Abstract:Based on the precise ephemeris and clock product, we evaluate the orbit accuracy, clock accuracy and 3 kinds of signals in space ranging error(SISRE) of BDS-3 broadcast ephemeris. The results show that the broadcast orbit accuracy of BDS-3 satellites is obviously better than that of BDS-2 satellites. Radial RMS accuracy of BDS-3 satellites is better than 0.18 m, along-track and cross-track RMS accuracy is better than 0.6 m. The broadcast clock errors of BDS-3 satellites are maintained within 5 ns and are more stable than those of BDS-2. The RMS and 95% statistical accuracy of BDS-3 broadcast clock errors are 1.86 ns and 3.23 ns respectively, which are better than that of BDS-2 satellites. The RMS statistical accuracy of orbit-only SISRE, global-average SISRE and worst SISRE of BDS-3 satellites are 0.12 m, 0.58 m and 0.60 m respectively and the corresponding 95% statistical accuracy are 0.22 m, 0.99 m and 1.02 m, and both of them are significantly better than BDS-2.