  Within the Multi-GNSS Pilot Project (MGEX) of the International GNSS Service
(IGS), precise orbit and clock products for the BeiDou-3 global navigation
satellite system (BDS-3) are routinely generated by a total of five analysis
centers. The processing standards and specific properties of the individual
products are reviewed and the BDS-3 orbit and clock product performance is
assessed through direct inter-comparison, satellite laser ranging (SLR)
residuals, clock stability analysis, and precise point positioning solutions.
The orbit consistency evaluated by the signal-in-space range error is on the
level of 4-8 cm for the medium Earth orbit satellites whereas SLR residuals
have RMS values between 3 and 9 cm. The clock analysis reveals sytematic
effects related to the elevation of the Sun above the orbital plane for all ACs
pointing to deficiencies in solar radiation pressure modeling. Nevertheless,
precise point positioning with the BDS-3 MGEX orbit and clock products results
in 3D RMS values between 7 and 8 mm.
