Abstract:This paper first analyzes the accuracy and stabilities of multi-GNSS experiment (MGEX) BDS DCB. It then performs a comprehensive analysis of the difference of daily and weekly DCB, as well as computer noise components and parameters of the BDS DCB. The results indicate that the IGSO DCB is the best, followed by MEO, while the last is GEO. The accuracy and stability of DCBB1B2 is better than the others, DCBB2B3 is the worst. A large amount of experimental data shows that the noise component of BDS is mainly Gaussian white noise (WN) as well as first order Gauss-Markov (GM) process noise. The DCB WN is 0.16 ns, 0.15 ns, 0.09 ns; the GM process noise is 0.093 ns/d, 0.049 ns/d, 0.058 ns/d, and the correlation time is 42.63 d, 85.79 d, 42.63 d.