????????????????????4 TECu?????????0.675 TECu????JP2???????GNSS???TEC?????????????5 TECu????????????????????????????????????????????????????,GPS????????GLONASS????BDS??????

Research of the Characteristics of Inversing Global Ionospheric with Fusing of BDS,GPS and GLONASS

The model of ionospheric delay correction is established by fusing BDS, GPS and GLONASS with observations of pseudo distance smoothed by carrier phase and spherical harmonics. Some experiments of inversion of the global ionosphere have been done. The fusion of the three systems not only increases the number of satellites in observation, but also improves the geometric distribution of the puncture point. We fused the variation process of ionospheric daily in October, 2013 to obtain the monthly comprehensive differential code bias product and analyzed the accuracy of the products. The analysis result shows that: the ionospheric grid differs from product of IAACs within 4 TECu, mean 0.675 TECu. Furthermore, compared with the measured TEC by GNSS from reference station, the mean of the difference is less than 5 TECu. In addition, the outside precision and stability analysis of the monthly comprehensive differential code bias product indicates that the precision of GPS is better than GLONASS, while the stability of BDS is poor.