Abstract:Firstly, based on the influence of multipath delay, we modify the BDS-3 pseudo range observation data epoch by epoch, and then estimate and analyze the 11 types of DCBs of BDS-3 new frequency points using the corrected observation data for a month in succession. Finally, we compare the impact of estimated DCB products and DCB products provided by CAS on PPP. The results show that: 1) There is almost no multipath deviation related to altitude angle in the multipath delay of BDS-3, and the multipath delay is 0 to 1 ns. 2) The deviation between the DCB estimation result and CAS is 0.1 ns, the closure error of the three types of DCB is within 0.2 ns, and the STD value of the estimated value is equivalent to CAS, which is more stable than DLR. 3) In PPP, the DCB products estimated in this paper and the products provided by CAS for different measuring stations have roughly the same precision.