Influence of MGEX Differential Code Bias Products on BDS-3 Pseudorange Single Point Positioning

Objectives In order to study the influence of different differential code bias (DCB) products on BDS-3 pseudorange single point positioning, the BDS-3 single-frequency and dual-frequency ionospheric-free combined pseudorange single point positioning satellite-side DCB correction model was derived.

Methods Based on two DCB products of Chinese Academy of Sciences (CAS) and Deutsches Zentrum für Luftund Raumfahrt(DLR) released by the multi-global navigation satellite system(GNSS) experiment, combined with the BDS-3 measured data from the International GNSS Service stations evenly distributed in different latitudes around the world for 7 days of B1I, B1C and B2a single frequency and B1C/B2a, B1I/B3I two commonly used ionospheric-free combined pseudorange single point positioning accuracy for comparison and analysis.

Results Experimental results show that in the three frequencies of B1I, B1C, and B2a and the two combinations of B1C/B2a and B1I/B3I, the positioning accuracy of CAS products after correction is better than that of DLR products as a whole. Specifically, the average of positioning accuracy has increased 3 cm, 1 cm, and 6 cm in the directions of E, N, and U,respectively.

Conclusions It can be concluded that for BDS-3 pseudorange single point positioning, the positioning accuracy of CAS products after correction is generally better than that of DLR products.